scholarly journals Genetic parameters of some productive and reproductive traits in sheep from the Bulgarian dairy synthetic population (BDSP) and its crosses with Lacaune and Assaf

2021 ◽  
Vol 37 (4) ◽  
pp. 263-277
Author(s):  
Georgi Kalaydzhiev
Keyword(s):  
Genetic Diversity ◽  
Statistical Model ◽  
Milk Yield ◽  
Genetic Parameters ◽  
Phenotypic Diversity ◽  
Live Weight ◽  
Reproductive Traits ◽  
Software Product ◽  
Synthetic Population ◽  
Different Levels

Dominating in recent years in Bulgaria are the sheep from the Bulgarian Dairy Synthetic Population (BDSP) and its crosses with other dairy breeds. This in turn leads to significant, scientifically based genetic and phenotypic diversity and different levels of productivity. The aim of the study is to research and characterize the genotypic parameters of the main productive and reproductive traits in sheep from the Bulgarian dairy synthetic population and its crosses with the breeds Lacaune and Assaf. The study includes a total of 3212 ewes reared in 15 farms, as from Bulgarian dairy synthetic population - 1114 ewes, BDSP crosses with Assaf - 1052 ewes and BDSP crosses with Lacaune - 1046 ewes, born in the period from 2014 to 2019 including. Studied trait were: milk yield for a standard 120-day period of I, II and III lactation, biological fertility of the 1st, 2nd and 3rd lambing and the trait - live weight of different age categories. The statistical model used was based on the model of animal /Animalmodel /, using the software product VCE and PEST (Groeneveld). Heritability in the main selection trait milk yield of the 1st, 2nd and 3rd lactation reaches from low to moderate and medium values. The lowest level of genetic diversity is in BDSP - h? varies from 0.125 to 0.157, in BDSP x Assaf from 0.131 to 0.202, and with the highest genetic diversity in the studied trait are ewes BDSP x Lacaune, respectively from 0.342 to 0.397. The rates of fertility in all three studied groups were from low to moderate h? - in BDSP from 0.133 to 0.156, in BDSP x Lacaune - from 0.040 to 0.112 and in BDSP x Assaf - from 0.100 to 0.122.

scholarly journals Some productive and reproductive traits in sheep from the Bulgarian Dairy Synthetic Population (BDSP) and its crosses with Lacaune and Assaf: 2. Phenotypic parameters

2021 ◽  
Vol 37 (4) ◽  
pp. 279-291
Author(s):  
Georgi Kalaydzhiev
Keyword(s):  
Milk Yield ◽  
Live Weight ◽  
Reproductive Traits ◽  
Fertility Rate ◽  
Sheep Population ◽  
Software Product ◽  
Synthetic Population ◽  
Different Levels

Bulgarian Dairy Synthetic Population (BDSP) and its crosses with other dairy breeds are the most numerous sheep population in Bulgaria. There are significant phenotypic diversities and different levels of productivity. The aim of the study is to research and characterize the phenotypic parameters of the main productive and reproductive traits in sheep from the Bulgarian dairy synthetic population and its crosses with the breeds Lacaune and Assaf. The study includes a total of 3212 ewes BDSP and their crosses with Assaf and Lacaune. Studied trait were: milk yield for a standard 120-day period of I, II and III lactation, biological fertility of the 1st, 2nd and 3rd lambing and the trait - live weight of different age categories. The software product SYSTST 13 and SPSS - Descripive statistics were used to conduct the study. With the highest milk yield of the 1st, 2nd and 3rd lactation were the sheep BDSP x Lacaune - 186.28 l, 194.03 l, 200.56 l, followed by BDSP x Assaf - 184.27 l, 191.87 l and 198.64 l and those of BDSP - 134.18 l, 139.48 l and 144.33 l. The average phenotypic values of the traits live weight at weaning, at 18 months and 2.5 years are close - respectively in BDSP - 25.21 kg, 60.59 kg and 65.50 kg, for BDSP x Lacaune - 25.17 kg, 60.52 kg, 65.44 kg and for BDSP x Assaf - 25.19 kg, 60.58 kg, 65.67 kg. Fertility indicates the highest average values of the crosses BDSP with Lacaune from 1.53 to 1.59, followed by BDSP x Assaf from 1.40 to 1.46. The lowest fertility rate had the ewes from BDSP from 1.22 to 1.25.

