@conference {40809,
	title = {Repeatabilities of blood plasma metabolites and their associations with leanness in genotypes showing a wide divergence in carcass composition},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {56},
	year = {1996},
	month = {Jan},
	pages = {180-183},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Strain differences in lean : fat partitioning were typified by a marked  contrast in a lean growth index giving equal but opposite emphasis to the  weights of protein and fat, in line with previous publications. Strains  showed characteristic differences in blood metabolites which did not  necessarily reflect genetic variations within a strain and correlated responses  to within-breed selection for changes in body composition. High repeatabilities of blood metabolites within a strain were found for  pasture-fed lambs aged between 5 and 14 months for samples collected on  the same day following overnight fasts of 20 vs 24 hours, but were lower for  samples taken from fasted animals at different ages. Between-age within- strain repeatabilities (averaged across two trials) were moderate for plasma  urea (0.24) creatinine (0.38) and non-esterified fatty acids (0.18), but low for  beta-hydroxybutyrate (0.09). Similar moderate heritability estimates were  found for urea and creatinine. Although standard errors were very high for  this small dataset based on only 12 sires, estimates for carcass composition  were in broad agreement with other more reliable published values. Also in  line with other results, sire-progeny variations in urea and beta- hydroxybutyrate were more positively related to carcass protein than carcass  fat, while the reverse was true for creatinine. Metabolically contrasting pairs  of metabolites showed potentially useful predictive associations with sire- progeny variations in protein:fat partitioning.},
	issn = {1176-5283},
	author = {Clarke JN and Binnie DB and Dobbie JL and Jones KR and Mowat CM and Purchas RW and Uljee AE}
}
