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Growth and carcass characteristics of weaned single-suckled calves slaughtered on achieving slaughter condition or 8 or 16 weeks later

Published online by Cambridge University Press:  02 September 2010

P. J. Broadbent
P. J. Broadbent
Affiliation:
North of Scotland College of Agriculture, 581 King Street, Aberdeen AB9 1UD
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Summary

1. Weaned single-suckled calves (castrates) were housed at 260·7 kg live weight. Six genotypes, all two- or three-way crossbreds, were represented. A diet of bruised barley, wet distiller's grains, swedes and grass silage was offered until the required minimum live weight (363 kg) and body composition was reached. The cattle were then slaughtered (treatment A), or retained for 8 (treatment B) or 16 weeks (treatment C). During the period when treatment B and C animals were retained their diet was 53% bruised barley and 47% wet distiller's grains offered ad libitum.

2. Live weights at slaughter were 418·2, 458·6 and 496·1 kg (P < 0·001), carcass weights 240·5, 266·2 and 295·7 kg (P < 0·001), and killing-out percentages 57·5, 58·1 and 59·6 (P<0·01) for treatments A, B and C respectively. Daily live-weight gain did not decline during the 8 or 16 weeks cattle were retained on treatments B and C.

3. Retaining the cattle to slaughter points B and C caused increases in the percentage of low-value joints in the carcass, carcass fat percentage, dry matter and fat contents of the dissected m. longissimus dorsi; and decreases in the percentage of high-value joints, carcass lean and bone percentage, crude protein and ash contents of m. longissimus dorsi. The carcass composition was 55·6, 53·5 and 51·4% lean (P<0·001); 30·7, 33·3 and 36·2% fat (P<0·001); 13·7, 13·2 and 12·4% bone (P< 0·001) for treatments A, B and C respectively.

4. The results are discussed in relation to the choice made by beef producers between slaughter and retention of cattle which have reached suitable live weight and condition for marketing.

Type
Research Article
Information
Animal Production , Volume 23 , Issue 2 , October 1976 , pp. 155 - 163
Copyright
Copyright © British Society of Animal Science 1976

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References

REFERENCES

Anon. 1966. Major Beef Research Project. A comparison of the growth of different types of cattle for beef production. Underhill (Plymouth) Ltd.Google Scholar
Association of official agricultural chemists. 1965. Official Methods of Analysis. 10th ed. Association of Official Agricultural Chemists, Washington, DC.Google Scholar
Baker, R. D., Ball, C., Kilkenny, J. B., and Walsh, A. 1972. Beef Production: Suckled Calves. Handbook No. 3. Meat and Livestock Commission, Bletchley, Bucks.Google Scholar
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. 1968. Carcass evaluation techniques at the North of Scotland College of Agriculture. Proc. Symp. Meat Research Institute, Bristol, 1968.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
Davidson, J., Mathieson, J. and Boyne, A. W. 1970. The use of automation in determining nitrogen by the Kjeldahl method, with final calculations by computer. Analyst, Lond. 95: 181–193.CrossRefGoogle ScholarPubMed
Dinkel, C. A., Busch, D. A., Schafer, D. E., Tuma, H. J., Minyard, J. A. and Costello, W. J. 1969. Changes in composition of beef carcasses with increasing animal weight. J. Anim. Sci. 28: 316–323.CrossRefGoogle ScholarPubMed
Dodsworth, T. L. and Ball, C. 1962. Studies on the feeding of supplements to beef cattle on grass. Anim. Prod. 4: 221–226.Google Scholar
Fahmy, M. H. and Lalande, G. 1975. Growth rate, feed conversion ratio and carcass traits of Charolais × Holstein-Friesian and Hereford × Holstein-Friesian steers slaughtered at three different weights. Anim. Prod. 20: 11–18.Google Scholar
Guenther, J. J., Bushman, D. H., Pope, L. S. and Morrison, R. D. 1965. Growth and development of the major carcass tissues in beef calves from weaning to slaughter weight, with special reference to the effect of plane of nutrition. J. Anim. Sci. 24: 1184–1191.CrossRefGoogle Scholar
Hiner, R. L. and Bond, J. 1971. Growth of muscle and fat in beef steers from 6 to 36 months of age. J. Anim. Sci. 32: 225–232.CrossRefGoogle Scholar
Levy, D., Holzer, Z. and Folman, Y. 1975. Effect of concentrate: roughage ratio on the production of beef from Israeli-Friesian bulls slaughtered at different live weights. Anim. Prod. 20: 199–205.Google Scholar
Waldman, R. C., Tyler, W. J. and Brungardt, V. H. 1971. Changes in the carcass composition of Holstein steers associated with ration energy levels and growth. J. Anim. Sci. 32: 611–619.CrossRefGoogle ScholarPubMed
Zinn, D. W., Durham, R. M. and Hedrick, H. B. 1970. Feedlot and carcass grade characteristics of steers and heifers as influenced by days on feed. J. Anim. Sci. 31: 302–306.CrossRefGoogle Scholar