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Effects of insulin administered to a perfused area of skin on mohair growth in Angora goats

R. Puchala, S. G. Pierzynowski, A. L.Goetsch, and T. Sahlu

E (Kika) de la Garza American Institute for Goat Research, Langston University, Langston, OK

The effect of insulin on mohair growth of Angora goats was investigated using a skin perfusion technique. Seven Angora wethers (average BW 32 ± 4 kg) were implanted bilaterally with silicon catheters into the superficial branches of the deep circumflex iliac artery and vein. Goats were shorn before the 28 d experimental period. For the first 14 d of the experiment, the deep circumflex iliac arteries were infused with 2.4 mL/h of saline solution. The infusate for one side contained insulin, delivered at 48 mIU/h and estimated to triple the blood concentration in the perfused region. The area of skin supplied by the deep circumflex iliac artery was approximately 250 cm2. An area of 100 cm2 within the perfused region was used to determine mohair growth. Two weeks after cessation of infusions, perfused areas were shorn. Greasy and clean mohair production from the perfused region was not affected by insulin infusion compared with the side infused with saline (4.57 vs 4.69 and 3.67 vs 3.74 g/(100 cm2 x 28 d), respectively; P > 0.10). Similarly, insulin did not change mohair fiber diameter or length (P > 0.10). Plasma glucose concentration was lower (P < 0.05) in blood from the deep circumflex iliac vein on the side infused with insulin vs the control side (57.2 vs 63.4 mg/dL). Blood flow and plasma concentrations of amino acids were not different between treatments (P > 0.10). The lack of an insulin effect on mohair fiber growth may be due to limited influence on fiber producing follicles.


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