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Growth and carcass traits in pigs after selection for lean tissue growth rate on low and high protein diets

Published online by Cambridge University Press:  02 September 2010

S. Stern ,
N. Lundeheim  and
K. Andersson
S. Stern
Affiliation:
Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Funbo-Lövsta, S–755 97 Uppsala, Sweden
N. Lundeheim
Affiliation:
Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Funbo-Lövsta, S–755 97 Uppsala, Sweden
K. Andersson
Affiliation:
Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Funbo-Lövsta, S–755 97 Uppsala, Sweden
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Abstract

Two lines of pigs that had been selected for five generations for lean tissue growth rate (LTGR) on a high (HP) or low (LP) protein diet were evaluated on a commercial diet (165 g crude protein per kg diet). The growth characteristics of 534 animals were measured, and carcass data were obtained on 405 animals. Differences between lines were tested for significance taking genetic drift into account. The animals from the HP-line grew faster both before and during the test and were 6·5 days younger at slaughter than the LP-line pigs. The HP-line pigs had a higher lean content (587 v. 558 g/kg) and a thinner backfat layer (17·8 v. 22·7 mm) than the LP-line. LTGR was higher in the HP-line (374 v. 347 g/day). No significant differences between lines were found in meat quality or in the incidence of osteochondrosis in elbow or knee. The realized differences between lines confirm that selection for LTGR on a high protein diet was more effective in improving both leanness and growth rate compared with selection for LTGR on a low protein diet.

Keywords

dietary proteingrowth rateleannesspigsselection
Type
Research Article
Information
Animal Science , Volume 61 , Issue 2 , October 1995 , pp. 341 - 346
Copyright
Copyright © British Society of Animal Science 1995

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