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Effect on production records of sex of lamb, twinning, and dam's age in a grassland flock

Published online by Cambridge University Press:  01 October 1962

H. P. Donald
H. P. Donald
Affiliation:
A.R.C. Animal Breeding Research Organisation, Edinburgh, 9
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Extract

The effects of sex, twinning and age of ewe on birth weight, weaning weight and fertility have been studied in 5 years' records of a small grassland flock of Wiltshire × Blackface crossbred ewes with the object of providing provisional correction factors for these variables in recorded flocks under similar management. All these variables produced large effects in the flock studied. On birth weight these were; sex, 0·6 lb.; twinning, 2·1 lb.; hogg's lamb, 2·3 lb. The corresponding adjustments for weaning weight were 7 lb., 14 lb., and 11 lb. Ewes first bred as hoggs subsequently performed well.

Type
Research Article
Information
Animal Production , Volume 4 , Issue 3 , October 1962 , pp. 369 - 377
Copyright
Copyright © British Society of Animal Science 1962

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References

REFERENCES

Blackwell, R. L., & Henderson, C. R., 1955. Variation infleeceweight, weaning weight and birth weight of sheep under farm conditions. J. Anim. Sci., 14: 831.Google Scholar
Boaz, T. G., 1960. Research in agriculture on the Leeds University Farm. J. Yorks. agric. Soc, 111: 25.Google Scholar
Bogart, R., De Baca, R. C., Calvin, L. D., & Nelson, O. M., 1957. Factors affecting birth weights of crossbred lambs. J. Anim. Sci., 16: 130.Google Scholar
Bonsma, F. N., 1939. Factors influencing the growth and development of lambs, with special reference to cross-breeding of Merino sheep for fat-lamb production in South Africa. Publ. Univ. Pretoria, Series 1, No. 48.Google Scholar
Donald, H. P., 1958. Crossbred lamb production from cast-for-age Blackface ewes. Proc. Brit. Soc. Anim. Prod., 1958: 77.CrossRefGoogle Scholar
Donald, H. P., & Mclean, J. W., 1935. The growth rate of lambs in Canterbury. N.Z.J. Sci. Tech., 17: 497.Google Scholar
Jamison, H. M., Carter, R. C., Gaines, J. A., & Kincaid, C. M., 1961. The effect of breed of sire on body size of lambs at birth. J. Anim. Sci., 20: 154.CrossRefGoogle Scholar
Johansson, I., & Hansson, A., 1943. The sex ratio and multiple births in sheep. Lant-brukshögskolans Ann., 11: 145.Google Scholar
McLean, J. W., 1952. Progeny testing in sheep. Lincoln College (N.Z.) Techn. Publ. No. 8.Google Scholar
Peters, H. F., Slen, S. B., & Hargrave, H. J., 1961. Genetic trends in performance of the Romnelet sheep during the period of breed development. Canad. J. Anim. Sci., 41: 126.CrossRefGoogle Scholar
Purser, A. F., & Roberts, R. C., 1959. The relationship of hogg weight to the subsequent performance of Scottish Blackface ewes. Anim. Prod., 1: 107.Google Scholar
Purser, A. F., & Young, G. B., 1959. Lamb survival in two hill flocks. Anim. Prod., 1: 85.Google Scholar
Roberts, R. C., 1958. The use of pedigree and mountain-type rams in a Welsh Mountain flock. Year Book of the National Sheep Breeders' Association, p. 36.Google Scholar
Slee, J., 1959. Fleece shedding, staple length andfleeceweight in experimental Wiltshire Horn-Scottish Blackface sheep crosses. J. agric. Sci., 53: 209.Google Scholar
Slee, J., & Carter, H. B., 1962. Fibre shedding and fibre follicle relationships in the fleeces of experimental Wiltshire Horn X Scottish Blackface sheep crosses. J. agric. Sci. 58: 309.Google Scholar
Starke, J. S., Smith, J. B., & Joubert, D. M., 1958. The birth weight of lambs. Sci. Bull. Dep. Agric. S. Afr., No. 382, 28 pp.Google Scholar