New Zealand Journal of Agricultural Research abstracts
A comparison of 15 ram breeds for export lamb production
2. Proportions of export cuts and carcass class
A. H. KIRTON
A. H. CARTER1
J. N. CLARKE
D. P. SINCLAIR1
G. J. K. MERCER
D. M. DUGANZICH
AgResearch
Ruakura Agricultural Research Centre
Private Bag 3123
Hamilton, New Zealand
Abstract The proportions of cuts from 7885 lamb carcasses
sired by 15 different ram breeds, reared on pasture at two locations over 10
years, were measured and examined for breed differences. Although highly
significant breed differences were found, their magnitude was small reaching a
largest difference between crosses of 1.22% for the leg and 1.26% for the loin
compared at the same carcass weight. Compared at the same time of slaughter
(age), the maximum differences between the progeny of different ram breeds were
1.02% for the leg and 1.06% for the loin. Wether lambs had a slightly higher
proportion of forequarter cuts. Sire breed had a major effect on the proportion
of lambs reaching the fatter P grade (class) with the meat breeds Southdown,
Dorset Down, South Dorset Down, Hampshire, and South Suffolk sires producing
68-76% P carcasses and the wool breeds such as the English Leicester, Merino,
Romney, and Lincoln producing 18-23% of P carcasses. Lambs sired by the Poll
Dorset, Dorset Horn, Suffolk, Ryeland, Border Leicester, and Cheviot produced
49-62% P carcasses.
Keywords ram breeds; Romney; crossbred lambs; carcass cuts;
export grades/classes
New Zealand Journal of Agricultural Research, 1996, Vol. 39: 333-340
0028-8233/96/3903-0333 $2.50/0 (c) The Royal Society of New Zealand
1996
PDF file of entire paper: medium quality (572K); (scanned from paper original: notes about this process)
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