Journal article
Genetic variation and responses in reproductive performance of sows in lines selected for growth rate under restricted feeding
Animal Science, Vol.82(1), pp.7-12
2006
Abstract
The objective of this study was to examine genetic changes in reproduction traits in sows (total number born (TNB), number born alive (NBA), average piglet birth weight (ABW) and number of piglets weaned (NW), body weight prior to mating (MW), gestation length (GL) and daily food intake during lactation (DFI)) in lines of Large White pigs divergently selected over 4 years for high and low post-weaning growth rate on a restricted ration. Heritabilities and repeatabilities of the reproduction traits were also determined. The analyses were carried out on 913 litter records using average information-restricted maximum likelihood method applied to single trait animal models. Estimates of heritability for most traits were small, except for ABW (0·33) and MW (0·35). Estimates of repeatability were slightly higher than those of heritability for TNB, NBA and NW, but they were almost identical for ABW, MW, GL and DFI. After 4 years of selection, the high growth line sows had significantly heavier body weight prior to mating and produced significantly more piglets born alive with heavier average birth weight than the low line sows. There were, however, no statistical differences between the selected lines in TNB or NW. The lower food intake of high relative to low line sows during lactation was not significant, indicating that daily food intake differences found between grower pigs in the high and low lines (2·71 v. 2·76 kg/day, s.e.d. 0·024) on ad libitum feeding were not fully expressed in lactating sows. It is concluded that selection for growth rate on the restricted ration resulted in beneficial effects on important measures of reproductive performance of thea sows.
Details
- Title
- Genetic variation and responses in reproductive performance of sows in lines selected for growth rate under restricted feeding
- Authors
- Nguyen Hong Nguyen (Author) - University of QueenslandC P McPhee (Author) - Queensland Department of Primary Industries and FisheriesC M Wade (Author) - University of Queensland
- Publication details
- Animal Science, Vol.82(1), pp.7-12
- Publisher
- Cambridge University Press
- Date published
- 2006
- DOI
- 10.1079/ASC20052
- ISSN
- 1357-7298
- Copyright note
- Copyright © 2006 The Authors. Reproduced here in accordance with the publisher's copyright policy.
- Organisation Unit
- School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering; Centre for Bioinnovation
- Language
- English
- Record Identifier
- 99450507702621
- Output Type
- Journal article
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