scholarly journals Продуктивные качества коров разных генотипов

2019 ◽  
pp. 32-36
Author(s):  
O.V. Filinskaya ◽  
L.Yu. Gerasimova
Keyword(s):  
Dairy Cattle ◽  
Milk Fat ◽  
Protein A ◽  
Live Weight ◽  
Holstein Breed ◽  
The Third ◽  
Weight Content ◽  
Significant Difference ◽  
Productive Potential ◽  
Regular Increase

Продуктивный потенциал молочного скота создаётся, поддерживается и обновляется селекцией. Племенные и продуктивные качества молочного скота обусловлены генотипом животных, влиянием методов разведения и селекции. Наиболее важными селекционнохозяйственными признаками молочного скота являются: надой, массовая доля жира и белка в молоке, живая масса. Селекция в стаде должна быть направлена на отбор лучших животных по молочной продуктивности и качеству молока, так как от этого зависит выход молочной продукции. Исследованиями, проведёнными на коровах разных генотипов (чистопородной ярославской, чистопородной голштинской, помесных кровностью 50, 75 и 88 по голштинской породе), было установлено, что голштинские первотёлки и помесные достоверно превосходят по надою ярославских сверстниц на 47,3 44,5 37,5 37,5 соответственно. По процентному содержанию жира и белка достоверная разница между группами наблюдается в пользу ярославских сверстниц. Голштинские и помесные коровы обладают наибольшим выходом молочного жира и белка и их суммарным количеством. С увеличением возраста животных происходит закономерный рост молочной продуктивности коров. При этом жирномолочность к третьей лактации также возрастает по всем группам коров. В результате того, что чистопородные голштинские животные и помесные более крупные и высокомолочные, то они закономерно отличаются от ярославских коров по суммарному количеству жира и белка, коэффициенту молочности и жиробелковому коэффициенту. Была отмечена тесная достоверная взаимосвязь по первой лактации между содержанием жира и белка у коров всех групп, аналогичная картина наблюдается и по третьей лактации, только с более низкими значениями.The productive potential of dairy cattle is created, maintained and renewed by selection. The breeding and productive abilities of dairy cattle are due to the genotype of animals, the influence of breeding and selection methods. The most important selection and economic characteristics of dairy cattle are milk yield, weight content of fat and protein in milk, live weight. Selection in a herd should be aimed at selecting the best animals for milk production and milk quality as the yield of dairy products depends on it. Researches carried out on cows of different genotypes (purebred Yaroslavskaya, purebred Holstein, crossbred with blood of 50, 75 and 88 for Holstein breed), it was found that the Holstein firstcalf heifer and crossbred reliably exceled the Yaroslavl herdmates by the yield by 47.3 44.5 37.5 37.5 respectively. In terms of the percentage of fat and protein a significant difference between the groups is observed in favor of Yaroslavl herdmates. Holstein and crossbred cows have the highest yield of milk fat and protein and their total amount. With an increase in the age of animals a regular increase in the milk productivity of cows occurs. At the same time butterfat percentage to the third lactation also increases in all groups of cows. As a result of the fact that purebred Holstein animals and crossbred are larger and good milkers they naturally differ from the Yaroslavl cows in total amount of fat and protein, milking capacity ratio and fatprotein ratio. A close reliable correlation in the first lactation between the fat and protein content in cows of all groups was observed, a similar pattern is observed in the third lactation only with lower values.

scholarly journals The genesis of the ukrainian red dairy breed

2017 ◽  
Vol 19 (74) ◽  
Author(s):  
N. P. Shevchuk
Keyword(s):  
Dairy Cattle ◽  
Milk Yield ◽  
Milk Fat ◽  
Second Phase ◽  
Holstein Breed ◽  
The Third ◽  
Third Phase ◽  
Increase Milk Production ◽  
High Level ◽  
Dairy Breed

