Association of class I bovine lymphocyte antigens with production traits in the Ayrshire breed

1994 ◽  
Vol 74 (4) ◽  
pp. 703-705
Author(s):  
T. R. Batra ◽  
P. A. Macdonald ◽  
M. J. Stear
Keyword(s):  
Key Words ◽  
Milk Fat ◽  
Breeding Value ◽  
Additive Effects ◽  
Production Traits ◽  
Substitution Model ◽  
Ayrshire Breed ◽  
Bovine Lymphocyte ◽  
Lymphocyte Antigens ◽  
Fat Yield

Ninety progeny tested Canadian Ayrshire bulls were serologically typed for the BoLA-A locus to determine the association of these alleles with production traits. After exclusion of bulls carrying alleles that occurred at frequencies lower than 2% or whose production proofs were not available, records from 78 bulls remained for analysis. A gene substitution model, which included the effects of BoLA alleles and the breeding value of the sire of the bull as covariate, was used to evaluate the additive effects of BoLA alleles of bulls (ETAs) on the production traits of their daughters. Allele W17 was significantly associated with ETA for milk, fat and protein yields. Allele CA96 was associated with significant increases in ETA for fat yield. There was no significant association of BoLA alleles with either ETA for fat or protein percentage. Key words: BoLA, production traits, Ayrshire

Association of class I bovine lymphocyte antigens with profitability and lifetime yields in the Holstein breed

1996 ◽  
Vol 76 (1) ◽  
pp. 145-148
Author(s):  
T. R. Batra ◽  
P. A. Macdonald ◽  
M. J. Stear
Keyword(s):  
Dairy Cattle ◽  
Key Words ◽  
Milk Protein ◽  
Breeding Value ◽  
Holstein Cows ◽  
Substitution Model ◽  
Holstein Breed ◽  
Net Returns ◽  
Bovine Lymphocyte ◽  
Lymphocyte Antigens

Ninety-four Holstein cows from the Agriculture and Agri-Food Canada herd at Ottawa were serologically typed for the BoLA-A locus. Of the 37 serologically defined specificities, only 10 were present in Holstein cows. A gene substitution model, which included the effect of BoLA alleles and the breeding value of the sire as a covariant, was used to evaluate the association between these genes and lifetime yields and profitability. Allele A14 was significantly (P < 0.05) associated with increased lifetime milk, protein and lactose yields as well as greater milk value and annualized discounted net returns. Therefore, the potential may exist for increasing the lifetime yields and profitability in dairy cattle using genes of the BoLA-A locus. Key words: BoLA, lifetime yields, profitability, Holstein

PRODUCTION TRAITS OF RED AND WHITE RELATIVE TO BLACK AND WHITE HOLSTEINS

1988 ◽  
Vol 68 (1) ◽  
pp. 299-303
Author(s):  
P. G. SULLIVAN ◽  
J. W. WILTON ◽  
B. J. VAN DOORMAAL
Keyword(s):  
Milk Fat ◽  
Milk Protein ◽  
Dairy Production ◽  
Production Traits ◽  
Black And White ◽  
Genetic Overlap ◽  
Fat Yield ◽  
And Performance ◽  
Genetic Evaluations ◽  
Genetic Trends

Canadian red and white (RW) and black and white (BW) Holsteins were compared for several production traits based on genetic evaluations of 32 RW and 883 BW bulls, and performance data of 4161 RW and 8691 BW cows. Differences (P < 0.05), favoring BW, were observed for milk and milk fat yield of cows, and for milk fat and milk protein yield evaluations of bulls. There was, however, a large genetic overlap between the populations for all traits studied. Pleiotropic effects associated with the color gene were not detected as being important. Phenotypic trends for milk yield, milk fat yield, and milk fat percent were significantly greater for BW than RW cows (P < 0.01). Genetic trends were greater for RW cows, though not significantly (P > 0.05). Key words: Dairy production, genetic trends, Holstein (red and white), Holstein (black and white)

scholarly journals SIRE-SON CORRELATIONS OF GENETIC EVALUATIONS FOR FAT PERCENTAGE IN HOLSTEIN-FRIESIANS

1987 ◽  
Vol 67 (3) ◽  
pp. 631-635 ◽  
Author(s):  
T. E. ALI ◽  
L. R. SCHAEFFER
Keyword(s):  
Key Words ◽  
Artificial Insemination ◽  
Milk Fat ◽  
Genetic Parameters ◽  
Direct Calculation ◽  
Fat Percentage ◽  
Low Correlation ◽  
Fat Yield ◽  
Genetic Evaluations ◽  
Selection Of

