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The nutrition of the early weaned lamb:III. The effect of ad libitum intake of diets varying in protein concentration on performance and on body composition at different live weights

Published online by Cambridge University Press:  27 March 2009

E. R. Ørskov ,
I. McDonald ,
C. Fraser  and
Elizabeth L. Corse
E. R. Ørskov
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
I. McDonald
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
C. Fraser
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
Elizabeth L. Corse
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
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Summary

1. Fifty lambs weaned at about 5 weeks of age were fed ad libitum on mixtures of barley and fish meal containing either 11·0, 15·7 or 19·4% crude protein in dry matter. Male and female lambs on each diet were killed at intervals, starting after they had been on the diets for 3 weeks. The last to be killed had attained a live weight of about 55 kg.

2. The mean rate of voluntary feed consumption was less at all live weights for the lambs on the diet containing 11·0% crude protein than for those on the other diets and the difference was statistically significant at live weights of 30 and 35 kg. Mean rates of live-weight gain on the low, medium and high protein diets were respectively 191, 270 and 330 g per day for the male lambs and 177, 225 and 301 g per day for the females, the increase with protein concentration being highly significant. Feed conversion rate (kg feed/kg gain) over the whole experiment increased with increasing weight at slaughter. After adjustment for this effect the mean values showed significant dietary effects, and were least on the highest protein concentration.

3. The percentages (y) of nitrogen or of ether extract in the dry matter of the carcass or of the whole empty body were found to be related non-linearly to the empty-body weight (x) at time of slaughter. The relationships were satisfactorily described by equations of the form y = A + Be-Cx, where A, B and C were fitted constants. The relationships for males and females had to be fitted separately, but a common value of A could be used with each of the three groups of male lambs and similarly for the three female groups.

4. These relationships were used to obtain estimates of the nitrogen, ether extract and energy content of empty-body gain per unit live-weight gain. The estimated percentages of energy retained as fat were of the order of 76–83%, in agreement with ARC estimates (1965), except for male lambs between 14 and 20 kg live weight on medium or high-protein diets, for which the estimates were only 62 and 63%.

5. The implications of these relationships are discussed with particular reference to the finding of dietary effects on body composition during the growth period of the lambs and to the tendency for these differences in body composition to diminish as mature live weight was approached. The differences in body composition between male and female lambs showed no such tendency to diminish.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 77 , Issue 3 , December 1971 , pp. 351 - 361
Copyright
Copyright © Cambridge University Press 1971

