scholarly journals BREEDING AND INDUSTRIAL GROUPS OF FULL-AGING COWS OF RED STEP BREED

2020 ◽  
pp. 27-36 ◽  
Author(s):  
A. S. Durov ◽  
V. S. Deeva
Keyword(s):  
Body Weight ◽  
Milk Yield ◽  
Milk Fat ◽  
Live Weight ◽  
High Productivity ◽  
Breeding Group ◽  
Content Selection ◽  
Significant Difference ◽  
Selection Parameters ◽  
Selection Group

An assessment of the population of red steppe breed cows by exterior and productive characteristics in the formation of production groups allocated for the degree of development of live weight, assessment of the exterior, milk yield, milk fat, milk fat, kg. The following selection parameters were calculated: for live weight - selection group X≥595 kg, production 595> X≥514 kg, marriage X<514; assessment of the exterior – selection group X≥9,46, production 9,46> X≥7,78, marriage X<7,78; for a milk yield for 305 days of lactation, a selection group X≥4481 kg, production 4481> X≥2829 kg, marriage X <2829 kg; milk fat content – selection group X≥4,35 kg, production 4,35> X≥3,99 kg, marriage X<3,99; milk fat - selection group X≥186 kg, production group 186> X≥118kg, marriage X<118 kg. Comparative assessment of the herd shows that animals of the breeding group in live weight by 18,7% exceed the breed standard, in milk yield by 8,7%, in milk fat 20,7%. Evaluation of animal grouping by milk yield shows that cows of a selection group exceed the breed standard by live weight by 6,1%, milk yield by 38,5%, milk fat by 54,3% Animals of the breeding group for milk fat exceed the breed standard by 6,1% in live weight, 36%, in milk yield, in milk fat 53,8%. The selection of the breeding group by body weight contributes to the formation of an array of animals of tall, stretched type with increased milk yield and milk fat. Cows with high milk yield differ from their peers in their greater body weight, milk yield index and milk fat productivity, and have a stretched and wide-grip physique. Uterus with high productivity in milk fat differ from their peers in greater body weight, milk yield, milk yield index, and have a more stretched constitution. For most of the identified dependencies, a significant difference was noted between the traits of different breeding groups. It should be noted that, regardless of the choice of the main feature, there is a tendency to form an array of animals that are distinguished by tall and stretched physique.

scholarly journals Assessment of selection groups of mature cows of various breeds, differentiated by milk fat

2020 ◽  
pp. 73-81
Author(s):  
A. S. Durov ◽  
V. S. Deeva
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Live Weight ◽  
Black And White ◽  
Breeding Group ◽  
Novosibirsk Region ◽  
White Breed ◽  
The Republic ◽  
Selection Parameters ◽  
Breeding Groups

The assessment of black-and-white, red steppe, and Simmental cattle, differentiated by milk fat was carried out. Three groups were formed: selection, production and marriage. The selection parameters are calculated using the standard deviation. The calculated parameters of selection of animals of the breeding group for milk fat in adult black-and-white cows are at least 179 kg, red steppe - 186, Simmental breed from the Novosibirsk region - 143, the Republic of Khakassia - 176 kg. Cows of the red steppe breeding group are leading in productivity. Their milk fat index is 216.8 kg (P ≥ 0.95). In animals of the black-and-white breed, the milk fat productivity is 193.2 kg. In the Simmental Republic of Khakassia it is 193.8, in the Novosibirsk region - 163.5 kg. Analysis of interbreed differences in cows of breeding groups shows that animals of the black-and-white breed surpass their peers in chest width behind the shoulder blades, milk yield and milk production index. Animals of the red steppe breed are the best in milk fat, live weight, width in shanks, oblique body length, oblique rear length, chest girth, milk fat content. Simmental cows bred in the Novosibirsk region lead over their peers in height at the withers, and Simmental cows in Khakassia - in height at the sacrum, chest depth, cannon girth, assessment of the exterior. Evaluation of the production groups of animals for milk fat allows to note that the selection group of the black-and-white breed, despite the superiority in milk yield, is inferior to the peers of the red steppe and Simmental in terms of the evaluated character. However, the cows of the black-and-white breed of the production group surpass their peers in milk fat and most other signs. The formation of breeding groups for milk fat enables to note the consolidation of the black-and-white breed in terms of productive and exterior characteristics. The Red Steppe and Simmental breeds have a high potential for improvement. These breeding groups are worthy of competing with the contemporaries of the black-andwhite breed in milk fat productivity.