For further improvement of livestock of the Ukrainian Red Dairy Breed it is important to study the genesis because this kind of cow is breed in many farms. Evaluation of the genesis of the breed was done step by step according to the results of crossing red steppe cattle with Angler’s bulls, Red Danish and Holstein breeds. For the research it has been used methods of retrospective analysis and variation statistics. It has been found that the breeding of the Ukrainian Red Diary Breed was done during five stages which have certain characteristics. During the first stage it was carried accumulation of breeding material using Angler breeders in herds of red steppe cattle. During the second phase of creating the breed it has been received a sufficient number of animals with different proportions of blood by Angler and Danish red breeds. According to the standard target average milk yield of cows of the Ukrainian Red dairy cattle is 4000 kg. The specialty of the third phase of breeding was the use of the gene pool of the Holstein breed as the most dairy productive caw. This helped to create intensive Holstein dairy type of the Ukrainian Red dairy breed. The average productivity of firstborn cows with different proportions of blood in Holstein red spoted breed is 5038–5638 kg of milk with fat in it up to 3.78–3.93%. The fourth step is completed with butterfat intrabreed and holshtynised types of Ukrainian dairy cattle and conducted their testing. At the fifth stage the work of heredity consolidation of newly formed breed is held and continues crossbreeding with Holstein breed bulls red spotted colour to increase milk production. Thus, animals of the Ukrainian Red Dairy Breed are characterized by a high level of productivity. At the farm «Colos 2011» in Mykolaiv region the milk yield of cows during 305 days and the third lactation is over 8565 kg of milk, the quantity of milk fat is 332 kg.

Milk productivity of the cows of Holstein and Simmental breeds in environment of the Novosibirsk region

2020 ◽  
pp. 41-49 ◽  
Author(s):  
A. Zheltikov ◽  
N. Kostomakhin ◽  
D. Adushinov ◽  
O. Zaiko ◽  
V. Dementev ◽  
...  
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Milk Fat ◽  
Correlation Coefficients ◽  
Live Weight ◽  
Fat Content ◽  
Milk Productivity ◽  
Holstein Breed ◽  
Novosibirsk Region ◽  
Daily Milk Yield

The characteristic of milk productivity of cows of Holstein and Simmental breeds in LLC “Sibirskaya Niva” in the Maslyaninsky district in the Novosibirsk region has been given. It has been revealed that under the natural and climatic environments of the Western Siberia, when creating favorable conditions for feeding and housing for cows of Holstein and Simmental breeds have sufficiently high milk productivity. It has been found that Holstein first-calf heifers surpassed their Simmental herdmates by 959 kg in milk yield for the first 305 days of lactation under the same conditions of housing and feeding, by 3,1 kg in daily milk yield, by 38,2 kg in milk fat yield, and by 28,3 kg in milk protein yield (P < 0,001). There were no statistically significant differences between animals of Holstein and Simmental breeds in terms of fat and protein content in milk, which amounted to 3,94 and 2,96 % in Holstein breed and 3,97 and 2,98 % in Simmental breed, respectively. Both breeds have shown high milk productivity during the first 3 lactations. Thus, the milk yield of Holstein cows for the first 3 lactation was 6475–9290 kg, Simmental cows it was 5516–7680 kg, fat content was 3,93–3,99 and 3,96–3,97 %, respectively. The protein content in the milk of cows of both breeds did not exceed 3,0 %. High variability has been found in milk yield, yield of milk fat and protein, the coefficient of milk content and duration of lactation, the lowest in the content of protein and fat in milk and live weight. The correlation coefficients between the fat and protein content in milk were generally positive, but did not exceed 0,28. Therefore, breeding in the herd of cows in LLC “Sibirskaya Niva” have to be conducted not only by fat content, but also by protein content in milk.

scholarly journals Influence of Genotype and Intensity of Cows’ Formation on the Level of their Lactation performance

2021 ◽  
pp. 19-23
Author(s):  
Т.В. Павлова ◽  
Н.Н. Шамич ◽  
В.А. Бельцов
Keyword(s):  
Milk Fat ◽  
Live Weight ◽  
Weight Fraction ◽  
Average Yield ◽  
Lactation Performance ◽  
Black And White ◽  
Holstein Breed ◽  
White Breed ◽  
The Republic ◽  
Protein Milk

