The main objective of this paper is to establish more detailed feed efficiency measures in Norsvin Landrace to genetically improve feed efficiency without negative consequences for other important traits. The data was provided by Topigs Norsvin, and consisted of records from the boar testing station and the Norwegian litter recording system. Individual feed intake and weight were recorded daily and all boars were computed tomography-scanned to determine their deposition of lean meat and fat at the end of test. In addition, data from purebred Norsvin Landrace sows was available. Two new measures, lean meat- and fat efficiency, were investigated for boars. Total feed intake in the test period was analysed in a multivariate animal model, where fat and lean meat deposition were included as random regression covariates. Significant genetic variation in these new efficiency measurements was detected. Genetic correlations between lean meat efficiency, fat efficiency and sow traits (stayability, body condition score at weaning, total number of piglets born and total litter weight at three weeks of age) were estimated. Two significant genetic correlations were found, between fat efficiency and stayability (0.21 ± 0.11) and between fat efficiency and total litter weight at three weeks (0.21 ± 0.10). There were no significant genetic correlations between lean meat efficiency and the sow traits. These results suggest that selection for fat efficiency could give poorer stayability in sows and reduce the litter weights at three weeks. It might be possible to select for improved lean meat efficiency without a negative effect on important sow traits. Keywords: feed efficiency, body condition score, genetic parameter, maternal line
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Biology - Feed Intake and Efficiency 2, , 576, 2018
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