scholarly journals PRODUCTIVE QUALITIES OF COWS OF DIFFERENT BREEDING GROUPS OF THE BUKOVINSKY FACTORY OF THE UKRAINIAN RED-AND-WHITE DAIRY BREED

2020 ◽  
Vol 59 ◽  
pp. 60-66
Author(s):  
O. I. Liubynskyi ◽  
R. V. Kasprov
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Milk Fat ◽  
Correlation Coefficients ◽  
Live Weight ◽  
Fat Content ◽  
Positive Correlation ◽  
Breeding Group ◽  
The Difference ◽  
Dairy Breed

The studies were conducted on the materials of the breeding record of the breeding plant of JSC "Mirne" of Chernivtsi region - the basic farm of the Bukovyna factory type of the Ukrainian red-speckled dairy breed. 360 cows were selected for analysis, based on live weight, yields, fat and protein content of milk, total milk fat and protein content. The intensification of dairy cattle breeding necessitates the systematic evaluation of animals in herds and populations on the basis of economically useful traits. Analysis of the productive qualities of the cows of the different breeding groups showed that, by live weight, milk yield, milk fat and protein content, the two-breed (II breeding group) animals were better than the three-breed (I breeding group). The difference for the first lactation was 11.2; 32.9; 1.5; 1.0 kg respectively. In cows with the second lactation, the pattern remained, the difference was 22.2; 395.8; 15.8; 13.1 kg respectively, and for the third lactation – 31.4; 124.3; 4.8; 4.2 kg. The fat and protein content of milk varied between 3.88–3.89% and 3.33–3.34%, respectively. It should be noted that in cows of both groups there was a decrease in milk milk yield with increasing number of lactations.An evaluation of the productive qualities of the first-born cows of the different lines showed that Marshall's first-borns were better in live weight, milk yield, milk fat and protein, although they were inferior to other lines in terms of fat and protein content. In the firstborn of the Hanover Red line, the estimated values were lower than in animals of other lines, in particular – by live weight by 11.4 kg, milk yield by 1115.2 kg, milk fat by 44.1 kg, milk protein by 37.2 kg (Chif line), by 5.4; 1336.5; 52.7; 45.2 kg (Starbuck line) and 14.7; 1465; 55.1; 48.3 kg (Marshall Line).The effectiveness of breeding for increasing dairy productivity of cows depends on the efficiency of selection and selection of animals, taking into account the phenotypic and genetic correlation between economically beneficial traits. It was found that the highest positive values of correlation coefficients were observed in the cows of the studied groups between milk yield and protein content in the context of all lactations – 1st breeding group (r = 0,12–0,25), 2 nd breeding group (r = 0.19–0.3). In the cows of the first breeding group for the first and second lactations revealed not high but positive correlation of milk yield with live weight (r = 0.33–0.49). In the cows of the second breeding group for the first and second lactation positive correlation with milk fat content was found.The first positive cows of different lines showed the highest positive values of the correlation coefficients between milking and protein content (r = 0.19–0.43). There was also a low positive correlation of milk yield with live weight in the firstborn of all evaluated lines (r = 0.03–0.09), as well as milk fat content in cows of Starbuck and Marshall lines.Conclusions. 1. By live weight, milk yield, milk fat and protein content, two-bovine cows of the Bukovyna factory type of Ukrainian red-speckled dairy breed were better than three-born. The fat and protein content of milk varied between 3.88–3.89% and 3.33–3.34%, respectively. In cows of both groups there was a decrease in milk yield with increasing number of lactations.2. By live weight, milk yield, milk fat and protein content, Marshall Line firsts were better, although they were inferior to other lines in terms of fat and protein content. In the firstborn of the Hanover Red line, the estimates were lower than in other line animals.3. The highest positive values of correlation coefficients were observed between milk yield and protein content in the context of all lactations in the cows of Bukovyna factory type of Ukrainian red-rippled dairy breed. In two breeds of cows for the first and second lactation revealed not high but positive correlation of milk yield with live weight, and in three breeds for the first and second lactation positive correlation of milk yield with fat content.