scholarly journals Genetic diversity derived from pedigree information and estimation of genetic parameters for reproductive traits of Limousine and Charolais cattle raised in Italy

2020 ◽  
Vol 19 (1) ◽  
pp. 762-771 ◽  
Author(s):  
Marcos Paulo Gonçalves de Rezende ◽  
Carlos Henrique Mendes Malhado ◽  
Stefano Biffani ◽  
Paulo Luis Souza Carneiro ◽  
Riccardo Bozzi
Keyword(s):  
Genetic Diversity ◽  
Genetic Parameters ◽  
Reproductive Traits ◽  
Pedigree Information ◽  
Charolais Cattle ◽  
Estimation Of Genetic Parameters

scholarly journals Genetic Parameters of Milk Yield in Bulgarian Dairy Synthetic Population Sheep

2018 ◽  
Vol 6 (4) ◽  
pp. 1-10
Author(s):  
Jivko Krastanov ◽  
Nevyana Stancheva ◽  
Теоdora Angelova ◽  
Georgi Kalaydzhiev ◽  
Stayka Laleva ◽  
...  
Keyword(s):  
Milk Yield ◽  
Genetic Parameters ◽  
Synthetic Population

scholarly journals SELECTIVE- GENETIC PARAMETERS AND EVALUATION OF PHENOTYPIC VARIATION ACCORDING TO THE RANGE OF ENVIRONMENTAL AND GENETIC FACTORS OF ECONOMIC TRAITS OF AYSIRE BREED COWS

2020 ◽  
pp. 158-164
Author(s):  
Е.V. Arlimova ◽  
◽  
Е.А. Smotrova ◽  
Keyword(s):  
Milk Yield ◽  
Genetic Parameters ◽  
Selection Index ◽  
Influence Factors ◽  
Live Weight ◽  
Leningrad Region ◽  
Economic Traits ◽  
Genetic Progress ◽  
Service Period ◽  
Animal Milk

Actuality of research data is in contribution rate of growth of genetic progress according to main economic traits in Ayshire populations at the cost of conducting correlative- regression analysis and study of influence factors, as a preparatory phase in development of selection index for selection of animal units into selected groups. Study sample of cow heifers (n=12821), which are offsprings of 232 servicing bulls from 13 farms, is modified to normal distribution with the help of R-studio program (on control of events, emergence, removal of empty and impossible values). Calculation and analysis of selective- genetic parameters of economic traits are conducted, and also impact assessment of genetic and paratypic factors on realization of economic traits of local cattle population of Ayshire breed in Leningrad region for the period from 2014 to 2018. Animal milk production was 6848 kg with fat mass percentage and protein 4,07 and 3,29 %. We established lowering of MOP duration and reproductivity coefficient and fertility index (RC and FI). Multiregressional model was formed including into formula percentage of fat, protein, live weight and service period. It was established that with fat increase for 1 % milk yield will decrease by 15,3 kg, but with increase of protein on the same value- for 107,8 kg of milk. The most accurate influence on studied economic traits had father factor (14,97 – 41,58% ***). Consequently, with the aim to achieve positive result in population development of Ayshire cattle it is necessary to use bulls, having high genetic potential of milk yield and reproductive qualities.

PSVIII-6 Genetic features of Russian Simmental cattle population different origin derived by assessing milk production and fertility traits

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 241-241
Author(s):  
Larisa P Ignatieva ◽  
Alexander A Sermyagin ◽  
Sergey Nikitin
Keyword(s):  
Milk Yield ◽  
Live Weight ◽  
Reproductive Traits ◽  
Selection Response ◽  
Meat Production ◽  
Fat Percentage ◽  
Improvement Strategy ◽  
Milk Traits ◽  
Simmental Cattle ◽  
Breed Improvement

