Academic
Publications
Method R Estimates of Heritability for Milk, Fat, and Protein Yields of United States Dairy Cattle

Method R Estimates of Heritability for Milk, Fat, and Protein Yields of United States Dairy Cattle,10.3168/jds.S0022-0302(99)75470-6,Journal of Dairy

Method R Estimates of Heritability for Milk, Fat, and Protein Yields of United States Dairy Cattle   (Citations: 14)
BibTex | RIS | RefWorks Download
Heritabilities for milk, fat, and protein yields were estimated from first lactation data used for USDA- Dairy Herd Improvement Association (DHIA) genetic evaluations. Contemporary group assignments and standard deviations within herd-year were determined with the procedure used for national evaluations. Pedi- gree data were included for animals born since 1970; yield data were included for cows born since 1980. Lac- tation records were divided into four mutually exclusive data sets based on standard deviations. Ranges for standard deviations were chosen so that data sets were approximately equal in size. Method R was used to estimate heritability with 25 different random samples of half of the data for each data set. Because of the large number of Holstein observations, estimates of her- itability for Holsteins were based on random subsets of the complete data file; each subset included approxi- mately 5% of the data. Mean heritability estimates in- creased with standard deviations, and estimates ranged from 0.18 to 0.51 across breeds. Repeatability estimates for milk yield of Holsteins were approxi- mately 0.50 and did not change with standard devia- tion. These heritability estimates were higher than those previously used in the USDA-DHIA genetic evalu- ation. Heritability used in the USDA-DHIA genetic
Journal: Journal of Dairy Science - J DAIRY SCI , vol. 82, no. 10, pp. 2231-2237, 1999
Cumulative Annual
View Publication
The following links allow you to view full publications. These links are maintained by other sources not affiliated with Microsoft Academic Search.
    • ...Heritability for yield varies among herds differing in characteristics such as mean milk production, phenotypic variance for yield, herd size, percentage of cows that are registered, average age at first calving, and region of the country (Van Vleck, 1970; Norman et al., 1972; Lofgren et al., 1985; Vinson, 1987; Dimov et al., 1995; Van Tassell et al., 1999; Zwald et al., 2003; Dechow and Norman, 2007)...

    C. D. Dechowet al. Relationship Between Individual Herd-Heritability Estimates and Sire M...

    • ...dency toward higher heritability estimates as phenotypic variance increases (Lofgren et al., 1985; Vinson, 1987; Van Tassell et al., 1999)...

    C. D. Dechowet al. Short Communication: Variance Estimates Among Herds Stratified by Indi...

    • ...Freeman-Gallant & Rothstein 1999; Van Tassell et al. 1999; Merila ¨ & Sheldon 2000; Hunt & Simmons 2002; McAdam et al. 2002; Rauter & Moore 2002; MacColl & Hatchwell 2003; Sheldon et al. 2003; Wilson et al. 2005)...
    • ...High-additive genetic variance and moderate to high heritabilities for maternal characteristics appear to be common (Freeman-Gallant & Rothstein 1999; Van Tassell et al. 1999; Merila ¨ & Sheldon 2000; Hunt & Simmons 2002; McAdam et al. 2002; Rauter & Moore 2002; MacColl & Hatchwell 2003; Sheldon et al. 2003; Wilson et al. 2005) and indirect genetic effects may create complex evolutionary dynamics...

    Christine W. Milleret al. A potential resolution to the lek paradox through indirect genetic eff...

    • ...Heritability estimates typically increase as mean herd yield and herd phenotypic variance increase (Lofgren et al., 1985; Vinson, 1987; Van Tassell et al., 1999)...
    • ...Herd-year heritability for yield is assumed to increase when the standard deviation (SD) for phenotype increases (Wiggans and VanRaden, 1991) and is constrained to range from 0.25 to 0.35 in the US genetic evaluation of Holsteins (Van Tassell et al., 1999)...
    • ...Genetic and permanent environmental variances were identical to those used in national genetic evaluations, which are based on assumed heritabilities of 0.30 and repeatabilities 0.55 for yield traits (Van Tassell et al., 1999) and 0.10 and 0.35, respectively, for SCS (Schutz, 1994)...
    • ...greater phenotypic variance had higher heritability, which is consistent with other studies (Van Tassell et al., 1999)...

    C. D. Dechowet al. Within-Herd Heritability Estimated with Daughter–Parent Regression for...

    • ...Management factors contribute about 45% of the variationinmilkcomposition,andgeneticsexplain55% (Van Tassell et al., 1999)...
    • ...Milk yield is positively correlated to yield of milk fat and protein; however, milk yield is negatively correlated to milk fat and protein percentage (Welper and Freeman,1992).Heritabilitiesformilkyieldrangefrom 0.32 to 0.40 for Holsteins and 0.38 to 0.48 for Jerseys (Van Tassell et al., 1999)...
    • ...Heritabilities for milk fat and protein yield range from 0.33 to 0.36 and 0.25 to 0.36 for Holsteins and 0.31 to 0.37 and 0.32 to 0.42 for Jerseys (Van Tassell et al., 1999)...

    K. W. Baileyet al. Economic Returns to Holstein and Jersey Herds Under Multiple Component...

Sort by: