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Factors governing the shape of the growth curve of body weight and the age at slaughter of Suffolk × Welsh lambs

Published online by Cambridge University Press:  02 September 2010

J. S. Broadbent  and
J. H. Watson
J. S. Broadbent
Affiliation:
Department of Agriculture, University College of North Wales, Bangor
J. H. Watson
Affiliation:
Department of Agriculture, University College of North Wales, Bangor
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Extract

Curves of growth in live-weight, from birth to 16 weeks of age, of 362 Suffolk × Welsh lambs were analysed for the effect of sex, birth type, sire and test centre environment and related to variation in age at slaughter.

The relative pre-natal disadvantages of twin lambs resulted in their curves of growth differing from those of single-born animals, particularly in males. Test centre environment exerted a marked effect in such cases. At one centre, male twins showed marked compensatory growth.

Differences in growth existed between the 14 sire progeny groups. As the linear component of the growth curves decreased, the quadratic values became increasingly negative. Deceleration of growth was most marked in slowest growing progeny groups and this was accentuated by a poor test centre environment.

These factors combined to influence age at slaughter, which was also related to birth weight of the lamb. Lambs at the best test centre reached slaughter weight 10 and 16 days earlier than lambs at the two remaining centres. Sires produced differences in age at slaughter of 10 to 14 days, within centres.

Type
Research Article
Information
Animal Production , Volume 8 , Issue 3 , October 1966 , pp. 435 - 444
Copyright
Copyright © British Society of Animal Science 1966

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References

REFERENCES

Bogart, Ralph, de Baca, R. C., Calvin, Lyle D., & Nelson, O. M., 1957. Factors affecting birth weights of crossbred lambs. J. Anim. Sci., 16: 130–135.CrossRefGoogle Scholar
Bonsma, F. N., 1939. Factors influencing growth and development of lambs, with special reference to cross-breeding of Merino sheep for fat-lamb production in South Africa. Univ. Pretoria Pubi. Ser. I Agrie. No. 48.Google Scholar
Donald, H. P., 1958. Crossbred lamb production from cast-for-age Blackface ewes. Proc. Brit. Soc. Anim. Prod., pp. 77–93.CrossRefGoogle Scholar
Mason, I. L., & Dassat, P., 1954. Milk, meat and wool production in the Langhe sheep of Italy. Z. Tierzücht. ZüchtBiol., 62: 197–234.CrossRefGoogle Scholar
Phillips, R. W., & Dawson, W. M., 1937. The relation of type and time of birth and birth weight of lambs to their survival, growth and suitability for breeding. Proc. AmerSoc. Anim. Prod., 30: 296–306.Google Scholar
Taylor, St. C. S., & Craig, J., 1965. Genetic correlation during growth of twin cattle. Anim. Prod., 7: 83–102.Google Scholar
Thomson, W., & McDonald, I., 1955. The relation of weaning weight to birth weight of lambs. Proc. Brit. Soc. Anim. Prod., pp. 38–4.CrossRefGoogle Scholar