Abstract Since the beginning of the 20th century, over 43 thousand animals of Simmental cattle and related breeds have been imported to Russia from Europe. This had a significant impact on the selection intensity and genetic structure within the pale-motley population. The research included 42 breeding herds from 14 regions of Russia. The EBV using the BLUPF90 program based on the ANIMAL MODEL procedure was calculated. Totally of 1471 bulls by using 61816 daughters were estimated. The heritability coefficients showed moderate variability for milk yield (MY) h2=0.140, fat percentage (FP) h2=0.194, protein percentage (PP) h2=0.184 and live weight h2=0.163, as an indirect predictor for meat production. The variability for fertility features like number of inseminations per conception and days open was h2=0.073 and h2=0.061, respectively. Genetic correlation between MY and FP was rg=0.149, and for MY and PP – rg=0.180, while between FP and PP – rg=0.226. The average bulls’ EBV for milk traits in Red Holsteins consisted +23 kg MY, +0.002% FP and +0.001% PP, by Austrian Simmental +10 kg MY, +0.013% FP and +0.002% PP. For Russian Simmental origin animals was signed negative selection response for MY (-23 kg), FP (-0.001%) and PP (-0.003%). High average EBV for imported Simmental cows were revealed +146 kg MY, +0.009% FP and +0.004% PP, while in Russian Simmental we got negative values for MY -70 kg and PP -0.004% but only for FP was showed positive level +0.001%. Simmental breed improvement strategy in Russia focused not only to increasing milk yield but also to improving milk compositions with stabilizing cows’ reproductive traits using the world gene pool of related breeds from Europe. The study was funded by Ministry of Science and Higher Education No.0445-2021-0016

Systems of concentrate allocation for dairy cattle 2. A comparison of two patterns of allocation for autumn-calving cows offered two qualities of grass silage ad libitum

1984 ◽  
Vol 39 (3) ◽  
pp. 325-333 ◽  
Author(s):  
W. Taylor ◽  
J. D. Leaver
Keyword(s):  
Milk Yield ◽  
Post Partum ◽  
Live Weight ◽  
Metabolizable Energy ◽  
Flat Rate ◽  
Treatment Groups ◽  
Period 2 ◽  
Silage Quality ◽  
Ad Libitum ◽  
Different Levels

ABSTRACTIn a 25-week experiment beginning at week 3 post partum, grass silages of 10·5 (H) and 8·9 (L) MJ metabolizable energy per kg dry matter (DM) were offered ad libitum to two groups of 24 autumn-calving dairy cows. Within each silage-quality group, two patterns of concentrate allocation were compared, a flat-rate (F) and a variable rate (V). All four treatment groups, HF, HV, LF and LV, received on average 1575 kg fresh weight per cow of a concentrate containing 170 g crude protein per kg during the 25 weeks. The cows on treatment F were all individually given 9 kg concentrate per day throughout. Individuals on the V treatments received different levels of concentrate, based initially on their 14-day milk yield and then reduced by 1 kg/day at 10, 15 and 20 weeks. For treatments HF, HV, LF and LV respectively, mean adjusted daily milk yields were, 24·4, 24·1, 21·6 and 22·1 kg; intakes of silage DM, 9·1, 8·7, 7·6 and 7·6 kg/day, and live-weight gains, 0·39, 0·31, 0·28 and 0·22 kg/day. The effects of silage quality were significant in each case, but the effects of pattern of concentrate allocation were not. Cows given the H silage produced milk with significantly greater lactose and solids-not-fat concentrations. During the residual period (2 weeks indoors and 14 weeks grazing) no significant differences in milk yield were observed. The 305-day yields of 6215, 6096, 5786 and 5824 kg for treatments HF, HV, LF and LV respectively, reflected the differences obtained during the indoor feeding period.

scholarly journals The effect of the age аt conceiving on the productivity traits at dairy ewes in Bulgaria

2011 ◽  
Vol 27 (3) ◽  
pp. 1147-1156
Author(s):  
E. Raicheva ◽  
T. Ivanova
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Live Weight ◽  
Milk Composition ◽  
Management Decisions ◽  
Dairy Ewes ◽  
Ewe Lambs ◽  
Significant Difference ◽  
Synthetic Population

