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Logo Leibniz Institute for Farm Animal Biology
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Arch. Anim. Breed., 60, 161-173, 2017
https://doi.org/10.5194/aab-60-161-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Original study
14 Jun 2017
Effect of the IGF-I gene polymorphism on growth, body size, carcass and meat quality traits in Coloured Polish Merino sheep
Ewa Grochowska1, Bronisław Borys2, Piotr Janiszewski3, Jan Knapik4, and Sławomir Mroczkowski1 1Department of Genetics and General Animal Breeding, UTP University of Science and Technology, Bydgoszcz, Poland
2National Research Institute of Animal Production, Experimental Station, Kołuda Wielka, Poland
3Department of Meat and Fat Technology, Prof. Wacław Dąbrowski Institute of Agricultural and Food Biotechnology, Warsaw, Poland
4National Research Institute of Animal Production, Balice, Poland
Abstract. Insulin-like growth factor I, encoded by the IGF-I gene, plays a role in cell growth and differentiation, embryogenesis, metabolism regulation, skeletal growth, and protein synthesis. The aims of this study were to investigate the polymorphism in the 5′ flanking region of the IGF-I gene and evaluate associations between the single-nucleotide polymorphism (SNP) in this gene and growth, body size, carcass and meat quality traits in Coloured Polish Merino sheep. In total 78 live and post mortem traits were investigated. Polymorphism in the IGF-I gene was identified with the use of the polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) method in 305 Coloured Polish Merino sheep. In association studies, traits of interest were analysed with the use of the MIXED and GENMOD procedures of the SAS statistical package. Two alleles named A and B, and two IGF-I genotypes – AA and AB – were detected. The A allele and the AA genotype were predominant, with the frequencies of 91.6 and 83.3 %, respectively. The IGF-I genotype was found to have a highly significant effect on fore shank weight (P  =  0.006), kidney fat class (P  =  0.002) and EUROP fat class (P  =  0.005). Furthermore, the IGF-I genotype significantly affected external fatness of carcass class (P  =  0.038), drip loss (P  =  0.049), and subjective assessment of meat colour (P  =  0.043), and it tended to be associated with longissimus dorsi (LD) muscle width (P  =  0.063) and flavour (0.067). Concluding, the IGF-I gene could be considered as a candidate gene of selected carcass and meat quality traits in sheep.

Citation: Grochowska, E., Borys, B., Janiszewski, P., Knapik, J., and Mroczkowski, S.: Effect of the IGF-I gene polymorphism on growth, body size, carcass and meat quality traits in Coloured Polish Merino sheep, Arch. Anim. Breed., 60, 161-173, https://doi.org/10.5194/aab-60-161-2017, 2017.
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The aim of this study was to investigate the polymorphism in the IGF-I gene and its associations with growth, body size, carcass and meat quality traits in Coloured Polish Merino sheep. The IGF-I genotype was found to have an effect on fore shank weight, kidney fat class and EUROP fat class, external fatness on carcass class, drip loss, and subjective assessment of meat colour. The IGF-I gene could be considered as a candidate gene of selected carcass and meat quality traits in sheep.
The aim of this study was to investigate the polymorphism in the IGF-I gene and its associations...
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