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Effect of feeding level during rearing and mating strategy on performance of Swedish Yorkshire sows. 1. Growth, puberty and conception rate

Published online by Cambridge University Press:  18 August 2016

Y. Le Cozier ,
E. Ringmar-Cederberg ,
S. Johansen ,
J. Y. Dourmad ,
M. Neil  and
S. Sterna
Y. Le Cozier
Affiliation:
Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, Funbo-Lövsta, S-755 97 Uppsala, Sweden
E. Ringmar-Cederberg
Affiliation:
Department of Animal Breeding and Genetics, Centre for Reproductive Biology, Swedish University of Agricultural Sciences, Funbo-Lövsta, S-755 97 Uppsala, Sweden
S. Johansen
Affiliation:
Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, Funbo-Lövsta, S-755 97 Uppsala, Sweden
J. Y. Dourmad
Affiliation:
INRA, Station de Recherches Porcines, 35590 Saint-Gilles, France
M. Neil*
Affiliation:
Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, Funbo-Lövsta, S-755 97 Uppsala, Sweden
S. Sterna
Affiliation:
Department of Animal Breeding and Genetics, Centre for Reproductive Biology, Swedish University of Agricultural Sciences, Funbo-Lövsta, S-755 97 Uppsala, Sweden
*
To whom correspondence should be addressed
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Abstract

From 74 to 180 days of age, a complete diet was offered either ad libitum (AL) or at proportionately 0·8 of the observed consumption (R) to two groups of purebred Yorkshire gilts, comprising 128 and 127 animals, respectively. Half of the animals in each group was served at the first detected oestrus, and the other half at the third detected oestrus, according to a plan defined at the start of the experiment. Animals which failed to show oestrus before 240 days of age were culled.

At 100 kg live weight (LW), AL gilts were younger (-20 days) and had thicker backfat (+2.3 mm) than R gilts. At the first detected oestrus, AL females were also younger (198 v. 203 days), heavier (127 v. 117 kg LW) and fatter (17·8 v. 14·7 mm backfat thickness) than R gilts. No difference between feeding treatments during rearing was observed in the percentage of females detected on heat before day 240. Seventy-three animals were culled from the start of the experiment until service, half of them (54%) failing to show oestrus. At service, LW and backfat thickness in the four treatments ranged from 117 to 148 kg LW and 14·9 to 19·7 mm, respectively. The body fatness, estimated from the ratio of backfat to LW, was higher in AL than in R gilts (0·14 and 0·12 , respectively), whereas no difference was observed between E1 and E3 gilts (0·13 on average). After the first service 15% of the gilts came back into heat but the conception rate was not affected by feeding treatment during rearing.

Keywords

giltsestruspubertyrestricted feedingunrestricted feeding
Type
Research Article
Information
Animal Science , Volume 68 , Issue 3 , April 1999 , pp. 355 - 363
Copyright
Copyright © British Society of Animal Science 1999

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