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Adjustment for heterogeneity of variance for milk yield of Holstein-Friesian cows in Minas Gerais State



Adjustment for heterogeneity of variance for milk yield of Holstein-Friesian cows in Minas Gerais State



Revista Brasileira de Zootecnia 31(1 Suppl.): 369-375



A method was used to account for heterogeneous phenotypic variance for milk yield across herds and over time based on variance for each herd-year class in the genetic evaluation of Holstein-Friesian cows in Minas Gerais State, Brazil. Phenotypic variances increased twice as within subclass averages increased from 4000 to 10 000 kg and also with increases in subclass size. Data were standardized to a common variance and the breeding values obtained before and after adjustment were compared.

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Accession: 003634132

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