Цель работы – установить влияние генотипа и интенсивности формирования коров на уровень их молочной продуктивности в одном из предприятий Минской области Республики Беларусь. Объектом исследований являлись 940 коров белорусской чёрно-пёстрой породы с разной долей генотипа по голштинской породе. Для проведения группировки коров по генотипам у каждого животного определяли линейную принадлежность, породность по голштинской породе и страну селекции отца. При оценке молочной продуктивности коров учитывались следующие показатели: удой за 305 дней первой и последней законченной лактации; массовая доля жира, %; массовая доля белка, %; выход молочного жира и белка, кг. Установлено, что с увеличением породности по голштинской породе у коров в стаде рассматриваемого предприятия прослеживается повышение удоев и снижение жирно- и белковомолочности. Наиболее высокий удой наблюдается у коров шведской (9190 кг) и итальянской (8148 кг) селекций, удой этих коров достоверно (Р = 0,999) превышает средний по стаду на 2019 и 977 кг соответственно; массовая доля жира и белка в молоке – у коров российской селекции (4,26 и 3,54% соответственно); у животных белорусской селекции удой составил 6714 кг при жирно- и белковомолочности 4,24 и 3,49% соответственно. С увеличением интенсивности формирования животных снижается возраст первого осеменения и увеличивается живая масса при первом осеменении, наиболее близки к оптимальным параметры у умеренноформирующихся животных. У них же отмечен и наиболее высокий удой за 305 дней первой лактации – 7226 кг, что достоверно (Р = 0,95) превышает этот показатель у медленно- и быстроформирующихся животных на 264 и 150 кг соответственно. The purpose of the work is to establish the influence of the genotype and intensity of cows’ formation on the level of their lactation performance in one of the enterprises of the Minsk region of the Republic of Belarus. The object of research was 940 cows of the Belarusian Black-and-White breed with different genotype proportions for the Holstein breed. To group cows by genotypes, each animal was determined by directional affiliation, race by Holstein breed and country of father selection. When assessing the lactation performance of cows, the following indicators were taken into account: yield for 305 days of the first and last completed lactation; weight fraction of fat, %; weight fraction of protein, %; milk fat and protein yield, kg. It was established that with an increase in breeding in the Holstein breed, cows in the herd of the enterprise under consideration show an increase in yields and a decrease in fat and protein milking capacity. The highest yield is observed in cows of Swedish (9190 kg) and Italian (8148 kg) selection, the yield of these cows significantly (P = 0.999) exceeds the herd average yield for 2019 and 977 kg, respectively; mass fraction of fat and protein in milk – in cows of Russian selection (4.26 and 3.54%, respectively); in animals of Belarusian selection the yield was 6714 kg with fat and protein milking capacity of 4.24 and 3.49%, respectively. As the intensity of animal formation increases, the age of the first insemination decreases and the live weight increases at the first insemination, the parameters are closest to optimal in moderately forming animals. They also had the highest yield for 305 days of the first lactation – 7226 kg, which significantly (P = 0.95) exceeds this indicator in slow and fast-forming animals by 264 and 150 kg, respectively.

scholarly journals DAIRY CATTLE BREEDING IN KIROVOGRAD REGION

2019 ◽  
Vol 57 ◽  
pp. 60-67
Author(s):  
G. D. Іlyashenko
Keyword(s):  
Dairy Cattle ◽  
Milk Fat ◽  
Live Weight ◽  
Breeding Value ◽  
Milk Productivity ◽  
Cattle Breeding ◽  
Agricultural Enterprises ◽  
Dairy Cattle Breeding ◽  
The Difference ◽  
Breeding Farms

