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Effects of castrating lambs on growth and body composition

Published online by Cambridge University Press:  02 September 2010

G. E. Bradford  and
G. M. Spurlock
G. E. Bradford
Affiliation:
University of California, Davis, California, U.S.A.
G. M. Spurlock
Affiliation:
University of California, Davis, California, U.S.A.
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Extract

Effects of castration on growth, wool production, carcass characteristics, and meat quality in sheep were investigated.

The experiment included two flocks (similar in their effect on pre-weaning performance, but representing high and low planes of nutrition after weaning), two years, and two slaughter ages. Rams weighed approximately 5 % more thanwethers at weaning, and 15 % and 23 % more as yearlings on the low- and high planes of nutrition respectively. Differences in favour of rams in terms of skeletal and muscle size and wool production were also greater on the higher plane of nutrition. Carcass weight was approximately 4%, 8% and 19% higher for rams among lambs, low plane and high plane yearlings, respectively. Proportion of carcass weight in the forequarters was 0·5 %, 1·1 % and 2·3 % higher for rams in these three groups. Rams had less kidney fat and the same percentage of the carcass weight in loin and trimmed leg as wethers in all groups.

Carcass grade and eating quality as evaluated by a taste panel did not differ between ram and wether lambs. Among the lighter yearling group, meat from the loin of ram carcasses was less tender. Quality was appreciably lower for rams in the heavier yearling group. Meat from ram carcasses had 1 to 2% higher cooking loss than that from wethers.

Type
Research Article
Information
Animal Production , Volume 6 , Issue 3 , October 1964 , pp. 291 - 299
Copyright
Copyright © British Society of Animal Science 1964

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References

REFERENCES

Bradford, G. E., Weir, W. C. & Torell, D. T., 1961. The effect of environment from weaning to first breeding on lifetime production of ewes. J. Anim. Sci., 20: 281.Google Scholar
Hammond, J., 1932. Growth and the Development of Mutton Qualities in the Sheep. Oliver and Boyd, Edinburgh.Google Scholar
Hunt, W. E., Meade, D. & Carmichael, B. E., 1938. Effect of castration of lambs on their development and quality of meat. Bull. Md. agric. Exp. Sta., no. 417: 259.Google Scholar
Meyer, J. H., 1962. Removing sources of error in lamb feeding experiments. J. Anim. Sci., 21: 127.Google Scholar
Turton, J. D., 1962. The effect of castration on meat production and quality in cattle, sheep and pigs. Anim. Breed. Abstr., 30: 447.Google Scholar
Walker, D. E., 1951. The influence of sex upon carcass quality of New Zealand fat lamb. N. Z. J. Sci. Tech., A, 32: 30.Google Scholar