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Related Experiment Videos

A covariance function for feed intake, live weight, and milk yield estimated using a random regression model.

R F Veerkamp1, R Thompson

  • 1Department of Animal Breeding and Genetics, DLO-Institute for Animal Science and Health, Lelystad, The Netherlands.

Journal of Dairy Science
|July 23, 1999
PubMed
Summary

Genetic variation in feed intake, live weight, and milk yield in early lactation heifers was analyzed. Selection strategies must consider trait measurement timing for optimal energy balance and efficiency.

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Area of Science:

  • Animal Genetics
  • Dairy Science
  • Reproductive Biology

Background:

  • Understanding genetic variation in early lactation is crucial for dairy cattle breeding.
  • Feed intake, live weight, and milk yield are key traits influencing dairy cow efficiency.

Purpose of the Study:

  • To investigate genetic covariances among feed intake, live weight, and milk yield in heifers during early lactation.
  • To model genetic variation using multitrait covariance functions and random regression models.

Main Methods:

  • Utilized multitrait covariance functions to analyze genetic covariances.
  • Employed random regression models to estimate genetic and permanent environmental effects.
  • Applied polynomial functions (second or third order) to model genetic variation.

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Main Results:

  • High milk yield moderately correlated with feed intake (0.21) but strongly with increased intake and live weight loss.
  • Strong correlation (0.81) observed between live weight and feed intake levels.
  • Genetic correlations between week 1 and 15: milk yield (0.62), dry matter intake (0.24), live weight (0.79).
  • Early lactation feed intake negatively correlated with milk yield; later weeks showed positive correlation.

Conclusions:

  • Selection for milk yield, feed intake, and live weight requires consideration of measurement timing during lactation.
  • Optimal selection for energy balance and efficiency necessitates a nuanced approach to trait assessment across lactation stages.