Dairy cattle breeding is one of the leading livestock sectors whose purpose is to ensure the production of high quality dairy raw materials in volumes meeting the scientifically grounded standards of state food security and expanding the export potential of the agrarian sector. The purpose of our research was to study the status and prospects of dairy cattle breeding in the Kirovograd region. Material and methods of research. The research was carried out on the basis of the electronic database of breeding goals (including 2312 cows), official statistics and estimates of cattle of various breeds that are involved in the production of dairy direction in the breeding farms of the Kirovograd region. The analysis used zootechnical and statistical methods. The calculations were carried out using the software package "STATISTICA-6,1" Results. According to the research (2001–2018), the cattle population in the Kirovograd oblast decreased by a factor of 2.6. Thus, as of January 1, 2018, its number constituted 96.3 thousand heads in all categories of farms, 53.1 thousand of them were cows, the number of which also decreased by 2.4 times. Specific gravity of cattle population of farms remains significant and makes up 72.7%, and 80.6% in the livestock of cows. The largest number of cows of agricultural enterprises declined significantly. Thus, as of January 1, 2018, their number was 10.3 thousand goals, which is 4.7 times less than in the same period of 2001. In the households there is also a tendency for a permanent reduction of cows, the difference is, respectively, 37.0 thousand heads or 46.4% The development of dairy cattle breeding is characterized by two opposite tendencies: reduction of livestock of cows and increase of their productivity. Thus, in agricultural enterprises in 2010, compared to 2000, hopes per cow increased by 2.5 times, in all categories of farms by 1.8 times. In 2017, the increase in dairy costs in agricultural enterprises compared to 2010 amounted to 60.0% in farms of all categories 12.2%. The researches found that in the agricultural enterprises of the oblast as of January 1, 2018 there are 26256 head of cattle, including 10281 cows. The breeding part of the existing cows is 3.013 heads, 29.3% of the total number located in 10 breeding farms. The analysis of the genealogy structure showed that the experimental population of cows belongs to 18 lines and related groups of which the most numerous Chifa 1427381 – 20.4%, Starbuck 352790 – 20.1%, Henev 1629391 – 18.6% , Eleusis 1491007 – 11.2%, Family 267150 – 10.8%. Among the indicated lines, the lowest level of milk productivity was first-born cows. The 1491007, the milk of milk for 305 days of lactation was 4466 ± 99.8 kg, and the milk fat was 168.2 ± 6.5 kg. Analogues l Starbak 352779 was characterized by the highest milk productivity, its level was 5696 + 98.8 kg and 224.9 ± 9.7 kg, respectively. The difference in stomach was 1230 ± 140.4 kg (td = 10.2) and at the release of milk fat 56.7 ± 5.28 kg (td = 10.2) at P < 0.001. However, the latter were markedly less service life (125 against 168 days) and logically higher reproduction rate compared to other lines. An analysis of the intensity of the formation of live weight of young animals has been established for its highest growth in heifers of controlled herds in the period from 9 to 12 months. Thus, in animals of Ukrainian red breed, the growth rate of live weight during this period was 75 kg, Ukrainian red-shrimp 61 kg, Ukrainian black-and-white 73 kg, Holstein 76 kg. Accordingly, during this period, the average daily gain of live weight of young breeds of these breeds was 833 g; 678 g; 811 g, 835 g. The sharp fluctuations of average daily increments during growing periods, first of all, testify to the unequal conditions of growing and feeding young animals than the breed differences. In general, as a result of the analysis of the formation of live weight of heifers, a significant level of phenotypic variability was observed, which confirms sufficient genetic resources and preconditions for selection on the given sign. Therefore, proceeding from the above, in the long run, selection work for breeding improvement of cattle breeding farms of the Kirovograd region should be conducted in accordance with certain promising directions according to groups of breeds. Conclusions. A very important factor in the growth of milk production in the Kirovograd region is high-yield pedigree cattle. The main task on the way of bringing breeding cases in dairy farming to the modern level is the introduction of computer breeding records in breeding farms. This will allow to estimate in the near future bulls-pedigrees, which were used in the past in these farms, to allocate among them complex improvers for precisely the specific conditions and maximally attract them for reproduction. On the other hand, a reliable clogging of poor quality in the genetic sense of sperm production, which leads to negative consequences, will be posed. When establishing the assessment of the breeding value of bulls and developing a single plan of breeding and breeding work in the region, one can proceed to the next step of improving breeding and breeding business, introducing a progressive method of raising the breeding value of animals of large-scale breeding. As a result, the profit from the breeding of highly productive animals, well adapted to specific conditions, will significantly exceed the costs. At the same time, the proposed measures will allow the breeding business to be brought up to the modern world level and stimulate highly productive cattle breeding.

