Dietary protein levels alter plasma insulin-like growth factor-I concentration of chicks
1999
Kita, K. (Nagoya Univ. (Japan). Faculty of Agriculture) | Okumura, J.
The plasma concentration of glucose, free fatty acid, triacylglycerol, cholesterol, albumin, protein, insulin-like growth factor-I (IGF-I) was measured in chicks (7-d-old) given diets with varying dietary protein levels (0. 10, 20, 40 and 60 % protein) ad libitum for 10 days. Plasma glucose concentration decreased with rising dietary protein levels from 10 to 40 %. When dietary protein levels increased from 0 to 60 %, plasma cholesterol concentration decreased significantly. Plasma IGF-I concentration increased significantly with elevating dietary protein levels up to 20 %, and above the level, it decreased gradually. The response of body weight change in chicks to the alteration in nutritional condition such as dietary protein levels over 10 days would be partially regulated by the change in plasma IGF-I concentration
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