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Dipeptides or their amino acids administered to a perfused area of the skin in Angora goats

R. Puchala, S. G. Pierzynowski, T. Wuliji, A. L. Goetsch, I. Prieto, T. Sahlu, and M. Lachica

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

Effects of infusion of dipeptides or their amino acids on mohair growth of Angora goats were investigated using a skin perfusion technique. Six Angora wethers (average BW 30 ± 3 kg) were implanted bilaterally with silicon catheters into the superficial branches of the deep circumflex iliac artery and into the deep circumflex iliac vein. For the first 14 d of the experiment, animals were infused into the deep circumflex iliac arteries with a mixture of Met-Leu and Lys-Leu on one side and similar amounts of free amino acids on the other side. The infusion rate of dipeptides were .85 mg Met-Leu and .85 mg Lys-Leu/h in 2.4 ml saline. Infusion rates of amino acids were .474 mg Lys, .483 mg Met and .743 mg Leu/h in 2.4 ml saline. The area of skin supplied by the deep circumflex iliac artery was approximately 300 cm2. An area of 100 cm2 within the perfused region was used to determine mohair growth. Two weeks after the cessation of infusions, perfused areas were shorn. Greasy mohair production from the perfused region was similar for dipeptide infusion compared with free amino acids (5.56 vs 5.69 g/100 cm2 for the 28 d period, respectively, P > .1). However, mohair production was relatively higher than that observed when only saline was infused for 28 d preceding the experiment (4.71 g/100 cm2). No significant changes were observed in concentrations of amino acids, glucose or hormones in blood from the deep circumflex iliac vein (P > .1). In conclusion, the effects of supplementing mohair-producing skin with limiting amino acids given in the free form and as small peptides, had similar effect on mohair growth.


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