scholarly journals Characteristics of the productive-economic indicators of cows of Yaroslavl breed of different genotypes

2020 ◽  
pp. 43-52
Author(s):  
N. Kosyachenko ◽  
Marina Abramova ◽  
M. Lapina
Keyword(s):  
Protein Content ◽  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Live Weight ◽  
Practical Significance ◽  
Holstein Breed ◽  
Blood Fraction ◽  
The Impact ◽  
The Relationship

Abstract. Aim. The study of the influence of crossbriding on the growth and development of heifers and subsequent productive and reproductive qualities of cows on the first lactation. Methods. Using statistical methods, correlation analysis and ANOVA for evaluated genetic indicators of economic-valuable traits of dairy cattle. In particular was studied live weight of heifers from birth to 18 months, first insemination age and first fecundation age, live weight at fecundation, frequency of insemination, first calving age, days open, live weight at first lactation, milk yield for 305 days (kg), fat (%, kg) and protein (%, kg) in milk. Results. Relationship between productive indicators and the genotype of the animal is established. When assessing the strength of the influence of the factor «blood on the Holstein breed» it was found that the greatest impact can be traced at the age of 6 and 18 months, and is respectively 12.7 % and 17.1 %.The reproductive qualities of the first-calf cows decreased with the increase percent of blood in the Holstein breed. Evaluation of the impact of crossbreeding on milk production at first lactation has revealed significant strong influence on milk yield for 305 days of first lactation, and related signs the amount of milk fat and protein. According to qualitative indicators, the low influence of the Holstein blood fraction was found, while to a greater extent on the fat content than on the protein content in milk. Evaluation of phenotypic and genotypic correlations of milk yield and quality components of milk revealed average negative phenotypic and low negative genotypic correlation in all groups. The exception was in heifers of Yaroslavl breed with percent of Holstein blood less than 50 %, in which the relationship of yield x protein was positive. The relationship between milk yield and fat and protein content in milk has the opposite moderate character and strength. Practical significance. Studies was established that breeding of animals of Holstein and Yaroslavl breeds in one herd allows to receive an optimum ratio of milk production with optimal percentage fat and protein. For this herd among animals of the improved genotypes of the Yaroslavl breed, the use of genotypes with a percent of blood in the Holstein breed from 75.1 % to 87.6 % is optimal, which should be taken into account when selecting bulls to the breeding program.

Dynamics of the live weight of replacement heifers depending on their origin from the sire

2021 ◽  
pp. 24-30
Author(s):  
O. V. Gorelik ◽  
N. A. Fedoseeva ◽  
A. S. Gorelik ◽  
E. V. Koksharov
Keyword(s):  
Dairy Cattle ◽  
Gene Pool ◽  
Live Weight ◽  
Age Dynamics ◽  
Breeding Stock ◽  
Black And White ◽  
Holstein Breed ◽  
White Breed ◽  
Intensive Rearing ◽  
Selection Of

In the last few decades the improvement of domestic dairy cattle was due to the widespread use of the gene pool of the best world breed such as Holstein. As a result of crossbreeding the breeding stock of the domestic Black-and-White breed with the sires of Holstein breed in different regions of the country a population of crossbreds has been created. The purpose of the work was to study the age dynamics of the live weight of replacement heifers depending on the paternal origin and the correlation between the indicators for the growth periods. The daughters of different sires have a difference in their live weight at the first insemination. The live weight of more than 400 kg was obtained from replacement heifers obtained from the sires Saber, Decaro and Baquero. The daughters of the sires Gatedenser, Bentley and Alta Ciara in live weight were inferior to their herdmates by 2,7–9,3 kg or by 0,7–2,8 % (P ≥ 0,05). The bulk of the replacement heifers are inseminated at the age of 13 months and only the daughters of the sire Alta Ciara are inseminated at the age of 14,1 months with a live weight of 396,7 kg. Despite the almost identical live weight of heifers at birth they differed from each other in the process of rearing. It has been established that the live weight at birth is not an indicator for assessing the further growth of replacement young animals. At 6 months of age the correlation of live weight at the age of 6 months and at the first insemination was positive and ranges from 0,01 (daughters of the sire Baquero) to 0,55 (daughters of the sire Decaro). Selection of heifers at the age of 6 months by their live weight allows us to choose the best and provide the opportunity to inseminate them at the age of 12–13 months with the organization of intensive rearing.

