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The effect of level of pre-mating nutrition on ovulation rate in Scottish Blackface ewes in different body conditions at mating

Published online by Cambridge University Press:  02 September 2010

R. G. Gunn ,
J. M. Doney  and
W. F. Smith
R. G. Gunn
Affiliation:
Hill Farming Research Organisation, Bush Estate, Penicuik, Midlothian EH26 0PY
J. M. Doney
Affiliation:
Hill Farming Research Organisation, Bush Estate, Penicuik, Midlothian EH26 0PY
W. F. Smith
Affiliation:
Hill Farming Research Organisation, Bush Estate, Penicuik, Midlothian EH26 0PY
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Abstract

In two experiments over 2 years, 181 Scottish Blackface ewes were differentially group-fed indoors to achieve moderately-good (score 2·5), moderate (score 2) or poor (score 1·5) body condition. Over 5 weeks prior to mating, ewes in moderately-good condition were either maintained or brought down to moderate condition by restricted feeding and ewes in moderate and poor condition were raised, respectively, to moderately-good and moderate condition by a high level of feeding. After mating, ewes were maintained in condition until slaughtered for a count of corpora lutea relating to first service. Ovulation rate was positively and significantly related to the level of pre-mating food intake at the moderate level of condition but not significantly so at the moderately-good level. It is postulated that ewes of this breed are more sensitive to the level of pre-mating food intake when in moderate condition at mating than they are when condition has risen to a moderately-good level.

Type
Research Article
Information
Animal Production , Volume 39 , Issue 2 , October 1984 , pp. 235 - 239
Copyright
Copyright © British Society of Animal Science 1984

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References

REFERENCES

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. and Doney, J. M. 1979. Fertility in Cheviot ewes. 1. The effect of body condition at mating on ovulation rate and early embryo mortality in North and South Country Cheviot ewes. Anim. Prod. 29: 11–16.Google 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.CrossRefGoogle Scholar
Gunn, R. G., Doney, J. M. and Russel, A. J. F. 1972. Embryo mortality in Scottish Blackface ewes as influenced by body condition at mating and by post-mating nutrition. J. agric. Sci., Camb. 79: 19–25.CrossRefGoogle Scholar
Gunn, R. G., Doney, J. M. and Smith, W. F. 1979a. Fertility in Cheviot ewes. 2. The effect of level of pre-mating nutrition on ovulation rate and early embryo mortality in North and South Country Cheviot ewes in moderately-good condition at mating. Anim. Prod. 29: 17–23.Google Scholar
Gunn, R. G., Doney, J. M. and Smith, W. F. 1979b. Fertility in Cheviot ewes. 3. The effect of level of nutrition before and after mating on ovulation rate and early embryo mortality in South Country Cheviot ewes in moderate condition at mating. Anim. Prod. 29: 25–31.Google Scholar
Gunn, R. G., Doney, J. M. and Smith, W. F. 1984. The effect of different durations and times of high- level feeding prior to mating on the reproductive performance of Scottish Blackface ewes. Anim. Prod. 39: 99–105.Google Scholar
Gunn, R. G., Smith, W. F., Senior, A. J., Barthram, E. and Sim, D. A. 1983. Pre-mating pasture intake and reproductive responses in North Country Cheviot ewes in different body conditions. Anim. Prod. 36: 509 (Abstr.).Google Scholar
Russel, A. J. F., Doney, J. M. and Gunn, R. G. 1969. Subjective assessment of body fat in live sheep. J. agric. Sci., Camb. 72: 451–454.CrossRefGoogle Scholar