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|Title:||Estimates of Genetic Correlations between IGF-1 recorded at 4 weeks of age and individual piglet weights at birth and 14 days, along with lifetime growth rate and backfat||Contributor(s):||Hermesch, S (author) ; Bunter, Kim L (author); Luxford, BG (author)||Publication Date:||2001||Handle Link:||https://hdl.handle.net/1959.11/906||Abstract:||Insulin-like growth factor-1 (IGF-1) was recorded for 9990 pigs at four weeks of age. These data were used to estimate genetic correlations between juvenile IGF-1 and performance traits recorded on the piglet or at later ages. Estimates of heritability and litter effects for IGF-1 were 0.24±0.03 and 0.13±0.01. The genetic correlation between juvenile IGF-1 and piglet weight at birth (IPWB) was -0.33±0.19. In contrast, juvenile IGF-1 had a low positive genetic correlation with piglet growth rate from birth to 14 days (ADG14). A similar pattern of genetic correlations was observed between backfat (BF) and piglet traits. Backfat had a negative genetic correlation with IPWB (rg: -0.43±0.17), but a positive genetic correlation with ADG14 (rg: 0.15±0.19). Further, juvenile IGF-1 had a strong positive genetic correlation with BF (rg: 0.46±0.08). These genetic correlations support a downward selection strategy for juvenile IGF-1. It is speculated that these results, in combination with those from other studies, provide clues as to why juvenile IGF-1, in contrast to IGF-1 measured in finishing pigs, is an appropriate selection criterion for improving the efficiency of lean meat production.||Publication Type:||Conference Publication||Conference Name:||14th Conference of the Association for the Advancement of Animal Breeding and Genetics, Queenstown, New Zealand, 30th July - 2nd August, 2001||Conference Details:||14th Conference of the Association for the Advancement of Animal Breeding and Genetics, Queenstown, New Zealand, 30th July - 2nd August, 2001||Source of Publication:||Proceedings of the 14th Conference of the Association for the Advancement of Animal Breeding and Genetics: Biotechnology, p. 227-230||Publisher:||AAABG: Association for the Advancement of Animal Breeding and Genetics||Place of Publication:||Australia||Field of Research (FOR):||070201 Animal Breeding||Peer Reviewed:||Yes||HERDC Category Description:||E1 Refereed Scholarly Conference Publication||Other Links:||http://www.aaabg.org/aaabg18/
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