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References

REFERENCES

Agricultural Research Council (1965). The Nutrient Requirements of Farm Livestock, No. 2 Ruminants. London: A.R.C. Technical Reviews and Summaries.Google Scholar
Andrews, R. P. & Ørskov, E. R. (1970 a). The nutrition of the early weaned lamb. I. The influence of protein concentration and feeding level on rate of gain in body weight. J. agric. Sci., Carnb. 75, 11–18.CrossRefGoogle Scholar
Andrews, R. P. & Ørskov, E. R. (1970 b). The nutrition of the early weaned lamb. II. The effect of dietary protein concentration, feeding level and sex on body composition at two live weights. J. agric. Sci., Camb. 75, 19–26.CrossRefGoogle Scholar
Campling, R. C. (1970). Physical regulation of voluntary intake. In Physiology of Digestion and Metabolism in the Ruminant, p. 226. Ed. Phillipson, A. T.. Newcastle upon Tyne: Oriel Press.Google Scholar
Cloete, J. G. (1964). Studies on metabolic faecal nitrogen excretion in sheep. Ph.D. Thesis. University of Stellenbosch, South Africa.Google Scholar
Egan, A. R. & Moir, R. J. (1965). Nutritional status and intake regulation in sheep. I. Effects of duodenally infused single doses of casein, urea or propionate upon voluntary intake of a low protein roughage by sheep. Aust. J. agric. Res. 16, 437–49.CrossRefGoogle Scholar
Elliot, R. C. & Topps, J. H. (1963). Voluntary intake of low protein diets by sheep. Anitn. Prod. 5, 269–76.Google Scholar
Elsley, F. W. H., McDonald, I. & Fowler, V. R. (1964). The effect of plane of nutrition on the carcasses of pigs and lambs when variations in fat content are excluded. Anim. Prod. 6, 141–54.Google Scholar
Graham, N. Mc. (1970). Growth in sheep, pp. 105–8. EAAP 5th Symposium on Energy Metabolism. Zurich, Switzerland.Google Scholar
Hammond, J. (1932). Growth and the Development of Mutton Qualities in the Sheep. Edinburgh: Oliver and Boyd Ltd.Google Scholar
Huxley, J. (1932). Problems of Relative Growth. London: Methuen.Google Scholar
Jagusch, K. T., Norton, B. W. & Walker, D. M. (1970). Body composition studies with the milk-fed lamb. II. The effect of the age of the lamb and the protein content of the diet on the chemical composition of the body and its organs. J. agric. Sci., Camb. 75, 279–85.CrossRefGoogle Scholar
Kay, M., MacLeod, N. A. & Macdearmid, A. (1969). Protein content of the diet and food intake in steers. Proc. Nutr. Soc. 28, 55 A.Google ScholarPubMed
McMeekan, C. P. (1940 a). Growth and development in the pig, with special reference to carcass quality characters. I. Age changes in growth and development. J. agric. Set., Gamb. 30, 276–343.Google Scholar
McMeekan, C. P. (1940 b). Growth and development in the pig, with special reference to carcass quality characters. II. The influence of the plane of nutrition on growth and development. J. agric. Sci., Camb. 30, 387–436.CrossRefGoogle Scholar
McMeekan, C. P. (1940 c). Growth and development in the pig, with special reference to carcass quality characters. III. Effect of the plane of nutrition on the form and the composition of the bacon pig. J. agric. Sci., Camb. 30, 511–69.CrossRefGoogle Scholar
Norton, B. W., Jagusch, K. T. & Walker, D. M. (1970). Body composition studies with the milk-fed lamb. III. The effect of the protein and energy intake on the composition of the live-weight gain. J. agric. Sci., Camb. 75, 287–92.CrossRefGoogle Scholar
Ørskov, E. R., Fraser, C. & Corse, E. L. (1971). The effect of protein supplementation via the abomasum on the voluntary intake of concentrate by young growing sheep. Proc. Nutr. Soc. 30, 25A–26A.Google ScholarPubMed
Ørskov, E. R., Fraser, C. & McDonald, I. (1971). Digestion of concentrate in sheep. I. The effect of increasing the concentration of soyabean meal in a barley diet on apparent disappearance of feed constituents along the digestive tract. Br. J. Nutr. 25, 225–33.CrossRefGoogle Scholar
Ørskov, E. R. & McDonald, I. (1971). The utilization of dietary energy for maintenance and for fat and protein deposition in young growing sheep. In Energy Metabolism of Farm Animals, pp. 121–4. Ed. Schürch, A. and Wenk, C.. Zurich: Juris Verlag.Google Scholar
Plsson, H. & Vergés, J. B. (1952 a). Effects of plane of nutrition on growth and development of carcass quality in lambs. Part I. The effects of high and low planes of nutrition at different ages. J. agric. Sci., Camb. 42, 1–92.CrossRefGoogle Scholar
Plsson, H. & Vergés, J. B. (1952 b). Effects of plane of nutrition on growth and development of carcass quality in lambs. Part II. Effects on lambs of 30 lb. carcass weight. J. agric. Sci., Camb. 42, 93–149.CrossRefGoogle Scholar
Reid, J. T., Bensadoun, A., Bull, L. S., Burton, J. H., Gleesen, P. A., Han, L. K., Joo, Y. D., Johnson, D. E., McManus, W. R., Paladines, O. L., Stroud, J. W., Tyrrell, H. F., Van Niekirk, B. D. H., Wellington, G. H. & Wood, J. D. (1968). Changes in body composition and meat characteristics accompanying growth of animals. Proc. Cornell Nutr. Conf., pp. 18–27.Google Scholar