Preliminary results on between and within twin set variation in insulin-like growth factor I (IGF-1) and some relationships with performance traits in identical twin heifers |
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| Affiliation: | 1. Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China;2. Department of Animal Production, College of Agriculture, Alzaiem Alazhari University, Khartoum North 13311, Sudan;3. Department of Animal Genetic, Breeding and Reproduction, College of Animal Production, University of Bahri, Khartoum North 1660, Sudan;4. Animal Production Research Center, KuKu, Animal Resources Research Corporation, Sudan;1. Ligandis GbR, Gülzow, Germany;2. Institute of Genome Biology, Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf, Germany;3. Clinic for Swine and Small Ruminants, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany;4. Institute of Behavioural Physiology, Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf, Germany;5. Institute for Farm Animal Research and Technology, University of Rostock, Rostock, Germany;6. Hoffmann-La Roche Ltd., Pharma Research & Early Development Neuroscience (pRED), Basel, Switzerland |
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| Abstract: | Blood samples were collected from eight sets of Simmental crossbred identical twin heifers at 291. 328, 254, 656 and 684 days of age and were assayed for serum concentrations of insulin-like growth factor 1 (IGF-1). The between twin set intraclass correlation for IGF-1 at these ages was −0.08±0.38, 0.25±0.35, 0.62±0.23, 0.68±0.21 and 0.54±0.27, respectively. Residual correlations of serum IGF-1 concentrations with weights taken at the same ages ranged from 0.29 (P > 0.10) to 0.74 (P < 0.01). Heifers with higher serum IGF-1 concentrations at 291, 354, 656 and 684 days of age tended to be taller at 291 and 656 days of age with correlations ranging from 0.25 (P > 0.10) to 0.61 (P < 0.05). Correlations of IGF-1 with weight gains were variable in sign and generally nonsignificant. Results indicate that serum concentrations of IGF-1 are positively related to body weight and hip height of beef heifers. |
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