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Effects of dietary supplementation and parity of dam on plasma concentrations of Insulin-like growth factor (IGF)-I and IGF-binding protein-3 during post-partum period in dromedary camels

Mohamed Hammadi, Mohamed Chniter, Touhami Khorchani, Robert Renaville.

Abstract
This study aimed to investigate the effects of concentrate supplement around postpartum period on plasma concentrations of insulin-like growth factor (IFG-I) and IGF-binding protein-3 in camels (Camelus dromedarius). Eighteen pregnant females were divided into supplemented (n = 9; S) and a non-supplemented (n = 9; C) experimental groups. During day, animals grazed 7 to 8 h on salty pasture and during night, they were kept in pen, where each female in group S received 4 kg/d of concentrate supplement during the last 3 months of pregnancy and 5 kg/d during the first 3 months postpartum. Plasma concentration of IGF-I was more dependent on the dietary level (P < 0.01) than on parity of dams (P > 0.05). Overall mean was more than threefold in group S (31.2 12.0 ng/ml) than in group C (9.64.4 ng/ml). Relative plasma concentration of IGFBP-3 was affected by dietary and parity effects (P < 0.01). It was more important in supplemented and primiparous groups than in non-supplemented and multiparous groups. A positive correlation (r = 0.45; P < 0.001) was found between plasma IGFBP-3 and IGF-I concentrations of dromedary females in postpartum period. In conclusion, concordance of increasing between plasma concentrations of IGF-I and IGFBP-3, and energy balance was confirmed for dromedary.

Key words: Dromedary, Dietary supplementation, IGF-I, IGFBP-3



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