The aim of the research was to study the effect of the age at conceiving on the productivity traits of sheep from Synthetic population Bulgarian milk in Bulgaria. The experiment was conducted with 20 ewes traditionally conceived at the age of 18 months and 20 ewes conceived as ewe lambs at the age of 11 months on first lactation and their lambs (47) reared in IAS - Kostinbrod, Bulgaria. The 120 days milking milk production and that after 120 days until the end of lactation were determined by the AC method of ICAR. The days after the standard period until the end of lactation were registered. The milk composition was measured by milk analyzer Ekomilk, Bultech Company, Bulgaria. The live weighs were measured. The fecundity was determined. With the exception of the fecundity and the standard 120 days milking milk production the age at conceiving influences significantly the live weigh before conceiving, birth live weight of lambs, the duration of the milking period and the milking milk yield (P<0.01; P<0.001). The traditionally conceived ewes had significantly higher live weight before conceiving (52.31 kg), of newborn lambs (5.05 kg), the duration of milking period (187 days) and milking milk yield (130 L) than the early conceived (40.53 kg; 4.16 kg; 120 days; 80.24 L) (P<0.01; P<0.001). For the fecundity and the standard 120 days milking milk production no significant differences were found between the groups (1.08% and 1.25%; 92.27 L and 80.24 L). Significant difference in the milk composition of the ewes conceived at 18 month age compared to the conceived at the age of 11 months (P<0.05; P<0.001) was found. The obtained results provide useful information for the implementation of suitable management decisions for early conceiving of the ewes from Synthetic population Bulgarian milk for production of lambs and milk at the farm practice.

Productive and reproductive traits of cows of Black-and-White and Red Steppe breeds

2020 ◽  
pp. 21-31
Author(s):  
Kh. Valitov ◽  
S. Karamaev ◽  
V. Kornilova ◽  
A. Frolkin
Keyword(s):  
Milk Yield ◽  
Live Weight ◽  
Reproductive Traits ◽  
Local Conditions ◽  
Black And White ◽  
Reproductive Ability ◽  
White Breed ◽  
Peasant Farm ◽  
Daily Milk Yield ◽  
Slight Advantage

A comparative analysis of productive, reproductive and technological traits of cows of Red Steppe and Black-and-White breeds has been carried out under the conditions of peasant farm “PF Ershov” in the Buguruslansky district in the Orenburg region. It has been established as a result of researches that heifers of Red Steppe breed have been effective inseminated by 0,4 months earlier and had live weight more by 18 kg or 3,6 % than herdmates of Black-and-White breed. Animals of Red Steppe breed had a slight advantage over Black-and-White breed in terms of milk yield and fat content. Cows of Red Steppe breed have a higher coeffi cient of lactation constancy. The advantage of cows of Red Steppe breed over Black-and-White first calves was 2,4 %. The advantage of mature lactation of Red Steppe cows over Black-and-White breed was only in the average daily milk yield by 1,2 kg or 5,1 %. Udder in animals of Black-and-White and Red Steppe breeds had a uniform development of the front and rear parts and in absolute terms (42,5–44,3 %) met the requirements of machine milking. In animals of Red Steppe breed the duration of the open days period was on average 12–28 days shorter depending on calving and corresponded to the indicators of highly productive cows. The coefficient of reproductive ability of first-calving cows of Red Steppe breed was 0,87, which is 0,05 higher than in Black-and-White cows; at the second calving – 0,88, which is 0,03 higher than Black-and-White herdmates. Thus, animals of Red Steppe breed on productive and reproductive traits have superiority over herdmates of Black-and-White breed that is explained by their adaptation to local conditions of feeding and housing.

scholarly journals Formation of productive and technological qualities of Holshtinized cattle at different levels of feeding

2021 ◽  
pp. 53-57
Author(s):  
Anatoliу Anatolуevich Velmatov ◽  
Anatoly Pavlovich Velmatov ◽  
Alexander Mikhailovich Guryanov ◽  
Tatiana Nikolaevna Tishkina ◽  
Vladimir Viktorovich Mungin ◽  
...  
Keyword(s):  
Milk Yield ◽  
Live Weight ◽  
Drop Out ◽  
Control Group ◽  
Food Ration ◽  
Physiological Functions ◽  
The Third ◽  
Experimental Group ◽  
Different Levels