The correlation between sire and son genetic evaluations for fat percentage has been shown to be lower than corresponding correlations for milk or fat yield for the population of bulls in artificial insemination. The purpose of this study was to determine the cause of this low correlation. Based on 302 935 first-lactation daughters of 11 396 sires, the heritabilities of milk, fat and fat percentage were 0.28, 0.27 and 0.52, respectively. Indirect versus direct calculation of sire evluations for fat percentage were correlated at 0.997, and resulting sire-son correlations were 0.45 for directly calculated proofs and 0.43 for indirectly calculated proofs. The low sire-son correlations were due to the intense selection of sires of sons, especially for fat percentage, which resulted in a change in genetic parameters among the bulls used as sires of sons compared to the parameters in the overall population. Key words: Fat percentage, pedigree indexing, dairy sires

scholarly journals The effectiveness of genomic selection for milk production traits of Holstein dairy cattle

2020 ◽  
Vol 33 (3) ◽  
pp. 382-389 ◽  
Author(s):  
Yun-Mi Lee ◽  
Chang-Gwon Dang ◽  
Mohammad Z. Alam ◽  
You-Sam Kim ◽  
Kwang-Hyeon Cho ◽  
...  
Keyword(s):  
Genomic Selection ◽  
Milk Production ◽  
Genetic Gain ◽  
Milk Fat ◽  
Breeding Value ◽  
Production Traits ◽  
Milk Production Traits ◽  
Data Set ◽  
Selection For ◽  
Estimated Breeding Value

Objective: This study was conducted to test the efficiency of genomic selection for milk production traits in a Korean Holstein cattle population.Methods: A total of 506,481 milk production records from 293,855 animals (2,090 heads with single nucleotide polymorphism information) were used to estimate breeding value by single step best linear unbiased prediction.Results: The heritability estimates for milk, fat, and protein yields in the first parity were 0.28, 0.26, and 0.23, respectively. As the parity increased, the heritability decreased for all milk production traits. The estimated generation intervals of sire for the production of bulls (L<sub>SB</sub>) and that for the production of cows (L<sub>SC</sub>) were 7.9 and 8.1 years, respectively, and the estimated generation intervals of dams for the production of bulls (L<sub>DB</sub>) and cows (L<sub>DC</sub>) were 4.9 and 4.2 years, respectively. In the overall data set, the reliability of genomic estimated breeding value (GEBV) increased by 9% on average over that of estimated breeding value (EBV), and increased by 7% in cows with test records, about 4% in bulls with progeny records, and 13% in heifers without test records. The difference in the reliability between GEBV and EBV was especially significant for the data from young bulls, i.e. 17% on average for milk (39% vs 22%), fat (39% vs 22%), and protein (37% vs 22%) yields, respectively. When selected for the milk yield using GEBV, the genetic gain increased about 7.1% over the gain with the EBV in the cows with test records, and by 2.9% in bulls with progeny records, while the genetic gain increased by about 24.2% in heifers without test records and by 35% in young bulls without progeny records.Conclusion: More genetic gains can be expected through the use of GEBV than EBV, and genomic selection was more effective in the selection of young bulls and heifers without test records.

