Please use this identifier to cite or link to this item:
|Title:||Insulin-like growth factor-I measured in juvenile pigs is genetically correlated with economically important performance traits||Contributor(s):||Bunter, Kim L (author); Hermesch, S (author) ; Luxford, BG (author); Graser, HU (author); Crump, RE (author)||Publication Date:||2005||DOI:||10.1071/EA05048||Handle Link:||https://hdl.handle.net/1959.11/852||Abstract:||Insulin-like growth factor-I (IGF-I) is a naturally occurring polypeptide produced in the liver, muscle and fat tissues. It is known to be associated with growth and development during the postnatal growth period. Evidence for strong genetic correlations between juvenile IGF-I and performance traits would suggest this physiological measure would be useful as an early selection criterion. This paper reports estimates of genetic parameters from 9 trials where IGF-I was measured in juvenile pigs. All trials involved populations undergoing active selection for improved performance (e.g. efficient lean meat growth). Juvenile IGF-I was moderately heritable (average h 2: 0.31) and influenced by common litter effects (average c 2 : 0.15). Genetic correlations (r g) between juvenile IGF-I and backfat (BF), feed intake (FI) or feed conversion ratio (FCR) traits were generally large and positive: r g averaged 0.57, 0.41 and 0.65, respectively. Phenotypic correlations (r p) between juvenile IGF-I and BF, FI or FCR were much lower (r p averaged 0.21, 0.09, and 0.15, respectively) as residual correlations between IGF-I and these performance traits were low, consistent with being measured at very different times. Correlations (genetic or phenotypic) between juvenile IGF-I and growth traits (e.g. lifetime daily gain or test daily gain) were relatively low, with average values within ± 0.09 of zero. Results from the trials reported here, and several physiological studies, indicate that information on juvenile IGF-I concentration can be used as an early physiological indicator of performance traits traditionally measured later in life. There is a clear role for juvenile IGF-I to facilitate pre-selection and more accurate selection of livestock for hard to measure traits, such as FCR, in pig breeding programs.||Publication Type:||Journal Article||Source of Publication:||Australian Journal of Experimental Agriculture, 45(8), p. 783-792||Publisher:||CSIRO Publishing||Place of Publication:||Victoria, Australia||ISSN:||0816-1089||Field of Research (FOR):||070201 Animal Breeding||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Statistics to Oct 2018:||Visitors: 244
|Appears in Collections:||Journal Article|
Files in This Item:
checked on Nov 26, 2018
checked on Mar 5, 2019
Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.