The article presents the results of growing Simmental Holstein heifers with a high heredity of 87.5% according to Holstein and the formation of their productive and technological qualities at different levels of feeding. The heifers of the control group received a food ration compiled according to detailed norms, and their counterparts from the experimental groups were 5, 10, 15, 20% higher. Heifers of the 1st experimental group in terms of live weight significantly exceed their peers from the control group: at 3 months of age by 18.3 kg, at 6 by 41.7 kg, at 9 by 55.0 kg, at 12 - tees for 69.3 kg, 15 for 80.3 kg and 18 for 74.5 kg. The advantage of the heifers of the second experimental group in the same age periods is 8.8; 24.4; 38.7; 48.9; 62.9; 56.2 kg. The heifers of the 3rd experimental group outnumbered their analogs by 5.7; 10.3; 22, 5; 27.6; 42.9; 39.2 kg, the 4th experimental group of heifers surpassed their analogues by 2.1; 4.3; 12.9; 10.4; 21.0; 21.7 kg. Animals of the first experimental group were inseminated at the age of 13.8 months, the second - 14.7 months, the third - 15.9 months, the fourth - 17.1 months, and heifers from the control group were inseminated at the age of 18.1 months. From the first heifers of the first experimental group, they drank 8909 kg of milk for the first lactation, 8549 kg for the 2nd group, 8314 kg for the 3rd, 8032 for the 4th, and 7150 kg for the control group, but the life-long milk yield was the smallest among the cows of the first group ... The more productive cows inseminated at the age of 13.8 months drop out earlier than everyone else. Therefore, for such animals it is necessary to create other conditions for feeding and keeping due to the greater intensity of their physiological functions and metabolism in general.

scholarly journals 131 Milk yield of ewes fed with diets of different energy levels

2019 ◽  
Vol 97 (Supplement_1) ◽  
pp. 70-71
Author(s):  
Sarita Bonagurio Gallo ◽  
Vanderlei Benetel Junior ◽  
Fernanda Ferreira dos Santos ◽  
Mariluce Cardoso de Oliveira ◽  
Luis Orlindo Tedeschi
Keyword(s):  
Milk Yield ◽  
Statistical Significance ◽  
Energy Levels ◽  
Live Weight ◽  
Control Group ◽  
Animal Science ◽  
Food Engineering ◽  
Sheep Milk ◽  
Different Sources ◽  
Different Levels

Abstract An adequate sheep milk production ensures survival and optimum lamb’s growth and development through the weaning. To evaluate the effects of different energy sources in the diet of ewes on their milk yield, an experiment was carried out at the Faculty of Animal Science and Food Engineering of USP, Brazil, using 56 pregnant ewes, Dorper and Santa Ines breeds, average live weight of 70 kg, randomly distributed in four treatments: control group (fed according to the 2007 NRC recommendation); and groups with 10% more energy with different sources (starch, ST; protected fat, PF; and chromium, Cr). Dry matter intake was approximately 3% of the live weight of the ewes, to all treatments, but the control group with intake of 2.1 Mcal EM/d and the other with 2.3 Mcal EM/d. Ewes were fed the experimental diets at the beginning (50 d) and end of the gestation (50 d). In the middle of the gestation (50 d) the sheep were fed according to the recommendation of the NRC (2007). At 20, 30, 40, 50, and 60 days post-lambing, the milk yield was assessed using an indirect method of double weighing the lambs (one weight before suckling, another weight after suckling). The ewe milk yield was analyzed using contrasts and statistical significance at 5% of probability. There was no statistical difference (P > 0.05) among the diets evaluated on milk yield of the ewe (0.42, 0.45, 0.38, 0.3, and 0.14 kg/d for 20, 30, 40, 50, and 60 days of lactation). We concluded that milk yield of ewes receiving different levels and source of dietary energy did not differ. Additionally, the use of Cr or protected fat did not influence milk yield when added at 10% of the required energy for lactation. Acknowledgment to FAPESP (process 2017/20555–8).

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