Feeding calcium salts of fatty acids in high-starch or high-fibre compound supplements to lactating cows at grass

1990 ◽  
Vol 51 (3) ◽  
pp. 441-447 ◽  
Author(s):  
P. C. Garnsworthy
Keyword(s):  
Fatty Acids ◽  
Milk Yield ◽  
Milk Fat ◽  
Milk Protein ◽  
Live Weight ◽  
Fat Content ◽  
Calcium Salts ◽  
Significant Difference ◽  
High Fibre ◽  
Grazing Dairy Cows

ABSTRACTIn two experiments, the effects of protected fat and fibre were studied in compound supplements for grazing dairy cows. The protected fat used consisted of calcium salts of long-chain fatty acids. In experiment 1, 17 cows (group S) were given 4 kg/day of a starchy compound and 17 (group F) 4 kg/day of a high-fibre compound containing protected fat for the first 4 weeks after turn-out to grass. No significant difference was found between groups in milk yield, but cows in group F produced milk with a higher fat content (42·6 g/kg) than did those in group S (37·1 g/kg; P < 0·01) and had higher yields of fat (0·88 v. 0·79 kg/day; (P < 0·05). In experiment 2, four groups of five cows were given 4 kg/day of starchy (S) or fibrous (F) compounds, with (P) or without (C) protected fat for the first 4 weeks after turn-out. After 4 weeks, treatments (starchy or fibrous, added fat or none) were reversed for a further period of 4 weeks. There was no significant effect on milk yield, milk protein yield, live-weight change or change in condition score, although cows on treatment SC tended to produce less milk and have greater gains in live weight and condition. For groups SC, FC, SP and FP respectively, milk fat yields (kg/day) were 0·86, 0·98, 0·99 and 1·06 (s.e.d. 0·06); milk protein contents (g/kg) were 34·4, 34·8, 34·2 and 33·0 (s.e.d. 0·68) and calculated milk energy outputs (MJ/day) were 67/2, 74·3, 74·4 and 76·6 (s.e.d. 3·04). It is concluded that substituting fibrous compounds for starchy compounds tends to increase milk fat content and yield; adding calcium salts of fatty acids to either type of compound significantly increases milk fat content and yield but tends to decrease milk protein content.

scholarly journals Comparative evaluation of selections groups for milking of full-age cows of various breeds

2021 ◽  
pp. 71-79
Author(s):  
A. S. Durov ◽  
V. S. Deeva
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Live Weight ◽  
Population Based ◽  
Black And White ◽  
Novosibirsk Region ◽  
White Breed ◽  
Selection Parameters ◽  
Breeding Groups

An assessment of the cow population based on exterior and productive characteristics in the formation of production groups identified by the level of milk yield was carried out. It is established that the selection parameters for the yield of milk in the breeding group of Mature cows of Simmental breed in Novosibirsk region for black-motley breed on 15% exceeds the requirements of the standard, red steppe -17.9, Simmental Khakassia - 23.5 %. The analysis of interbreeding differences by breeding groups shows that animals of the black-and-white breed significantly outperform their peers of other breeds in terms of chest width behind the shoulder blades, chest girth, milk yield and milk production index. Animals of the red steppe breed have superiority in live weight, width in makloks, oblique length of the trunk, oblique length of the back, fat content of milk, milk fat. Simmental cows bred in the Novosibirsk region surpass their peers in height at the withers, and simmentals of Khakassia are the leaders in height at the rump, chest depth, waist circumference, and exterior assessment. The assessment of the division of animals of the evaluated breeds into breeding groups by milk yield allows us to note that the leadership of the black-and-white breed is not so obvious among plentiful individuals. Cows of breeding groups of red steppe and Simmental breeds have the same productivity with black-and-white milk yield and milk yield index, and red steppe cows surpass their peers in milkfat content and milk fat. The selection of groups by milk yield showed the consolidation of the black-and-white breed by productive and exterior characteristics. The red steppe and Simmental breeds have a high potential for improvement. their breeding groups closely approach the analogues of the black-and-white breed in terms of milk production.

scholarly journals The influence of live weight of holstein cows on the duration and effectiveness of their economic use during the period of breeding

2017 ◽  
Vol 19 (74) ◽  
pp. 71-75
Author(s):  
N. P. Babik ◽  
Ye. I. Fedorovych ◽  
V. V. Fedorovych
Keyword(s):  
Body Weight ◽  
Milk Yield ◽  
Milk Fat ◽  
Correlation Coefficients ◽  
Live Weight ◽  
The Body ◽  
Holstein Cows ◽  
Life Duration ◽  
The Impact ◽  
Economic Use

