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Studies in sow reproduction 6. The effect of lactation length on pre-implantation losses

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, Leics, LE12 5RD
D. J. A. Cole
Affiliation:
Department of Agriculture and Horticulture, University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leics, LE12 5RD
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Abstract

Thirty Landrace × (Landrace × Large White) sows were used to investigate the importance of pre-implantation losses in the embryonic mortality of the early-weaned sow. The sows were allocated at random to one of two lactation lengths, namely, 7 or 42 days. Following weaning and remating the sows were slaughtered at 9 days post coitum. Ovulation rates were similar for both groups (15·3 and 15·1 for the 7-day and 42-day weaned groups respectively). Numbers of embryos present at 9 days post coitum were 12·5 for the 42-day group and 11·2 for the 7-day group and the difference was non-significant. Percentage embryo survival was 83·5% for the 42-day group and 74·3% for the 7-day group; the difference was non-significant. It was concluded that the bulk of embryo loss in the early-weaned sow occurred after the pre-implantation stage and was probably at or around implantation.

Type
Research Article
Information
Animal Production , Volume 27 , Issue 2 , October 1978 , pp. 209 - 214
Copyright
Copyright © British Society of Animal Science 1978

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References

REFERENCES

Aumaitre, A., Perez, J. M. and Chauvel, J. 1975. [Productivity of sows in France as affected by housing conditions, equipment of farrowing pens and age at weaning.] Journees Rec. Porcine en France, pp. 10–11.Google Scholar
Cole, D. J. A., Varley, M. A. and Hughes, P. E. 1965. 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
Crombie, Paula R. 1970. Ultrastructure of the foetal-maternal attachment in the pig. J. Physiol., Lond. 210: 101P–102P.Google ScholarPubMed
Knight, J. W., Bazar, F. W. and Wallace, H. D. 1973. Hormonal regulation of porcine uterine protein secretion. J. Anim. Sci. 36: 546–553.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. J. Anim. Sci. 39: 743–746.CrossRefGoogle ScholarPubMed
Scofield, A. M. 1969. Embryonic mortality in the pig. Ph.D. Thesis, University of Nottingham.Google Scholar
Smidt, D., Scheven, B. and Steinbach, J. 1965. [The influence of lactation on sexual functions in sows.] Züchtungskunde 37: 23–26.Google Scholar
Svajgr, A. J., Hays, V. W., Cromwell, G. L. and Durr, R. K. 1974. Effect of lactation duration on reproductive performance of sows. J. Anim. Sci. 38: 100–105.CrossRefGoogle ScholarPubMed
Varley, M. A. and Cole, D. J. A. 1976a. Studies in sow reproduction. 4. The effect of level of feeding in lactation and during the interval from weaning to remating on the subsequent reproductive performance of the early-weaned sow. Anim. Prod. 22: 71–77.Google ScholarPubMed
Varley, M. A. and Cole, D. J. A. 1976b. Studies in sow reproduction. 5. The effect of lactation length of the sow on the subsequent embryonic development. Anim. Prod. 22: 79–85.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