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The effect of body condition and time of mating on the reproductive performance of Masham ewes

Published online by Cambridge University Press:  02 September 2010

J. E. Newton ,
J. E. Betts  and
Renée Wilde
J. E. Newton
Affiliation:
Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
J. E. Betts
Affiliation:
Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
Renée Wilde
Affiliation:
Grassland Research Institute, Hurley, Maidenhead, Berkshire SL6 5LR
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Abstract

Masham ewes were mated at three stages of the breeding season, early (15 September to 20 October), mid (20 October to 24 November) and late (15 December to 19 January), at two different body condition scores, 4 and 2, for 3 successive years. The mean scores achieved for body condition 4 were 3·6, 3·7 and 3·9 for early, mid and late respectively and for body condition 2 were 2·4, 2·3 and 2·2. In the late lambing flock more ewes were marked by vasectomized rams and less ewes were barren than in the early and mid flocks. The ewes in higher body condition at mating had significantly more triplets and fewer singles, and a higher lambing percentage (183 versus 165). This effect of body condition on litter size distribution was significant at each time of mating, with the ewes at the late mating producing significantly fewer triplets and more singles; this difference was caused by a reduction in the performance of the body condition 4 ewes in the late group.

Young ewes in the body condition 4 group produced significantly fewer triplets and more singles than the mature ewes in the same body condition group, but at the lower body condition age had no effect on litter size distribution.

Type
Research Article
Information
Animal Production , Volume 30 , Issue 2 , April 1980 , pp. 253 - 260
Copyright
Copyright © British Society of Animal Science 1980

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References

REFERENCES

Allden, W. G. 1956. Time of mating as a factor influencing prolificacy in cross-bred ewes, and its effect upon lambs and wool production in the fat lamb flock. Proc. Aust. Soc. Anim. Prod. 1: 88–89.Google Scholar
Averill, R. L. W. 1959. Ovulatory activity in mature Romney ewes in Otago. N.Z. Jl agric. Res. 2: 575–583.CrossRefGoogle Scholar
Bramley, P. S., Denehy, H. L. and Newton, J. E. 1976. The effect of different planes of nutrition before mating on the reproductive performance of Masham ewes. Vet. Rec. 99: 294–296.Google Scholar
Coop, I. E. 1966. Effect of flushing on reproductive performance of ewes. J. agric. Sci., Camb. 67: 305–323.Google Scholar
Ducker, M. J. and Boyd, J. S. 1977. The effect of body size and body condition on the ovulation rate of ewes. Anim. Prod. 24: 377–385.Google Scholar
Fletcher, I. and Geytenbeek, P. E. 1970. Seasonal variation in the ovarian activity of Merino ewes. Aust. J. exp. Agric. Anim. Husb. 10: 267–270.CrossRefGoogle Scholar
Geisler, Pamela A. and Fenlon, J. S. 1978. The effects of body weight and its components on lambing performance in some commercial flocks in Britain. Anim. Prod. 28: 245–255.Google Scholar
Gunn, R. G. and Doney, J. M. 1975. The interaction of nutrition and body condition at mating on ovulation rate and early embryo mortality in Scottish Blackface ewes. J. agric. Sci., Camb. 85: 465–470.CrossRefGoogle Scholar
Gunn, R. G., Doney, J. M. and Russel, A. J. F. 1969. Fertility in Scottish Blackface ewes as influenced by nutrition and body condition at mating. J. agric. Sci., Camb. 73: 289–294.Google Scholar
Hendy, C. R. C. and Bowman, J. C. 1974. The association between variation in the seasonal onset of oestrus and litter size in the ewe. J. Reprod. Fert. 40: 105–112.Google Scholar
Hulet, C. V. and Foote, W. C. 1967. Relationship between ovulation rate and reproductive performance in sheep. J. Anim. Sci. 26: 563–566.CrossRefGoogle ScholarPubMed
Hulet, C. V., Price, D. A. and Foote, W. C. 1974. Effects of month of breeding and feed level on ovulation and lambing rates of Panama ewes. J. Anim. Sci. 39: 73–78.Google Scholar
Jefferies, B. C. 1961. Body condition scoring and its use in management. Tasm. J. Agric. 32: 19–21.Google Scholar
Land, R. B., Dickinson, A. G. and Read, J. L. 1969. The influence of seasonal variation on fertility and early body growth in sheep. Anim. Prod. 11: 251–257.Google Scholar
Lees, J. L. 1966. Variations in the time of onset of the breeding season in Clun ewes. J. agric. Sci., Camb. 67: 173–179.CrossRefGoogle Scholar
Wheeler, A. G. and Land, R. B. 1977. Seasonal variation in oestrus and ovarian activity of Finnish Landrace, Tasmanian Merino and Scottish Blackface ewes. Anim. Prod. 24: 363–376.Google Scholar