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The Effect of Food Intake During Lactation and Early Pregnancy on Plasma Progesterone Concentrations and Prolificacy in Multiparous sows

Published online by Cambridge University Press:  22 November 2017

G.R. Prime ,
M.A. Varley  and
H.W. Symonds
G.R. Prime
Affiliation:
Dept. of Animal Physiology & Nutrition, University of Leeds, LS2 9JT
M.A. Varley
Affiliation:
Dept. of Animal Physiology & Nutrition, University of Leeds, LS2 9JT
H.W. Symonds
Affiliation:
Dept. of Animal Physiology & Nutrition, University of Leeds, LS2 9JT
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Extract

High food intake in early pregnancy resulted in increased prenatal mortality and reduced subsequent litter size in many studies using gilts (den Hartog and Van Kempen, 1980). With multiparous sows there is generally no difference in the rate of embryo survival or litter size with high feeding in early pregnancy (Toplis et al, 1983, Dyck & Cole, 1986).

Limited evidence suggests that sows fed low levels in lactation and then a high level early in the following pregnancy may show increased rates of embryo mortality (Pike and Boaz, 1972; Hughes et al, 1984). The effect of high feeding may be due to low plasma progesterone concentrations (Hughes et al 1984; Dyck et al, 1980) in early pregnancy which may be associated with reduced embryo survival and litter size.

This study was designed to investigate the effects of high or low feed intake in lactation and early pregnancy on plasma progesterone concentrations in early pregnancy and subsequent litter size using multiparous sows.

Type
Reproductive Physiology
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1988 , March 1988 , pp. 55
Copyright
Copyright © The British Society of Animal Production 1988

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References

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