Genotype-Climatic and Other Interaction Effects for Productive Responses in Holsteins

Abstract

Season of calving had important effects on the shape of the lactation curve, affecting peak milk yield, persistency, and lactation lengths in a Louisiana Holstein herd. Feeding regime and age at calving also had marked effects. Plane of nutrition appeared to have more important effects on components of the lactation curve than did season of calving. Most interaction effects were small.