@conference {40360,
	title = {Short term intake of Friesian heifers grazing three pasture species},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {465-468},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Objective measures of muscularity were calculated for 1602  Romney and Romney-cross carcasses which were the progeny of 102 sires.  Muscularity was defined as a measure of muscle thickness relative to  carcass length. Phenotypic and genetic parameters were calculated from  REML estimates of variance and covariance components. Different  measures of muscularity had genetic correlations with one another  between .48 and .84 and phenotypic correlations between .30 and .62.  Measures of muscularity and high heritability (.40 to .68), positive  genetic correlations with weight of carcass lean (.32 to .53) and  carcass weight (.08 to .32) and negative genetic correlations with  carcass fat (-.06 to -.33), and carcass length (-.11 to -.30). Single  trait selection on muscularity was expected to result in increased lean  and decreased fat. Selection on some of the muscularity measures was  expected to result in increased subcutaneous fat. When the breeding  objective gave positive emphasis to lean weight and negative emphasis to  fat weight and the selection criteria were carcass weight and a  muscularity measure, the muscularity measure that gave the greatest  economic response to selection was that which used the longissimum  muscle width (A) as a measure of muscle thickness.  },
	issn = {1176-5283},
	author = {Elliott AW and Hughes TP}
}
