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Altering milk composition through genetic selection.

J P Gibson1

  • 1Department of Animal and Poultry Science, University of Guelph, Ontario, Canada.

Journal of Dairy Science
|October 1, 1989
PubMed
Summary
This summary is machine-generated.

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Genetic selection can alter milk composition, including fat and protein content, driven by economic incentives. Focusing on component yields, rather than concentrations, is key for effective genetic improvement in dairy animals.

Area of Science:

  • Animal Breeding and Genetics
  • Dairy Science
  • Quantitative Genetics

Background:

  • Understanding genetic correlations between milk components is crucial for effective breeding programs.
  • Economic drivers significantly influence the feasibility and direction of genetic alterations in milk composition.

Purpose of the Study:

  • To analyze the genetic relationships among milk fat, protein, and lactose concentrations and yields.
  • To evaluate the potential for genetic improvement in milk composition based on economic values and genetic parameters.

Main Methods:

  • Analysis of genetic parameters and correlations between milk fat, protein, and lactose.
  • Modeling the impact of economic incentives on genetic selection strategies for milk composition.

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Main Results:

  • Genetic alteration in milk composition is feasible, with fat:protein ratio changes being particularly rapid, mainly via fat concentration.
  • Economic values should prioritize component yields over concentrations for optimal selection pressure.
  • Fat and protein yields and concentrations, along with the fat:protein ratio, are expected to increase under typical economic scenarios.

Conclusions:

  • Genetic selection can effectively modify milk composition, provided clear economic incentives exist.
  • Reassessment of selection indexes is necessary, considering recent advancements in deriving economic weights.
  • Lactose concentration is unlikely to change significantly, and variations in fat/protein composition are of minor genetic improvement importance.