THE EFFECT OF KAPPA-AND BETA-CASEIN GENOTYPES ON BREEDING VALUES OF MILK PRODUCTION TRAITS IN HOLSTEIN SIRES ORIGINATED IN MOSCOW REGION

2021 ◽  
pp. 5-10
Author(s):  
В. ФИЛИПЕНКОВА Г ◽  
А. СЕРМЯГИН А ◽  
И.Н. ЯНЧУКОВ ◽  
Н. ЕРМИЛОВ А ◽  
С. ДЕЛЯН А
Keyword(s):  
Milk Fat ◽  
Considerable Effect ◽  
Moscow Region ◽  
Breeding Value ◽  
Dairy Production ◽  
Production Traits ◽  
Milk Production Traits ◽  
Anova Analysis ◽  
Milk Protein Genes ◽  
Beta Casein

Проведены исследования на 103 быках-производителях голштинской породы черно- и красно-пестрой масти Московской области, оцененных методами BLUP и GBLUP. Производителей разделили на 3 группы в зависимости от года их рождения (г. р.): до 2005 г. р. (n=18), с 2006 по 2010 г. р. (n=34) и с 2011 по 2013 г. р. (n=51). Интерес представляло изучение генотипов по генам каппа- (κ-CSN) и бета-казеина (β- CSN), потенциально связанных с повышенным содержанием белка и продуцированием коровами «гипоаллергенного» молока А2. Однофакторный дисперсионный анализ показал значимое влияние генотипа по гену κ-CSN (P<0,001) и тенденцию для β-CSN на изучаемые показатели племенной ценности голштинских быков. Установлено, что носители генотипа BB гена CSN3 имеют превосходство в сравнении с животными, имеющими генотип АА, по количеству молочного жира и белка в молоке – на 16,8 кг и 13,2 кг соответственно, что важно при производстве молочных продуктов. Встречаемость у исследуемых быков-производителей генотипов А2А2 по гену бета-казеина (n=41) имеет большую численность в сравнении с А1А1 (n=21), что подразумевает возможным формирование специализированного стада для получения молока А2 путем группировки животных по результатам генотипирования. По мере накопления результатов оценки быков-производителей по качеству потомства, исследования в направлении изучения влияния генотипов по генам белков молока будут продолжены. The main purpose of this article was to study kappa-and beta-casein genotypes significantly associated with an increased protein content and the production of «hypoallergenic» 2A milk. The study involved 103 Black and Red-and-White Holsteins in Moscow region estimated by BLUP and GBLUP procedures. In order to evaluate the effectiveness of the study Holstein sires were selected into three groups according to their age (born in 2005) (n=18), from 2006 to 2010 (n=34) and from 2011 to 2013 (n=51). The ANOVA analysis showed a considerable effect of the genotype for the k-CSN gene (P<0,001) and the trend for β-CSN on the studied traits of breeding value of Holsteins. The highest performance in terms of amount of milk fat and protein showed that the cows with CSN3 BB group had a significant advantage in comparison with the cows of AA genotype by 16.8 kg and 13.2 kg, respectively, which is important in the dairy production. The frequency of the occurrence of homozygotes of A2A2 beta-casein (n=41) in the cows was the highest amounting in comparison with the A1A1 genotype (n=21) which implies that it is possible to form a specialized herd for obtaining A2 milk by grouping animals according to the results of genotyping. As the results of assessment of the sires’ breeding value accumulate, the study of the effect of genotypes on the milk protein genes will be pursued.

EVALUATION OF THE BREEDING VALUE AND GENETIC POTENTIAL OF THE STUD BULLS USED IN THE STUD FARM

2021 ◽  
pp. 26-31
Author(s):  
И.С. ЛИБЕТ ◽  
Н.П. СУДАРЕВ ◽  
Д. АБЫЛКАСЫМОВ ◽  
О.В. АБРАМПАЛЬСКАЯ
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Mass Fraction ◽  
Total Yield ◽  
Breeding Value ◽  
Cattle Breeding ◽  
Genetic Potential ◽  
Dairy Cattle Breeding ◽  
Fat Yield ◽  
Selective Process

