Potential increases in productivity from selection for production traits is constrained by several factors. These include: 1) the heritabilities and genetic correlations among milk and milk components, 2) biological limits on nutrient intake, and 3) limitations resulting from decreased reproductive efficiency and/or increased health problems associated with increased milk and component yields.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 104–113, 1990
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