Effects of amino acids administered to a perfused area of the skin in Angora goats
R. Puchala, S.G. Pierzynowski, T. Sahlu and S.P. HartJournal of Animal Science 73:565-570. 1995.
The effect of amino acid infusion on mohair growth of Angora goats was investigated using a skin perfusion model. Four Angora wethers (average BW 32±2 kg) were implanted bilaterally with silicon catheters into the superficial branches of the deep circumflex iliac artery and to the deep circumflex iliac vein. For the first 14 d of the experiment animals were infused to the deep circumflex iliac arteries with either a mixture of amino acids (one side) or saline (other side). The infusion rates of amino acids were 0.36 mg Met-15N, 0.36 mg Lys and 0.72 mg Leu h-1. The area of skin supplied by the deep circumflex iliac artery was approximately 300 cm2 and a tattoo 10 cm x 15 cm was made in the middle of the perfused region. Two weeks after cessation of infusions animals were shorn and the mohair from the tattooed region taken for determination of greasy and clean mohair production, fiber length and diameter. Greasy and clean mohair production from the tattooed region were increased by AA infusion compared to the side infused with saline (3.51 vs 3.16 g, P<0.04 and 3.13 vs 2.70 g, P<0.07, respectively). No significant changes were observed in mohair length or diameter. Decreased concentrations of valine, threonine, arginine, glycine and histidine were observed in the venous blood taken from the deep circumflex iliac vein on the side infused with the AA mixture compared with blood taken from the saline side (P<0.05). There were no treatment differences in T3, T4 or insulin concentrations in venous blood taken from the deep circumflex iliac veins. Plasma cortisol concentration was reduced (1.38 vs 2.61 g dL-1, P<0.05) in the venous blood taken from the AA infused side. Skin has the capacity for increased utilization of methionine, lysine and leucine. Direct skin infusion with those AA resulted in either mobilization of other AA for increased protein synthesis, or the infused AA acted as factors that stimulated skin AA uptake.
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