Определена племенная ценность и генетический потенциал 21 быка-производителя голштинской породы, используемого в стаде племенного завода Тверской области, где проводилась их ранговая оценка по ряду селекционных признаков. Удой дочерей оцениваемых быков 8700—10804 кг молока с массовой долей жира от 3,81 до 3,95% и выходом молочного жира — 346,4—414,9 кг. Белок в молоке у дочерей разных производителей был на одном уровне — от 3,17 до 3,19%. По суммарному выходу молочного белка из-за колебаний в удое, размах признака варьировал от 279 до 344 кг. Племенная ценность (ПЦ) быков по удою составила 91,6—113,3%, 13 из них имели ПЦ ниже 100%, 8 голов — выше 100%. ПЦ по массовой доле жира равнялась 97,7—100,3%, по массовой доле белка — 99,6—100,3%. Суммарная ранговая оценка производителей по сочетаемости признаков их дочерей и женских предков показала, что бык АльтаПилснер 70344827 имеет явное преимущество по ПЦ перед другими производителями, его интегрированный коэффициент связи самый высокий и составляет — 0,78. Производитель Тач 69774799, напротив, занимает последнее место. Дана экономическая оценка использования производителей. Полученные материалы позволяют обеспечить положительную динамику селекционного процесса в молочном скотоводстве. The breeding value and genetic potential of 21 Holstein-stud bulls used in the herd of the stud farm of the Tver region were determined, where they were ranked according to a number of selectional features. The milk yield of the daughters of the evaluated bulls is 8700—10804 kg of milk with a mass fraction of fat from 3.81 to 3.95% and a milk fat yield of 346.4—414.9 kg. The protein in the milk of the daughters of different studs was at the same level-from 3.17 to 3.19%. According to the total yield of milk protein due to fluctuations in milk yield, the range of the trait varied from 279 to 344 kg. The breeding value (BV) of bulls according to the milk yield was 91.6—113.3%, 13 of them had a BV below 100%, 8 heads - above 100%. The BV for the mass fraction of fat was equal 97.7-100.3%, for the mass fraction of protein - 99.6-100.3%. The total ranking of the studs by the combination of the characteristics of their daughters and female ancestors demonstrated that the Altapilsner bull 70344827 has a clear advantage in BV over other studs, its integrated coupling coefficient is the highest and amounts 0.78. Tach 69774799 stud, on the contrary, takes the last place. There is given the economic evaluation of the studs usage. The obtained materials allow to ensure the positive dynamics of the selective process in dairy cattle breeding.

Study on candidate genes for milk production traits of Red Chittagong Cattle

2020 ◽  
Vol 26 (1-2) ◽  
pp. 1-7
Author(s):  
MP Mostari ◽  
MYA Khan
Keyword(s):  
Candidate Genes ◽  
Milk Production ◽  
Milk Fat ◽  
Nucleotide Polymorphisms ◽  
Production Traits ◽  
Milk Production Traits ◽  
Single Nucleotide ◽  
Lactating Cows ◽  
Pooled Dna ◽  
Fat Yield

The study was carried out on Stearoyl-CoA desaturase (SCD,) diacylglycerolacyltransferase-1 (DGAT1) and ATP-binding cassette G2 (ABCG2) genes which are responsible for variation in milk production traits (milk yield, fat yield, protein yield, and SNF yield) in cattle. These genes were used as candidate genes in Red Chittagong Cattle (RCC) breed of Bangladesh Livestock Research Institute (BLRI) herd for detection of single nucleotide polymorphisms (SNPs) causing variation in milk production traits. Focusing on the effects of SNPs on milk production traits, phenotypic variation within RCC breed was identified and categorized based on milk production traits. Average lactation yield varied from 527 to 1436 kg (n=29) per lactation. About 18% of lactating cows showed an average of >1000 kg per lactation. Average fat percent ranged from 4.71 to 6.25 (n=15). Eighteen (18) set of primers were designed to amplify targeted regions of SCD, DGAT1 and ABCG2 genes, where 8 set from DGAT1, 6 set from SCD and 4 set from ABCG2 gene. Pooled DNA from 50 RCC cows and 5 RCC bulls were used in sequencing. In sequence analysis, the SCD, DGAT1 and ABCG2 alleles found fixed in RCC. This study suggests an evidence that RCC breed has fixed alleles with respect to SCD, DGAT1 and ABCG2 genes reported to be responsible for higher milk fat yield, higher fat and protein percent. Bang. J. Livs. Res. Vol. 26 (1&2), 2019: P. 1-7

