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Journal of Dairy Science Vol. 64 No. 5 832-837
© 1981 by American Dairy Science Association ®
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Comparison of Single and Multiple-Trait selected Sires. Response in Mastitis Traits.1,2,

R. H. Miller, R. E. Pearson3, M. F. Rothschild4 and L. A. Fulton

Milk Secretion and Mastitis Laboratory, Animal Science Institute, US Department of Agriculture, Beltsville, MD 20705

ABSTRACT

Estimated somatic cell counts and incidence of clinical mastitis were measured on 163 daughters of two groups of bulls selected by two alternative criteria. Yield bulls were selected solely on progeny test for milk in first lactation; Merit bulls were selected by independent culling levels on fat-corrected milk yield, percent daughters culled in first lactation, and udder type conformation of daughters. Daughters of Yield sires exceeded daughters of Merit sires by 685 kg milk in first lactation. Groups did not differ significantly in measures of clinical mastitis or in measures of estimated cell counts of milk. Also, groups did not differ in kilograms milk discarded because of antibiotic treatment for mastitis, in spite of the large difference in total milk yield. Mean milk discarded per lactation completed was 171 kg, representing 64,243, and 207 kg for parities one, two, and three.

FOOTNOTES

1 Scientific Article No. A2825, Contribution No. 5875 of the Maryland Agricultural Experiment Station, Department of Dairy Science.

2 Contribution jointly to NC-2 Regional Project "Improving Dairy Cattle through Breeding with Special Emphasis on Selection" and to S-49 Regionnal Project "Genetic Methods of Improving Dairy Cattle for the South."

3 Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg, 24061.

4 Department of Animal Science, Iowa State University, Ames, 50011.






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