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The effect of condition at service and plane of nutrition in early pregnancy in the sow 1. Uterine and extra-uterine changes

Published online by Cambridge University Press:  02 September 2010

I. H. Pike  and
T. G. Boaz
I. H. Pike
Affiliation:
Department of Animal Physiology and Nutrition, Agricultural Sciences Building, The University, Leeds
T. G. Boaz
Affiliation:
Department of Animal Physiology and Nutrition, Agricultural Sciences Building, The University, Leeds
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Summary

Twelve sows (F) were fed 7·3 kg/day and twelve (T) 3·7 kg/day of a 16% crude protein (CP) diet for the last 5 weeks of an 8-week lactation, so that at the subsequent service F sows were heavier (16%) and in better condition.

From service to slaughter 70 days later, sows received either 3·7 kg/day (H) or 1·8 kg/day (L) of a 15% CP diet, giving four treatment combinations; FH, FL, TH and TL.

In pregnancy H sows gained more weight than L sows and, on the low plane, F sows gained more weight than T sows. Ovulation rate as measured by corpora lutea count at slaughter was higher for TH than TL sows and for FL sows than FH sows. A combination of low ovulation rate and high mortality rate gave fewer foetuses (10·0) in the TL sows than in sows on the other treatments (13·5). Similarly mean foetal weight and thus foetal litter weight was least in TL sows. Foetal membranes, uterine fluids and uterine wall were lighter at slaughter in T sows than F sows and lighter in L sows than H sows, those of TL sows being appreciably the lightest.

The results indicate that when the sow is in poor condition at service, body reserves being depleted, the uterus and its contents become more vulnerable to adverse pregnancy nutrition.

Type
Research Article
Information
Animal Production , Volume 15 , Issue 2 , October 1972 , pp. 147 - 155
Copyright
Copyright © British Society of Animal Science 1972

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