Response within Herd to Sire Selection

Improving the Herd Management Using Genomic Information Improving within-herd selection

Genomic selection (GS) as theoretically introduced by Meuwissen et al. (2001) has been successfully implemented worldwide in dairy cattle breeding programs reflecting large populations, i.e., Holsteins, Fleckvieh, Jersey, and Brown Swiss, and has revolutionized conventional breeding schemes. Revolution of dairy cattle breeding programs via GS was the logical consequence due to the obvious possi...

Relationship between individual herd-heritability estimates and sire misidentification rate.

The objectives of this study were to estimate heritabilities within herds participating in Dairy Herd Improvement and determine the relationship of the individual herd heritability with sire misidentification rate. Individual herd heritabilities for milk, fat, and protein yield and somatic cell score (SCS) were calculated with daughter-dam regression and daughter-sire predicted transmitting abi...

Sire x herd interactions for weaning weight in beef cattle.

Weaning weight records of 44,357 Australian Angus calves produced by 1,020 sires in 90 herds were used to evaluate the importance of sire x herd interactions. Models fitted fixed effects of contemporary group (herd-year-date of weighing subclass), sex, calf age, and dam age and random effects of sire or of sire and sire x herd interaction using REML. Effects of standardizing the data, including...

The Importance of Sire Selection

Effect of variance of interaction effects of sire and herd on selection for milk and fat yield.

The animal model for genetic evaluations of dairy cattle by the USDA currently includes a term for interaction effects of sire and herd. The relative magnitude of the variance of that effect was established in the 1960s as 14% of the total variance, but recent research has shown that the proportion is 2% or less. This report compared EBV using either the 14% or the actual estimate from 20 sampl...