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Lactational oestrus in the sow. 3. The Influence of feeding level upon the occurrence of a fertile oestrus in lactating sows

Published online by Cambridge University Press:  02 September 2010

P. Rowlinson  and
M. J. Bryant
P. Rowlinson
Affiliation:
Department of Agriculture and Horticulture, University of Reading, Earley Gate, Reading RG6 2AT
M. J. Bryant
Affiliation:
Department of Agriculture and Horticulture, University of Reading, Earley Gate, Reading RG6 2AT
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Abstract

Sixty-six multiparous hybrid Camborough female pigs and their litters were housed in groups of five or six at day 20 post partum. A boar was added to each group on day 21. Four groups (a total of 22 sows) were fed to appetite (TA), to requirement (R) or to 0·70 of requirement (RO·70). Average daily sow food intakes were 8·2, 61 and 4·5 kg for TA, R and RO·70 respectively. Significant differences occurred in live-weight changes between grouping and weaning (TA>R>RO·70; P<0·001). TA sows were heavier at weaning than either R or RO·70 sows (P< 0·001).

Oestrus occurred during lactation in 0·68, 0·73 and 0·18 of sows, on average 11·3, 13·4 and 8·0 days following grouping respectively, for TA, R and RO·70 sows but these differences were statistically non-significant. The average non-return rate at day 21 was 0·69, with no differences between treatments.

Type
Research Article
Information
Animal Production , Volume 35 , Issue 1 , August 1982 , pp. 49 - 53
Copyright
Copyright © British Society of Animal Science 1982

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References

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