@conference {40674,
	title = {Effect of level of nutrition on age of puberty and reproductive performance of Friesian heifers},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {55},
	year = {1995},
	month = {Jan},
	pages = {79-81},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Muscle proteolysis is controlled by a number of enzyme systems. The   reported effects of the calcium dependent proteinases (or calpains) on   myofibrillar structure have led to the speculation that this enzyme system  may   have an important role in regulating muscle growth and the post mortem   ageing process. Although at present there is no clear economic incentive,   meat quality has to be taken into account since the white meats of poultry   and pork are out competing the traditional red meats of lamb and beef.   Meat quality attributes may largely depend on slaughtering and post mortem   ageing regimes, however, variability also originates from the biological   characteristics of muscles which are undoubtedly environmentally and   genetically controlled. The aim of the present experiment is to examine the   effect of genotype, nutrition and their interactions on the calpain system.    Progeny from 3 sire breeds (Texel, Fat Southdowns and Lean Southdowns)   were weaned in December and placed onto one of two growth paths until   May (high (H) or low (L) rate of gain), from May until July these groups   were further divided into groups HH, HL, LL and LH. Animals were   slaughtered at the Ruakura commercial slaughter facility, samples for calpain   analysis were taken from the distal portion of the longissimus dorsi of the   animal within 20 minutes of slaughter. The assays were performed as   outlined by Dobbie et al., (1995).    Calpain-I differed significantly (p<0.05) between genotype (Texel 0.57   SDFat 0.50 SD Lean 0.41 U/g (SED 0.060). Calpastatin was significantly   (P<0.05) affected by plane of nutrition immediately after weaning. (H:2.61   L:2.35 U/g SED 0.126).    The results taken together suggest that complex physiological interactions   exist between genotype and nutrition with respect to the calpain system.   },
	issn = {1176-5283},
	author = {Penno JW and Macmillan KL and Bryant AM}
}
