The normal lactation curve for milk and its components is described as well as the influence of nongenetic factors on different lactation stages. The shape of the lactation curve is under genetic and environmental influence. Genetic correlation between monthly yields or part lactations of varying length are high but lower than 1.0. In selection parts of the lactation yielding equally high or higher progress than 305-day yield can be choosen. Selection on first part of the lactation might give undesirable changes in the shape of the lactation curve. Bias from culling of cows and problems in handling lactations of various length is discussed.

B. Danell

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 114–117, 1990
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