The effect of different levels of nutrition at two stages of the lactation on milk production and live-weight change in Friesian cows and heifers

1981 ◽  
Vol 96 (3) ◽  
pp. 677-690 ◽  
Author(s):  
M. J. Strickland ◽  
W. H. Broster
Keyword(s):  
Milk Production ◽  
Milk Fat ◽  
Live Weight ◽  
Residual Effects ◽  
Early Lactation ◽  
Or Groups ◽  
Regular Increase ◽  
Experimental Treatments ◽  
Two Stages ◽  
Friesian Cows

SUMMARYOver the 4 years 1965–8, a total of 105 mature Friesian cows and 84 Friesian heifers were fed various levels of nutrition at two stages of the lactation to study the effect on milk production. The experiments were carried out over a whole lactation at four Experimental Husbandry Farms, Boxworth, Bridget's, Great House and Trawsgoed. There were three treatment levels in early lactation (weeks 3–10) comprising 5·9, 7·8 or 9·8 kg D.M./day of concentrates for mature cows and 1·6 kg D.M./day less at each level for the heifers. In mid-lactation (weeks 12–18) the two lower levels of concentrates were fed arranged factorially with early-lactation levels. A basal forage ration usually of hay was fed to provide 85% of the basal maintenance requirements. During the remainder of the lactation all animals received the same level of nutrition. In addition to the pre-determined feed treatments, one further group of animals in each block was fed according to the milk production in the preceding week.Overall an increase in level of nutrition in early lactation produced a regular increase in milk production from successive increments with adult cows but only for the first increment with heifers. Raising feed level in mid-lactation increased milk production for all animals. There were considerable residual effects from early-lactation feeding but these were less with mid-lactation feeding. These same effects were also noted with yields of solids-not-fat and to a less extent in milk fat production.The experimental results indicated not only the mean effects of treatments but more important the interaction with individual animals. Study of the response of individual animals indicated that the effects of level of feeding varied in proportion to the potential of the cow. The presentation of mean results can therefore be misleading. The potential of a cow was indicated by milk production in the immediate post-calving period. This period could be used both in experimental designs for selecting animals in the allocation to experimental treatments and also in the practical context for rationing individuals or groups of cattle.The absolute plane of nutrition related to the potential of the animal was the most important factor in determining the efficiency of utilization of feed for milk production.

Rearing of dairy cattle 3. A note on the use of whole milk for calves fed once daily

1972 ◽  
Vol 15 (3) ◽  
pp. 315-318 ◽  
Author(s):  
J. D. Leaver ◽  
N. H. Yarrow
Keyword(s):  
Growth Rate ◽  
Weight Gain ◽  
Dairy Cattle ◽  
Daily Intake ◽  
Live Weight ◽  
Once Daily ◽  
Live Weight Gain ◽  
The Third ◽  
Whole Milk ◽  
Milk Substitute

SUMMARYWhole milk was given once daily to three groups each of 18 Friesian heifer calves and concentrates and hay were also available. Calves in one group received 2·4 kg milk/day and in a second 3·0 kg milk/day and in both of these groups individual calves were weaned when their daily intake of concentrates reached 400 g. In the third group the calves received 3·0 kg milk/day and were weaned after 28 days. Concentrate and hay intakes were not significantly affected by the treatments. Mean growth rate over 56 days increased with increasing quantity of whole milk offered but the differences between treatments were not significant. The performance of calves given whole milk was compared with the performance achieved in previous experiments where milk substitute was given. It was estimated that 1 kg whole milk gave the same live-weight gain as 170 g milk-substitute powder. From this estimate price/cost relationships were determined to indicate when whole milk or milk substitute should be fed to calves.

scholarly journals Behavioral, productive, reproductive and thermoregulatory performance of lactating 3/4 and 7/8 Holstein/Gir cows

