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Some Effects of Certain Environmental and Inherited Influences upon Milk and Fat Production in Dairy Cattle^1,2,

Dairy Department, University of Georgia, Athens

ABSTRACT

The IBM-DHIA records of 2,364 cows of four breeds were analyzed to study the effects of breed, season of calving, gestation, preceding dry period, and body weight upon milk, FCM, and butterfat production in southeastern United States. The total regressions for milk, FCM, and fat were highly significant due to the combined effects of the five variables with R² values of 40.5, 31.0, and 24.9%, respectively.

Partial regressions of FCM and fat yield on season of calving, gestation, and body weight were significant. The effect of the length of preceding dry period in this study was negligible. Breed differences accounted for 11% of the variation in milk production, 7.4% of the variation in FCM production, but only 3.7% of the variation in fat yield.

¹ These data were taken from a thesis presented by the senior author to the Graduate School of the University of Geogria in partial fulfillment of the requirement for a Master of Science Degree.

² Journal Paper No. 137 of the College Experiment Station of the University of Georgia College of Agriculture Experiment Stations.