Romney male and female heritabilities and genetic correlations
for weaning, autumn and spring body weights and hogget fleece weights
A.C. Parratt, G.B. Nicoll and M.J. Alderton
MAFTech, Ruakura Agricultural Centre, Hamilton and Land
Corporation Ltd, PO Box 1235, Hamilton
Proceedings of the New Zealand Society of Animal Production.
1989, 49: 191-196
Often effective breeding programmes are dependent on the
assumption that heritabilities and genetic correlations between traits
are the same in both sexes and that the genetic correlation for the same
trait measured on both sexes is unity. A total of 12 302 records from
149 sire groups were analysed using mixed model techniques to test these
assumptions. The results provide an indication that genetic and
phenotypic parameters differ for male and female sheep. Cognizance of
this fact should be taken when considering alternative selection
strategies.
Keywords: NZSAPAB;
Heritabilities; genetic correlations; sex; selection strategies;
phenotypic parameters
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Last Updated 18-03-1997