2021 ◽  
Vol 42 (3) ◽  
pp. 1245-1258
Author(s):  
Diogo Alves da Costa Ferro ◽  
◽  
Rafael Alves da Costa Ferro ◽  
Klayto José Gonçalves dos Santos ◽  
Aracele Pinheiro Pales dos Santos ◽  
...  
Keyword(s):  
Milk Fat ◽  
Dairy Farm ◽  
Experimental Period ◽  
Climatic Conditions ◽  
Genetic Composition ◽  
Comfort Index ◽  
Holstein Breed ◽  
Lactating Cows ◽  
Randomized Design ◽  
Significant Difference

The aim of this study was to examine the behavioral, productive, reproductive and thermoregulatory performance of 3/4 and 7/8 Holstein/Gir (HG) dairy cows to identify which genetic composition suffers the least heat stress. A completely randomized design was adopted involving 20 multiparous, lactating crossbred cows from a dairy farm located in the municipality of Turvânia - GO, Brazil. During the experimental period, data on behavioral, productive, reproductive and thermoregulatory traits were collected every 15 days. Bioestat (5.0) statistical software was used for statistical analysis. The mean temperature-humidity index, ambient temperature and relative humidity obtained throughout the experimental period were 74.45, 30.51 ºC and 63.64%, respectively. In terms of reproductive performance, there was a significant difference (p < 0.05) between the genetic compositions for the time from calving to first service, with a longer period shown by the animals with greater Holstein breed genetic composition. Service period and calving interval differed significantly (p < 0.05) during the experimental period between the genetic compositions. A significant difference (p < 0.05) was also detected between the compositions for respiratory rate, with higher values observed in the animals with higher European genetic composition. Benezra thermal comfort index also differed significantly (p < 0.05), with the 7/8 HG animals showing a higher value. Lactating cows with a 7/8 HG genetic composition achieved better results in milk production, whereas those with 3/4 HG genetic composition showed superiority in milk fat composition and reproductive and thermoregulatory performance, indicating greater adaptation to the climatic conditions of the region.

scholarly journals Reproductive ability and milk productivity of cows depending on breeding value of their progenitors

2017 ◽  
Vol 19 (74) ◽  
pp. 48-51
Author(s):  
L. V. Ferenz
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Live Weight ◽  
Breeding Value ◽  
Milk Productivity ◽  
The Third ◽  
Reproductive Ability ◽  
Service Period ◽  
Significant Difference ◽  
The Difference

The influence of bullock`s different breeding value for reproductive ability and milk production of their  daughters were investigated. Established that the age of first productive insemination of heifers Ukrainian black spotted milk breed, was 17.5–18.6 months and age of first calving – 26.6–27.8 months. Heifers` live weight at the first insemination was 361.4–407.1 kg. During first lactation the highest productivity had daughters from parents with breeding value by milk yield more than 801 kg. In the first lactation wasn’t found significant difference in duration service-period and interparturition-period for cows derived from progenitors with different breeding value. In the second lactation best indexes in duration service-period and interparturition-period for cows derived from progenitors with breeding value by milk yield 601–800 kg and more than 801 kg. In the third, the highest lactation, these indexes were best for cows derived from progenitors with breeding value by milk yield 601–800 kg. The difference in milk yield during first lactation between heifers received from progenitors with breeding value by milk yield less than 200 kg and heifers from bullock`s  with breeding value 401–600 kg was 292 kg. The difference in milk yield between heifers received from progenitors with breeding value by milk yield less than 200 kg and heifers from bullock`s  with breeding value  with breeding value 601–800 kg  was 660.3 kg. The difference in milk yield between heifers received from progenitors with breeding value by milk yield less than 200 kg and heifers from bullock`s  with breeding value more than 801 kg was  920.8 kg In the second lactation this difference was 589.8 (Р < 0.001), 841.5 (Р < 0.001) і 894.4 (Р < 0.001) kg of milk, in the third, the highest lactation – 754.5 (Р < 0.001), 951.8 (Р < 0.001) і 1335.7 кг (Р < 0.001).

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