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Sire by Herd Interaction in Production Traits in Dairy Cattle¹

North Carolina State College, Raleigh

J. F. Kendrick

Dairy Husbandry Research Branch, Agricultural Research Service, USDA, Washington, D. C.

ABSTRACT

The environment that should be provided breeding populations under selection has received much discussion (6, 7, 12), but little evidence has been available upon which to base decisions or recommendations. Although many would argue that selection should be practiced in an environment comparable to the one in which the strain or breed is expected to perform, Hammond (7) has subscribed to the thesis that the environment provided should be the one that permits the maximum expression of the trait being selected. In addition to other considerations, Hammond's suggestion might be viewed in the light of possible hereditary-environmental interactions if the individuals are to perform in an environment differing greatly from the test environment. Falconer (3) has denned this problem where the choice of only two alternative environments is concerned, but the general problem defies such simple characterization and seemingly demands an examination of the actual situation for a large sample of genotypes and environments.

¹ Published with the approval of the Director of Research, North Carolina Agricultural Experiment Station, Raleigh, as Paper No. 685 of the Journal Series.