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Relationship Between Blood Type and Predicted Differences in Production of Holstein Sires in Artificial Insemination^{1, 2,}

Department of Dairy Science, The Ohio State University; The Ohio Agricultural Research and Development Center, Columbus; DCRB, USDA, Beltsville, Maryland

ABSTRACT

The blood antigen types and estimates of transmitting ability for production (USDA Predicted Difference) were compared for 1,582 Holstein bulls. All blood-typed bulls which had Predicted Differences (PD) for 50 or more daughters listed in the USDA Sire Summaries were included. These bulls had 804,195 daughters, averaging 508 daughters per bull. Analyses between eight blood polymorphic systems (A, B, F, J, L, M, S, and Z) and the PD estimates of breeding merit were conducted. In analyses within families of paternal half-brothers, both the B and L systems were related (P < .01) to PD for milk. The probability increased but was still less than .05 after adjustments were made for sire families and other blood systems. In the B system, the constant for the BO₁Y₂D' phenogroup was 305 ± 118 kg milk higher than the constant for the O_xE₃'G'O' phenogroup when the 20 most frequent phenogroups were considered. Milk production of females by bulls which did not have L exceeded the production of females which were sired by bulls having L by 55 ± 27 kg.

¹ A contribution from the NC-2 Dairy Cattle Breeding Project in cooperation with Dairy Genetics and Breeding Section, DCRB, USDA, Beltsville, Maryland.

² A project conducted in cooperation with the Holstein-Friesian Association of America, Brattleboro, Vermont.