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The nutrition of artificially reared lambs. 3. The effect of sex on the performance and carcass composition of lambs subjected to different nutritional treatments

Published online by Cambridge University Press:  02 September 2010

J. A. Morgan  and
J. B. Owen
J. A. Morgan
Affiliation:
Department of Applied Biology, University of Cambridge
J. B. Owen
Affiliation:
Department of Applied Biology, University of Cambridge
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Summary

Forty-eight Suffolk cross lambs were reared artificially from 2 days of age. Sixteen entire males, 16 castrates (castrated by rubber ring at 2 days) and 16 female lambs were allocated at random to a set of 2×2×2 factorial treatments in which feeding was ad libitum or restricted for each of three growth periods—from 2 days old to 15 kg, from 15 to 25 kg and from 25 to 40 kg live weight.

The results showed no apparent interaction of sex and feeding treatment and differences due to sex were apparent only in the period after 25 kg live weight. Entire males grew faster and were more efficient at this stage although there was little difference in voluntary feed intake. Carcasses of the males were lower in fat and energy content and higher in protein content than those of females and castrates.

The feeding treatments in the main had similar effects to those shown in other studies in the series. Restricted milk feeding was compensated for by increased solid food consumption during the milk-feeding stage but in this experiment there was no tendency for restricted lambs to eat more and grow faster when fed ad libitum in the following period. Restricted feeding in the last period, particularly if preceded by restricted feeding, gave higher killing-out percentage, higher fat content and lower protein content in the carcass than feeding ad libitum. This finding was partly explained by the higher weight of the carcasses of the restricted lambs.

Type
Research Article
Information
Animal Production , Volume 16 , Issue 1 , February 1973 , pp. 49 - 57
Copyright
Copyright © British Society of Animal Science 1973

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References

REFERENCES

Allen, D. M. 1969. The performance of lambs fed all concentrate diets varying in energy density and crude protein content. In Meat Production from Entire Animals (ed. Rhodes, D. N.), p. 103. J. and A. Churchill, London.Google Scholar
Andrews, R. P. and Ørskov, E. R. 1970. The nutrition of the early weaned lamb. 2. The effect of dietary protein concentration, feeding level and sex on body composition at two liveweights. J. agric. Sci., Camb. 75: 19–26.CrossRefGoogle Scholar
Bradfield, P. G. E. 1967. Sex differences in the growth of sheep. In Growth and Development in Mammals (ed. Lodge, G. A. and Lamming, G. E.), p. 92. Butterworth, London.Google Scholar
Bradford, G. E. and Spurlock, G. M. 1964. Effect of castrating lambs on growth and body composition. Anim. Prod. 6: 291–299.Google Scholar
Brännäng, E. 1966. Studies on monozygous cattle twins. 18. The effect of castration and age of castration on the growth rate, feed conversion and carcass traits of Swedish Red and White cattle. Anim. Breed. Abstr. 37: 575–576.Google Scholar
Everitt, G. C. and Jury, K. E. 1966. Effects of sex and gonadectomy on the growth and development of Southdown × Romney Cross lambs. 1. Effects on liveweight growth and components of liveweight. J. agric. Sci., Camb. 66: 1–14.CrossRefGoogle Scholar
Geay, Y. and Malterre, C. 1971. The growth and quality of the carcasses of cattle slaughtered at 24 months as influenced by castration and the nature of the glucides in the diet. Ann. Zootech. 20: 251–257.CrossRefGoogle Scholar
Graham, N. McC. 1970. Growth in sheep. E.A.A.P. Publication No. 13 (Vitznau). p. 105.Google Scholar
Graham, N. McC. and Searle, T. W. 1972. Balance of energy and matter in growing sheep at several ages, body weights, and planes of nutrition. Aust. J. agric. Res. 23: 97–108.CrossRefGoogle Scholar
Meyer, J. H., Weir, W. C. and Torell, D. T. 1962. Response of immature sheep to partial starvation. J. Anim. Sci. 21: 916–923.CrossRefGoogle Scholar
Morgan, J. A. and Owen, J. B. 1972. The nutrition of artificially reared lambs. The effect of different feeding methods applied at three stages of growth. Anim. Prod. 15: 285–292.Google Scholar
Nicholson, J. W. G. and Sutton, J. D. 1969. The effect of diet composition and level of feeding on digestion in the stomach and intestines of sheep. Br. J. Nutr. 23: 585–601.CrossRefGoogle ScholarPubMed
Ørskov, E. R., Fraser, C. and Kay, R. N. B. 1969. Dietary factors influencing the digestion of starch in the rumen and small and large intestine of early weaned lambs. Br. J. Nutr. 23: 217–226.CrossRefGoogle ScholarPubMed
Prescott, J. H. D. and Lamming, G. E. 1964. The effect of castration on meat production in cattle, sheep and pigs. J. agric. Sci., Camb. 63: 341–357.CrossRefGoogle Scholar
Trail, J. C. M. and Sacker, G. D. 1969. Growth of cross-bred Dorset Horn lambs from East African blackheaded sheep. J. agric. Sci., Camb. 73: 239–243.CrossRefGoogle Scholar