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Body development in sows, feed intake and maternal capacity. Part 2: gilt body condition before and after lactation, reproductive performance and correlations with lactation feed intake

Published online by Cambridge University Press:  22 July 2011

C. R. G. Lewis  and
K. L. Bunter
C. R. G. Lewis*
Affiliation:
Animal Genetics and Breeding Unit (AGBU), University of New England, Armidale, NSW, 2350, Australia
K. L. Bunter
Affiliation:
Animal Genetics and Breeding Unit (AGBU), University of New England, Armidale, NSW, 2350, Australia
*
†E-mail: clewis21@une.edu.au
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Abstract

Data on sow body weight (BW) and fatness (n = ∼2250 pregnant sows) and reproductive data (including historical: n = ∼18 000) were used to examine the genetic and phenotypic associations between body condition before and after farrowing, gestational outcomes, lactation feed intake and the gilts’ ability to survive unculled to farrow in the second parity. Within-trait genetic correlations were very high between weight (0.77 ± 0.06) and fat depth (0.91 ± 0.04) recorded before farrowing and at weaning. Litter size traits were generally uncorrelated genetically with aspects of sow BW and body condition. However, genetic correlations indicated that sows producing heavier piglets at birth had litters with increased gain (0.36 ± 0.16), and were characterised by greater weight (−0.72 ± 0.08) and fat change (−0.19 ± 0.15) during lactation, reflected to a lesser extent by lower weight (−0.12 ± 0.11) and fatness (−0.17 ± 0.10) at weaning. Genetic correlations (ra) between reproductive traits and lactation feed intake were generally low, but favourable. However, lactation intake was positively correlated with measures of sow size (ra = ∼0.55), such that selection for lactation feed intake would likely be accompanied by increased mature sow size. Phenotypic correlations (rp) showed that sow survival to the second parity (FAR12) was positively influenced by litter size and fat depth at weaning, supporting attributes of increased fatness before farrowing, less weight loss during lactation and an increased lactation intake.

Keywords

heritabilitygenetic parameterslongevitystayability
Type
Full Paper
Information
animal , Volume 5 , Issue 12 , 10 November 2011 , pp. 1855 - 1867
Copyright
Copyright © The Animal Consortium 2011

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