There are shown data on the impact of live weight of Holstein cows on the duration and effectiveness of their lifetime use during the period of breeding. It was established that the animals which are not reached to the body breed standard of their weight at some period of age had lower rates and duration of lifetime use and productivity. Animals with live weight at 6 months – 181–220, 12 months – 311–340, 18 months – 411–440, at the first insemination – 411–440 and at first calving – 511–540 kg had the longest life duration, productive use, quantity of lactations during all life and highest lifetime productivity. The highest positive correlation coefficients were established between body weight of cows at different periods of their growth (exception – live weight at first calving) and lifetime milk yield (r = 0.072–0.106), the average lifetime fat milk (r = 0.062–0.126), lifetime quantity of milk fat (r = 0.077–0.112), milk yield per day of life (r = 0.077–0.165) and productive use (r = 0.077–0.112). These links were much weaker between live weight and life duration in the studied ages of animals (r = -0.009 – +0.062), productive use (r=-0.125 – +0.094), lactation (r = -0.093 – +0.038) and the number of lactations during life (r = -0.134 – +0.029). The lowest correlation coefficients were between body weight at first calving of cows and the studied parameters of duration and effectiveness of their lifelong use. The impact of the live weight of animals during growing period on the duration of their economic use was the highest (23.34–31,30%), the number of lactations for life (13.79–28.08%), lifetime milk yield (11.89–15.68%) and lifetime amount of milk fat (11.42–15.16%).

РЕАЛИЗАЦИЯ ГЕНЕТИЧЕСКОГО ПОТЕНЦИАЛА ГОЛШТИНСКОГО СКОТА ПРИ СОЗДАНИИ ВЫСОКОПРОДУКТИВНОГО СТАДА ЗАО «ПЗ «РАБИТИЦЫ»

2019 ◽  
Author(s):  
E.I. SAKSA
Keyword(s):  
Dairy Cattle ◽  
Milk Yield ◽  
Milk Fat ◽  
Live Weight ◽  
Breeding Value ◽  
Cow Milk ◽  
Holstein Cattle ◽  
Leningrad Region ◽  
High Productivity ◽  
Genetic Potential

The article demonstrates the feasibility of creating a highly productive herd through the realization of the genetic potential of Holstein cattle. In the pedigree farm of the Leningrad Region, a highly productive Holstein herd has been created with a per 1 cow milk yield of 13,116 kgs in 2018 (n = 1,400) suitable for operation under conditions of complex automation of the production process. In the farm starting from 1985 to 2018 the milk yield increased annually by an average of 253 kgs  per 1 cow. The level of profitability of dairy cattle ranged from 25% to 51.7% over the past 5 years. Cows of the breeding farm even at first lactation demonstrate high productivity. Animals of 2015 year of birth at the age of 25.1 months at the first calving, having a live weight of 616 kgs, produced 11,512 kgs of milk for 305 days of lactation (the duration of the service period is 135 days). The highest daily milk yield for 100 days was 70.41 kgs and for 305 days at third lactation – 19,254 kgs of milk; the highest lifetime productivity  - 103,093 kgs of milk, 4,043 kgs of milk fat and 3 227 kgs of milk protein (registered for 7 lactations). High dairy productivity of 11,507 – 12,977 kgs of milk had daughters of bulls-improvers with breeding value by milk yield ranging from +151 to +1,380 kgs of milk in comparison with herdmates. The breeding farm is a leading producer of Holstein breeding bulls, for the period of 2014-2018,  181 breeding bulls were sold to AI stations of the Russian Federation. The creation of a highly productive herd through the use of the genetic potential of Holstein cattle became possible due to the introduction of a well established system the dairy cattle management the basis of which includes: a fully balanced cow feeding, the use of bulls-improvers, advanced technologies of cow managment and milking.В статье показана возможность создания высокопродуктивного стада за счет реализации генетического потенциала голштинского скота. В племзаводе Ленинградской области создано высокопродуктивное голштинское стадо с удоем на 1 корову 13116 кг молока в 2018 году (n=1400), пригодное к эксплуатации в условиях комплексной автоматизации производства. В хозяйстве с 1985 по 2018 год удои увеличивались ежегодно в среднем на 253 кг молока от 1 коровы. Уровень рентабельности молочного скотоводства варьировал за последние 5 лет от 25 до 51,7%. Коровы племзавода уже за 1-ю лактацию имеют высокую продуктивность. Животные 2015 года рождения в возрасте 25,1 мес при первом отеле, имея живую массу 616 кг, дали за 305 дней 1-й лактации 11512 кг молока (продолжительность сервис-периода 135 дней). Наивысший суточный удой за 100 дней составил 70,41 кг, а за 305 дней 3 лактации — 19254 кг молока, наивысшая пожизненная продуктивность — 103093 кг молока, 4043 кг молочного жира и 3227 кг молочного белка (за 7 лактаций). Высокую молочную продуктивность 11507—12977 кг молока имели дочери быков-улучшателей с племенной ценностью по удою от +151 кг до +1380 кг молока по сравнению со сверстницами. Племзавод является ведущим репродуктором племенных бычков голштинской породы, за 2014—2018 годы на племпредприятия Российской Федерации был реализован 181 племенной бык. Создание высокопродуктивного стада путем использования генетического потенциала голштинского скота стало возможным за счет внедрения в хозяйство системы ведения отрасли молочного скотоводства, основу которой составляют: полноценное сбалансированное кормление, использование быков-улучшателей, прогрессивные технологии содержания и доения коров

