Relationships of serum insulin-like growth factor I concentrations to growth, composition, and reproductive traits of swine

Journal of Animal Science
W R LambersonR L Matteri

Abstract

Insulin-like growth factor I (IGF-I) is a peptide hormone that has been shown to be involved in metabolic regulation of growth and reproduction in livestock species. The objectives of this study were to quantify concentrations of IGF-I in growing pigs and determine whether IGF-I concentration can be used as a predictor of growth, composition, and reproductive traits. Forty male and 60 female pigs, divided equally between two locations, were weighed and bled at 3-wk intervals from 6 to 21 wk of age. At each sampling, two blood samples were collected via jugular venipuncture at an interval of at least 1 h. Serum was separated and IGF-I concentration determined via RIA. Pigs were weighed at each sampling date. Backfat and longissimus muscle area were measured with the use of B-mode ultrasound and adjusted to 100 kg. Age at puberty and first-parity litter size were measured on gilts. Effects of age, sex, location, and pig within sex x location on log-transformed IGF-I concentrations were determined by analyzing data as a split-plot. Performance traits were fitted to a model including the effects of IGF-I concentration, sex, location, and interactions. The IGF-I concentrations increased (P < .05) from 3 to 18 wk of age before droppi...Continue Reading

Citations

Jan 16, 2007·Molecular Reproduction and Development·L MartinR S Prather
Apr 14, 2007·Journal of Animal Science·E L BergD H Keisler
Nov 15, 2018·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Kerry V Fanson, Peter A Biro
Jul 14, 2000·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·F ChanetsaD H Keisler

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