@conference {40340,
	title = {Fleece production responses to Merino fine wool index selection},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {353-358},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Two N.Z. sets of phenotypic and genetic parameters were used to  compare expected genetic responses from index selection for an economic  breeding objective favouring the lean and penalising the fat content of  lamb carcasses. The effect of different economic values for lean  relative to fat were examined over the range corresponding to the  {\textquoteright}biological{\textquoteright} objectives, weight-adjusted fat and lean growth rate.  Particular attention was given to the magnitude and direction of  responses in lean and fat. Increasing the economic emphasis on lean  relative to fat progressively increased the lean response but was  associated with an increasing fat response in an undesirable direction.  Different measures of carcass fatness varied in their ability to  discriminate among genes affecting fat and lean differentially when  included in a selection index along with growth rate, and were superior  to eye muscle depth. Good estimates of the relative economic values are  required for derivation of optimum selection strategies, especially if  indexes of low discriminating power are to be used for selection.  },
	issn = {1176-5283},
	author = {Wuliji T and Dodds KG and Land JTJ}
}