Genetic parameters of milk cholesterol content in Holstein cattle

2018 ◽  
Vol 98 (4) ◽  
pp. 714-722 ◽  
Author(s):  
Duy N. Do ◽  
Allison Fleming ◽  
Flavio S. Schenkel ◽  
Filippo Miglior ◽  
Xin Zhao ◽  
...  
Keyword(s):  
Milk Fat ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Cholesterol Content ◽  
Production Traits ◽  
Fat Percentage ◽  
Bivariate Models ◽  
Estimate Heritability ◽  
Fat Yield ◽  
Using Data

This study aimed to estimate heritability for milk cholesterol (CHL) and genetic correlations between milk CHL and other production traits (test-day milk, fat, and protein yields, fat and protein percentages, and somatic cell score). Milk CHL content was determined by gas chromatography and expressed as mg of CHL in 100 g of fat (CHL_fat) or in 100 mg of milk (CHL_milk). Univariate models were used to estimate variances and heritability, whereas bivariate models were used to compute correlations using data from 1793 cows. The average concentrations (standard deviation) of CHL_fat and CHL_milk were 275.63 (75) mg and 11.16 (3.63) mg, respectively. Milk CHL content was significantly affected by days in milk and herd (P < 0.05), but not by parity, regardless of the scale of expression. Heritability estimates for CHL_fat and CHL_milk were 0.06 ± 0.04 and 0.17 ± 0.06, respectively. Phenotypic and genetic correlations between CHL_fat and CHL_milk were 0.82 and 0.44 ± 0.24, respectively. CHL_fat had nonsignificant genetic correlations with all production traits, whereas CHL_milk had significant (P < 0.05) genetic correlations with milk yield (−0.47), fat yield (0.51), protein percentage (0.56), and fat percentage (0.88). This is the first study to estimate genetic parameters for milk CHL content. Further studies are required to assess the possibility of genetically selecting cows with lower milk CHL content.

scholarly journals Association of Bovine Lymphocyte Antigens with Milk Fat Percentage Differences

1986 ◽  
Vol 69 (12) ◽  
pp. 3148-3150 ◽  
Author(s):  
H.C. Hines ◽  
F.R. Allaire ◽  
Michelle M. Michalak
Keyword(s):  
Milk Fat ◽  
Fat Percentage ◽  
Bovine Lymphocyte ◽  
Lymphocyte Antigens

EFFECT OF HERD-YEAR PRODUCTION LEVEL ON EXPRESSION OF SIRE MERIT

1990 ◽  
Vol 70 (2) ◽  
pp. 383-388
Author(s):  
P. L. McEWEN ◽  
A. WINKELMAN
Keyword(s):  
Regression Analysis ◽  
Key Words ◽  
Regression Coefficients ◽  
Group Differences ◽  
Production Traits ◽  
Fat Percentage ◽  
Sire Group ◽  
Fat Yield ◽  
Linear Contrasts ◽  
Dairy Sire

Performance data on 110 602 first lactation Holstein cows were utilized to compare the expressions of sire proof at various herd-year production levels. Production traits analyzed were BCA milk, BCA fat and fat percentage. Herd-year averages were partitioned into six groups for each trait. Regression analysis indicated significant interactions between herd-year level and sire estimated transmitting ability (ETA) for daughter milk and fat BCA (P < 0.001). Interaction between herd group and sire proof for fat percentage was found to be insignificant. Linear contrasts were used to compare sire proof slope differences for various herd-year group comparisons. Regression coefficients for sire proof tended to increase as herd-year level increased for both milk and fat yield. The coefficient for sire fat percentage was smaller for the lowest herd-year level when compared to other herd levels. Sire proofs for milk and fat were than categorized into six and seven groups respectively. Sire group and herd-year by sire group interaction were found to account for a significant (P < 0.01) amount of variation in daughter milk and fat yield. Linear contrasts were also used to compare specific sire group differences at various herd production levels. Significant herd-year differences were observed for both daughter milk and fat yield. However specific trends were not prevalent for sire group differences as herd-year groups increased for both traits. Key words: Dairy, sire, daughter

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