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Effect of triiodothyronine (T3) administered to a perfused area of 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

The effect of T3 infusion on mohair growth of Angora goats was investigated using a skin perfusion technique. Six Angora wethers (32 kg) were implanted bilaterally with catheters into the superficial branches of the deep circumflex iliac artery and deep circumflex iliac vein. For the first 14 d of the experiment animals were infused into the deep circumflex iliac arteries with a T3 (one side) and saline (other side, both at 2.4 mL/h). The infusion rate of T3 was 144 g/d, estimated to triple T3 blood concentration in the perfused region. 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. Decreased concentrations of Met, Cys, Lys, Phe, Val, Ileu, Leu, and insulin were observed in the venous blood taken from the deep circumflex iliac vein on the side infused with the T3 compared with blood taken from the saline side (P < .05). Greasy mohair production from the perfused region was increased by T3 infusion compared with the side infused with saline (2.69 vs 2.05 g/100 cm2/28 d, P < .005). Direct skin infusion with T3 resulted in mobilization of amino acids for increased protein synthesis and also affected energy distribution by changing insulin concentration.


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