A Comparison of Different Selection Indices for Genetic Improvement for Milk Traits in Holstein Friesian Cattle in Turkey by Using One Standard Deviation as Relative Economic Weight

2006 ◽  
Vol 9 (2) ◽  
pp. 285-288
Author(s):  
Hulya Atil
Keyword(s):  
Standard Deviation ◽  
Genetic Improvement ◽  
Milk Traits ◽  
Economic Weight ◽  
Holstein Friesian ◽  
Selection Indices ◽  
Friesian Cattle

scholarly journals A comparison of different methods of estimating sire transmitting ability of some milk traits in a herd of Holstein Friesian cattle

2000 ◽  
Vol 43 (2) ◽  
pp. 115-122
Author(s):  
H. Atil ◽  
A. S. Khattab
Keyword(s):  
Least Squares ◽  
Milk Yield ◽  
Lactation Period ◽  
Milk Traits ◽  
Linear Unbiased Prediction ◽  
Age At First Calving ◽  
Holstein Friesian ◽  
Genetic And Phenotypic Correlations ◽  
Best Linear Unbiased ◽  
Friesian Cattle

Abstract. A total of 1931 normal first lactation records of Holstein Friesian cows kept at Dena Farm in Egypt during the period from 1987 to 1994 were used to estimate phenotypic and genetic parameters for 90 day milk yield (90 dMY), 305 day milk yield (305 dMY) and lactation period (LP). In addition, 76 bulls with at least ten daughters were used to compare three methods of sire transmitting ability. A least Squares analysis of variance show significant effect of month and year of calving and age at first calving for different traits studied, except the effect of age at first calving on LP. Heritability estimates for 90 dMY, 305 dMY and LP were 0.39 ± 0.08, 0.27 ± 0.07 and 0.14 ± 0.05, respectively. Genetic and phenotypic correlations between different traits were positive and significant. Sires with at least ten daughters were evaluated by best linear unbiased prediction (BLUP), least Squares means (LSM) and regression of the future daughters mean on the present daughters mean. The product moment correlations between different traits studied were positive and high (= 0.96).

Genetic Analysis for Milk Traits in Different Herds of Holstein Friesian Cattle in Turkey

2001 ◽  
Vol 1 (8) ◽  
pp. 737-741 ◽  
Author(s):  
Hulya Atil ◽  
A. Salah Khattab . ◽  
Cigdem Yakupoglu .
Keyword(s):  
Genetic Analysis ◽  
Milk Traits ◽  
Holstein Friesian ◽  
Friesian Cattle

The influence of BoLA-DRB3 alleles on incidence of clinical mastitis, cystic ovary disease and milk traits in Holstein Friesian cattle

2018 ◽  
Vol 45 (5) ◽  
pp. 917-923 ◽  
Author(s):  
Joanna Pokorska ◽  
Dominika Kułaj ◽  
Magdalena Dusza ◽  
Andrzej Ochrem ◽  
Joanna Makulska
Keyword(s):  
Clinical Mastitis ◽  
Milk Traits ◽  
Cystic Ovary ◽  
Holstein Friesian ◽  
Friesian Cattle

scholarly journals Genetic parameters for test-day milk yield in tropical Holstein Friesian cattle fitting a multiple-lactation random regression animal model

1970 ◽  
Vol 47 (3) ◽  
pp. 352-361
Author(s):  
S. Meseret ◽  
E. Negussie
Keyword(s):  
Animal Model ◽  
Milk Yield ◽  
Genetic Improvement ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Random Regression ◽  
Likelihood Method ◽  
Holstein Friesian ◽  
Heritability Estimates ◽  
Friesian Cattle

Accurate estimates of genetic parameters are essential for genetic improvement of milk yield in dairy cattle and for setting up breeding programmes. Estimates of genetic parameters from test-day models, particularly for Holstein Friesian cattle maintained in tropical environments, are scant in the literature. The objective of this study was therefore to estimate genetic parameters for milk yield by fitting a multiple-lactation random regression animal model (RRM) based on data from Ethiopian Holstein Friesian herds. Data were used from the first three lactations of cows that calved between 1997 and 2013. The data comprised 13 421 test-day milk yield records from 800 cows from two large dairy herds. Variance components were estimated using the average information restricted maximum likelihood method fitting an RRM. Heritability estimates for first, second, and third lactations ranged from 0.20 to 0.26, 0.15 to 0.27, and 0.17 to 0.28, respectively. Heritability estimates ranging from 0.15 to 0.28 indicate that effective genetic improvement should be accompanied by a corresponding improvement of the production environment. Across-lactation genetic correlations between first and second, second and third, and first and third lactations, expressed on a 305-day yield basis, were 0.88, 0.83, and 0.70, respectively. These genetic correlations, less than or equal to 0.88, indicate that different lactations are different traits. For an accurate evaluation of the genetic merit of animals for milk yield, lactations should be treated as different, but correlated traits in a multiple-lactation analysis.Keywords: Genetic correlation, heritability, Legendre polynomial, test-day model

EFFECTIVENESS OF SIRE PROOFS IN PREDICTING RESULTS OF CORRECTIVE MATINGS FOR CONFORMATION IN CANADIAN HOLSTEIN-FRIESIAN CATTLE

1979 ◽  
Vol 59 (2) ◽  
pp. 339-347 ◽  
Author(s):  
E. B. BURNSIDE ◽  
H. M. STEWART
Keyword(s):  
Standard Deviation ◽  
Artificial Insemination ◽  
Chi Square ◽  
Holstein Friesian ◽  
Heritability Estimates ◽  
Friesian Cattle ◽  
Type Classification ◽  
Classification Rating ◽  
Chi Square Tests

Type classification records of maternal half-sister pairs were analyzed to determine if "Superior" sires differed significantly from "Inferior" sires in their progeny distributions for each type component. "Superior" sires differed by at least one standard deviation in proofs from "Inferior" sires. The sires contrasted were 53 Holstein-Friesian bulls which entered Canadian Artificial Insemination units between 1956 and 1962. Data were analyzed separately for each component of the scorecard and for each classification rating of the dam. Chi-square tests showed highly significant (P <.01) differences in the progeny distributions for the two groups of sires. Differences were most dramatic for size, rump, body capacity and dairy character. In general, higher chi-square values were found for traits with higher heritability estimates. Correlations between sires’ proofs for conformation at the time of mating and their mates’ conformation records for major scorecard components were all positive and highly significant (P <.01) except for dairy character. This indicates that assortative matings are taking place and thus it is essential to adjust for mates of sires to generate accurate sire ratings for conformation.

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