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Studies in sow reproduction 5. The effect of lactation length of the sow on the subsequent embryonic development

Published online by Cambridge University Press:  02 September 2010

M. A. Varley  and
D. J. A. Cole
M. A. Varley
Affiliation:
Department of Agriculture and Horticulture, University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leicestershire LE12 5RD
D. J. A. Cole
Affiliation:
Department of Agriculture and Horticulture, University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leicestershire LE12 5RD
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Summary

Forty-five female pigs (sows) were allocated at random to one of three lactation lengths: 7 days, 21 days, 42 days. All sows were remated at the first post-weaning oestrus and were slaughtered at 20 days post coitum. The reproductive tracts were removed, dissected and examined. Ovulation rates as determined by luteal count were similar for all three groups, but the number of viable embryos decreased significantly (P < 0·05) from 13·0 for the 42-day lactation group to 9·2 for the 7-day lactation group. This difference was reflected in a significant (P < 0·01) reduction in the percentage embryo survival rate as lactation length was reduced. Uterine lengths for the 7-day lactation group were significantly (P < 0·05) shorter than the other two groups. Six sows in each treatment group were blood sampled: at weaning, at remating, at 2 days post-mating, at 10 days post-mating and at 20 days post-mating. The plasma samples obtained were assayed for progesterone. No differences were observed between treatment groups for plasma progesterone concentration at any of the sampling times. It is concluded that the reduction of the litter size at the next farrowing following a short lactation length is largely a result of increased embryo death in the first 20 days of gestation.

Type
Research Article
Information
Animal Production , Volume 22 , Issue 1 , February 1976 , pp. 79 - 85
Copyright
Copyright © British Society of Animal Science 1976

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References

Aumaitre, A. and Rettagliati, J. 1972. [Age at weaning in the pig: effects on the repro ductive performance of the sow and on the piglets.] Annls Zootech. 21: 634–636 (Abstr.).CrossRefGoogle Scholar
Baker, L. N., Woehling, H. L., Casida, L. E. and Grummer, R. H. 1953. Occurrence of estrus in sows following parturition. J. Anim. Sci. 12: 33–38.CrossRefGoogle Scholar
Te Brake, J. H. A. 1972. Pig rearing in cages—the extra early weaning of piglets and the fertility of sows. 23rd Mtng EAAP Comm. Pig Production, Verona, Italy, 1972.Google Scholar
Cole, D. J. A., Varley, M. A. and Hughes, P. E. 1975. Studies in sow reproduction. 2. The effect of lactation length on the subsequent reproductive performance of the sow. Anim. Prod. 20: 401–406.CrossRefGoogle Scholar
Haresign, W., Foster, J. P., Haynes, N. B., Crighton, D. B. and Lamming, G. E. 1975. Progesterone levels following treatment of seasonally anoestrus ewes with synthetic LH-releasing hormone. J. Reprod. Fert. 43: 269–279.CrossRefGoogle ScholarPubMed
Knight, J. W., Bazer, F. W. and Wallace, H. D. 1974. Effect of progesterone induced increase in uterine secretory activity on development of the porcine conceptus. /. Anim. Sci. 39: 743–746.CrossRefGoogle ScholarPubMed
McFeely, R. A. 1967. Chromosome abnormalities in early embryos of the pig. J. Reprod. Fert. 13: 579–581.CrossRefGoogle ScholarPubMed
Moody, N. W. and Speer, V. C. 1971. Factors affecting sow farrowing interval. J. Anim. Sci. 32: 510–514.CrossRefGoogle ScholarPubMed
Polge, C. 1972. Reproductive physiology in the pig with special reference to early weaning. Proc. Br. Soc. Anim. Prod. (New Series) 1: 5–18.Google Scholar
Reddy, V. B., Mayer, D. T. and Lasley, J. F. 1958. Hormonal modification of the intra uterine environment in swine and its effect on embryonic viability. Res. Bull. Mo. agric. Exp. Stn, No. 667.Google Scholar
Self, H. L. and Grummer, R. H. 1958. The rate and economy of pig gains and the reproductive behaviour in sows when litters are weaned at 10 days, 21 days or 56 days of age. J. Anim. Sci. 17: 862–868.CrossRefGoogle Scholar
Smidt, D., Scheven, B. and Steinbach, J. 1965. [The influence of lactation on sexual functions in sows.] Ziichtungskunde 37: 23–36.Google Scholar
Svajgr, A. J., Hays, V. W., Cromwell, G. L. and Dutt, R. H. 1974. Effect of lactation duration on reproductive performance of sows. J. Anim. Sci. 38: 100–105.CrossRefGoogle ScholarPubMed
Van der Heyde, H. 1972. A practical assessment of early weaning. Proc. Br. Soc. Anim. Prod. (New Series) 1: 33–36.Google Scholar
Varley, M. A. and Cole, D. J. A. 1976. Studies in sow reproduction. 4. The effects of level of feeding in lactation and level of feeding from weaning to remating on the subsequent reproductive performance of the early-weaned sow. Anim. Prod. 22: 71–77.Google ScholarPubMed
Wrathall, A. E. 1971. Prenatal survival in pigs. Part 1. Ovulation rate and its influence on prenatal survival and litter size in pigs. Rev. Ser. Commonw. Bur. Anim. Hlth, No. 9.Google Scholar