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Journal of Dairy Science Vol. 74 No. 2 651-664
© 1991 by American Dairy Science Association ®
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Response to Selection of United States Holstein Sires in Latin America

T. L. Stanton 1, R. W. Blake 1, R. L. Quaas 1, and L. D. van Meck 2

1 Department of Animal Science, Cornell University, Ithaca, NY 14853-4801
2 ARS, Roman L Hruska Meat Animal Research Center, A218 Animal Sciences, University of Nebraska, Lincoln 68583-0908

Milk yield was regressed on sire PD for 28,755, 65,990, and 30,279 sire identified records from Colombia, Mexico, and Puerto Rico. Milk yields were expressed as daughter herd-year deviations for projected or actual 305-d milk yield after adjustments for age and season of calving. Herd-year means and standard deviations were determined using all cows in a herd-year including those with unknown sires. Average herd-year mean and SD were less for Colombia and Puerto Rico than for Mexico. Average herd-year SD within same herd-year mean classification also were smaller for Colombia and Puerto Rico compared to Mexico. Coefficients for daughter milk response regressed on sire PD were similar in Colombia (.31 ± .02) and Puerto Rico (.32 ± .02) and greater in Mexico (.54 ± .02). Daughter responses increased similarly and approximately linearly with increasing herd-year SD in each country but not with increasing herd-year mean. Daughter milk response to sire selection was less than reported responses in US herds with similar herd-year means and SD. Therefore, using sire PTA estimated from US daughters will overestimate milk responses of daughters in Latin American dairy herd environments.

Key Words: selection response • milk yield • Latin America

Submitted on April 9, 1990
Accepted on August 10, 1990




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Copyright © 1991 by the American Dairy Science Association ®.