scholarly journals Influence of lactation order and live weight on milk yield and fertility traits in domestic Balkan goat

2010 ◽  
Vol 26 (3-4) ◽  
pp. 179-185
Author(s):  
N. Memisi ◽  
M. Zujovic ◽  
Z. Tomic ◽  
M.P. Petrovic
Keyword(s):  
Body Weight ◽  
Milk Yield ◽  
Live Weight ◽  
Significant Difference ◽  
Body Weights ◽  
Total Milk ◽  
One Year ◽  
Fertility Traits

The goal of investigation in the domestic Balkan goat was to establish the effect of body weight and lactation number on milk yield and fertility. Research was done in herds belonging to private farmers, during a one-year period, on a total of 578 goats. Investigated herds were monitored also by lactation number, i.e. kidding number (lactations 1,2 and 3 individually, lactation 4 and following lactations investigated together). Body weight and milk yield were measured, while fertility was determined as the number of live born kids per 100 goats. Goats were also sorted into groups by age and body weight, while the interval within groups and between groups was 5 kg. Average total milk yield in the investigated population of the domestic Balkan goat was 177.5 kg. A statististically significant difference (P<0,01) was established for milk yield depending on body weight and age, except for goats in lactation 1 (P<0,05). In lactation 3 and 4, goats with body weights over 45 kg, comprising 30.23% of the total number in these groups, had the highest milk yields (over 200 kg). Pertaining to lactation number, i.e. kidding number, as well as body weight in both years of investigation, lowest fertility was found in lactations 1 and 2 (112%), and in goats with lowest body weight (25-30 kg), while this considerably increased lactation 4 and later lactations (136%), and body weights of over 40 kg (140%).

MODERN CONDITION AND PROSPECTS OF DEVELOPMENT OF THE UKRAINIAN WHITEHEAD BREED

2016 ◽  
Vol 52 ◽  
pp. 194-202
Author(s):  
S. L. Voitenko ◽  
L. V. Vishnevsky
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Objective Assessment ◽  
Live Weight ◽  
Fat Content ◽  
Early Age ◽  
Average Value ◽  
The Future ◽  
Efficiency Of Selection ◽  
Selection Of

