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Effects of using rations of reduced energy concentration for intensively reared beef cattle from 250 kg live weight to slaughter
Published online by Cambridge University Press: 02 September 2010
Summary
1. Two experiments are described in which castrated Ayrshire cattle were reared on a conventional all-concentrate diet to 250 kg live weight. In Experiment 1 the effect of feeding a 1: 1 mixture (by weight) of barley and wet distiller's grains (WDG) from 250 to 408 kg live weight was examined. In Experiment 2 swedes and grass silage were offered in addition to WDG and barley during the growth phase from 250 kg live weight to slaughter. In both experiments a control group was fed an all-concentrate diet.
2. The introduction of WDG to the diet (Experiment 1) caused a significantly lower daily live-weight gain (P < 0·01) and an increase i n time to slaughter (P < 0·01). Carcasses from the control and treated animals were similar in weight, conformation and composition. There were no differences in growth rates in Experiment 2. The treated animals were heavier (P < 0·01) and older at slaughter (P < 0·001) than those in the control group and they produced heavier carcasses (P < 0·05). The carcasses were similar in composition but some differences in conformation occurred. These effects were the consequence of selecting animals for slaughter on the basis of equal finish (i.e. the ratio of muscle plus fat to bone assessed subjectively).
3. The effect of reducing the dietary energy concentration appears t o be smaller with cattle over 250 kg live weight than with younger, lighter cattle. The results, which are discussed in economic terms, suggest that castrated Ayrshire cattle reared on all-concentrate diets should be changed to a diet of lower energy concentration using cheaper feed sources at 250 kg live weight.
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- Copyright © British Society of Animal Science 1976
References
REFERENCES
Broadbent, P. J. 1967. The Growth and Carcass Characteristics of Pure Ayrshire Steers. Ayrshire Cattle Society of Great Britain and Ireland, Ayr.Google Scholar
Broadbent, P. J. 1968a. Growth and carcass development of pure Ayrshire steers. Anim. Prod. 10: 248. (Abstr.).Google Scholar
Broadbent, P. J. 1968b. Carcass evaluation techniques at the North of Scotland College of Agriculture. Proc. Sytnp. Meat Research Institute, Bristol, 1968.Google Scholar
Broadbent, P. J., Ball, C. and Dodsworth, T. L. 1969. The effect of plane of nutrition during calfhood on the subsequent performance of Hereford × Ayrshire steers. Anim. Prod. 11: 155–160.Google Scholar
Broadbent, P. J., Ball, C. and Dodsworth, T. L. 1971. The effects of variations in the energy concentration and protein source of complete diets for beef cattle. Anim. Prod. 13: 605–611.Google Scholar
Broadbent, P. J., Dodsworth, T. L., Ball, C. and Sampford, M. R. 1967. A comparison of semi-intensively reared Charolais × Ayrshire and Shorthorn × Ayrshire cattle. Anim. Prod. 9: 61–66.Google Scholar
Forbes, T. J., Irwin, J. H. D. and Raven, A. M. 1969. The use of coarsely chopped barley straw in high concentrate diets for beef cattle. J. agric. Sci., Camb. 73: 347–354.Google Scholar
Forbes, T. J., Raven, A. M. and Irwin, J. H. D. 1969. The use of coarsely milled barley straw in finishing diets for young beef cattle. J. agric. Sci., Camb. 73: 365–372.CrossRefGoogle Scholar
Kay, M. 1972. Processed roughage in diets containing cereals for ruminants. In Cereal Processing and Digestion, pp. 39–52. US Feed Grains Council, London.Google Scholar
Kay, M. and MacDearmid, A. 1973. A note on the effects of changing the concentration of protein in the diet offered to fattening beef cattle. Anim. Prod. 16: 205–207.Google Scholar
Kay, M., MacDearmid, A. and MacLeod, N. A. 1970. Intensive beef production. 10. Replacement of cereals with chopped straw. Anim. Prod. 12: 261–266.Google Scholar
Kay, M., MacDearmid, A. and MacLeod, N. A. 1974. The nutrition of intensively managed beef cattle. Rep. Rowett Inst. 30: 132–140.Google Scholar
Kay, M., MacDearmid, A. and Massie, R. 1970. Intensive beef production. 11. Replacement of cereals with ground straw. Anim. Prod. 12: 419–424.Google Scholar
Lamming, G. E., Swan, H. and Clarke, R. T. 1966. Studies on the nutrition of ruminants. 1. Substitution of maize by milled barley straw in a beef fattening diet and its effect on performance and carcass quality. Anim. Prod. 8: 303–311.Google Scholar
Meat and Livestock Commission. 1974. Beef Production: Dairy-Bred Calves using Cereals and Arable Products. Handbook No. 2. Meat and Livestock Commission, Bletchley, Bucks.Google Scholar
Pickard, D. W., Swan, H. and Lamming, G. E. 1969. Studies on the nutrition of ruminants. 4. The use of ground straw of different particle sizes for cattle from twelve weeks of age. Anim. Prod. 11: 543–550.Google Scholar
Preston, T. R., Aitken, J. N., Whitelaw, F. G., MacDearmid, A., Philip, E. B. and MacLeod, N. A. 1963. Intensive beef production. 3. Performance of Friesian steers given low-fibre diets. Anim. Prod. 5: 245–249.Google Scholar
Raven, A. M., Forbes, T. J. and Irwin, J. H. D. 1969. The utilization by beef cattle of concentrate diets containing different levels of milled barley straw and of protein. J. agric. Sci., Camb. 73: 355–363.Google Scholar
Swan, H. and Lamming, G. E. 1967. Studies on the nutrition of ruminants. II. The effect of level of crude fibre in maize-based rations on the carcass composition of Friesian steers. Anim. Prod. 9: 203–208.Google Scholar