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"Experientia docet" - Experience is the best teacher

Heterogeneity of variance and its implications on dairy cattle breeding

  • 2007
  • Issue: 3
  • Volume: 37
T.K. Muasya, E.D. Ilatsia, T.M. Magothe and A.K. Kahi Page: 170 - 175

Milk yield data (n = 12307) from 116 Holstein-Friesian herds were grouped into three production environments based on mean and standard deviation of herd 305-day milk yield and evaluated for within herd variation using univariate animal model procedures. Variance components…

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The effect of heterogeneity for yearling weights measured in different test phases of the South African National Beef Cattle Imp

  • 2002
  • Issue: 3
  • Volume: 32
R.R. van der Westhuizen and T. Rust Page: 171 - 174

In animal breeding, selection decisions are often made amongst animals from separate environmental groups. Production data in these groups may differ both in mean and variance. In South Africa, yearling weights of beef cattle are recorded in two different phases…

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