The article shows the state of Ukrainian Whiteheaded cattle, which includes distribution of cattle, the number of animals belonging to respective bloodlines, evaluation of young animals with live weight in the process of growing and milk production of cows during the first lactation. It reflects the historic development of the breed when it was colonism whiteheaded cattle, which turned into the original breed, undergone a significant expansion in livestock and increase of productivity, decreased in the number, was as basis for creation of Ukrainian Black-and-White dairy breed and now bred only in one breeding farm. Visual estimation of animal exterior showed good development of cows and calves and their belonging to the dairy type. In the vast majority the cows of the herd have a black suit, a white head with " glasses" around the eyes, white belly, udder, lower legs and brush of the tail. The youngsters aren’t consolidated by the exterior, and among them there are animals which are not typical for Ukrainian Whiteheaded breed. The young animals have some lag in live weight behind the breed standard [12] to 7 months’ age with exceeding of this trait in certain periods quite significantly in the future. It was established that selection of heifers on live weight will be effective at the early age (1-5 months), given the coefficient of variation of live weight – 22,63-30,21% and will not have a significant influence in the future. Milk yields of first-calf heifers vary considerably depending on the origin. The milk yield of first-calf heifers in the herd was 4238,5 kg on average, the heifers belonging to Mart 171 and Ozon 417 bloodlines had the best milk performance – 4483,1 and 4254,9 kg accordingly. The most aligned milk yield during the first lactation was in the cows belonging to Ozon 417 bloodline, the limits of the trait are 4128,5-4327,4 kg with the average value by the line 4254,9 kg. In contrast, the first-calf heifers of Ryezvyi 33 bloodline with average milk yield 4048,9 kg had limits of the trait 2199,3-4736,1 kg. Even greater range in cows’ milk yield during the first lactation R= 4939 kg (limits 1687 – 6626 kg) is characterized for the herd in general, it shows, on the one hand, the possibility of qualitative improvement of cows’ productivity due to selection on the investigated trait and lack of selection in the herd on the other hand. It was established that daughters of bull Chardash belonging to Ryezvyi 33 bloodline produced 4736,1 kg of milk for 305 days of the first lactation with fat content 3,6%, whereas Zlak’s descendants of the same line were characterized by the lowest milk yield for the first completed lactation – 2199,3 kg with fat content 3,7% and the average value by the line – 4048,9 kg of milk, fat content 3,6%. Similar variability of first-calf heifers’ milk yields, depending on the origin, is typical for other bloodlines of Ukrainian Whiteheaded breed. To increase milk productivity of Ukrainian Whiteheaded cows is recommended to repeat successful combinations of parental forms, and to preserve the breed – to carry out an objective assessment of animals by a range of traits, given the efficiency of selection of heifers on live weight at early age.

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 Milk Yield and Composition of Mixed-Breed Goats on Rangeland during the Dry Season and the Effect on the Growth of Their Progeny

Biology ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 220
Author(s):  
Manuel J. Flores-Najera ◽  
Venancio Cuevas-Reyes ◽  
Juan M. Vázquez-García ◽  
Sergio Beltrán-López ◽  
César A. Meza-Herrera ◽  
...  
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Milk Yield ◽  
Milk Fat ◽  
Body Weight Gain ◽  
Postnatal Growth ◽  
Dry Season ◽  
Weaning Weight ◽  
Northern Mexico ◽  
Mixed Breed

We tested whether the milk yield capacity of mixed-breed goats on a Chihuahuan desert rangeland in northern Mexico during the dry season affects milk composition, body weight gain, and weaning weight of their progeny. Milk yield and composition, and progeny postnatal growth performance, were recorded weekly. One week after kidding, mixed-breed goats (a mixture of Criollo × dairy breeds; n = 40) were allotted into medium (MP) or low (LP) milk yielding groups (20 goats per group). Mean 105-d total milk yield for MP and LP goats was 45.2 ± 12.5 and 20.7 ± 5.2 L, respectively. Milk lactose (4.3 vs. 4.2%) and solids-non-fat (SNF; 8.2 vs. 8.0) differed (p < 0.05) between MP and LP goats; milk protein content tended to differ (p = 0.08) between MP and LP goats with no difference for milk fat content (p > 0.05). Maternal body weight was positively associated with milk yield, milk lactose, and SNF content (p < 0.05 to p < 0.001). Goats giving birth to males produce more milk than goats giving birth to females, but milk fat percentage was higher in goats bearing females (p < 0.001). Milk yield and composition throughout lactation did not influence body weight gain (47.8 vs. 48.7 g/day for kids from MP and LP goats) and weaning weight (6.7 vs. 6.7 kg from MP and LP goats) of the offspring (p > 0.05). Birth weight and weaning weight of the progeny were positively related to maternal body weight (p ≤ 0.05). The postnatal growth of the kids was reduced, extending the time to reach market weight. Nevertheless, non-supplemented mixed-breed goats reared on semi-arid rangeland of northern Mexico have the potential for moderate milk production. Therefore, due to the limited nutrients ingested by grazing goats during the dry season, a nutritional supplement is necessary to keep up milk production and adequate growth of kids.

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