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The effect of change and level of nutrition on the reproductive performance of group-fed dairy heifers

Published online by Cambridge University Press:  02 September 2010

M. J. Ducker ,
N. Yarrow  and
S. V. Morant
M. J. Ducker
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
N. Yarrow
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
S. V. Morant
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
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Abstract

One hundred and sixty Friesian heifers were allocated to two groups 8 or 9 weeks before artificial insemination and group-fed to gain live weight at 0·8 or 0·3 kg/day. Half the heifers of each group were moved to the other group 2 weeks before first insemination. All heifers received two intramuscular injections of prostaglandin (cloprostenol) 11 days apart, followed by inseminations at 72 and 96 h after the second injection.

The feeding regimes applied did not significantly affect the fertility of groups of heifers as measured by pregnancy rates to fixed-time or all inseminations. There were significant differences between pregnant and nonpregnant heifers within groups where changes in feeding levels were imposed (P<0·1 to P<0·01). Heifers whose growth rate was most severely checked, or whose body condition deteriorated relative to others in the group, were less fertile. For heifers changed from the low to the high plane of nutrition, those experiencing the greater increase in growth rate and body condition were more fertile than others.

No relationship was found between live-weight change, plasma glucose concentrations and fertility. In a second trial 158 Friesian heifers received two injections of cloprostenol 11 days apart, followed by inseminations at 72 and 96 h after the second injection. After the fixed-time inseminations the heifers were divided into two groups and were group-fed to gain live weight at 0·8 and 04 kg per head per day. Although the mean live-weight gain of the high group was significantly higher than that of the lower group (P<0·001), the overall pregnancy rates were not significantly different.

Type
Research Article
Information
Animal Production , Volume 34 , Issue 2 , April 1982 , pp. 203 - 211
Copyright
Copyright © British Society of Animal Science 1982

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References

REFERENCES

Baishya, N., Morant, S. V., Pope, G. S. and Leaver, J. D. 1982. Rearing of dairy cattle. 8. Relationships of dietary energy intake, changes in live weight, body condition and fertility. Anim. Prod. 34: 63–70.Google Scholar
Coop, I. E. 1966. Effect of flushing on reproductive performance of ewes. J. agric. Sci., Camb. 67: 305–323.CrossRefGoogle Scholar
Downie, J. G. and Gelman, A. L. 1976. The relationship between changes in bodyweight, plasma glucose and fertility in beef cows. Vet. Rec. 99: 210–212.Google Scholar
Ducker, M. J. 1980. The effect of feeding strategy on the reproductive performance of dairy cows. Feeding Strategies for Dairy Cows (ed. Broster, W. H., Johnson, C. L. and Tayler, J. C.), pp. 13.1–13.2. Agricultural Research Council, London.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
Kilkenny, J. B. and Herbert, W. A. 1976. Rearing replacements for beef and dairy herds. MMB LCP Services/MLC Beef Improvement Services. Meat and Livestock Commission, Bletchley, Milton Keynes.Google Scholar
Lamond, D. R. 1970. The influence of undernutrition on reproduction in the cow. Anim. Breed. Abstr. 38: 359–372.Google Scholar
Leaver, J. D. 1977. Rearing of dairy cattle. 7. Effect of level of nutrition and body condition on the fertility of heifers. Anim. Prod. 25: 219–224.Google Scholar
Lowman, B. G. 1980. Management of reproduction in beef cattle. In Proc. 2nd Study Conf. Scot. Agric. Colls Fert. Reprod. Cattle, Peebles, 1979, pp. 60–77.Google Scholar
McClure, T. J. 1970. An experimental study of the causes of a nutritional and lactational stress infertility of pasture-fed cows, associated with loss of bodyweight at about the time of mating. Res. vet. Sci. 11: 247–254.CrossRefGoogle ScholarPubMed
Mulvany, P. M. 1977. Dairy cow condition scoring. Natn. Inst. Res. Dairy., Reading.Google Scholar
Rochet, M. 1973. [Fertility of cows and heifers as affected by variations in the feeding level at the moment of insemination.] Annls Zootech. 22: 327–331.CrossRefGoogle Scholar
Roy, J. H. B. 1978. Rearing dairy herd replacements. J. Soc. Dairy Technol. 31: 73–79.CrossRefGoogle Scholar