Effects of dietary protein source on fleece and live weight gain in Angora doelings
A. J. Litherland, T. Sahlu, C. A. Toerien, R. Puchala, K. Tesfai, and A. L. GoetschSmall Ruminant Research 38:29-36. 2000.
The US Angora goat, on a BW basis, is one of the highest fleece-producing ruminants. Mohair growth requires litle energy but much protein is needed. In particular, requirements for the sulfur-containing amino acids cysteine and methionine are high. However, the array of amino acids needed for fleece-free BW gain is different from that needed for fiber growth. Thus, diets containing supplemental protein sources promoting high BW gain may not necessarily do so for fiber growth, which would be of special importance for growing, fiber-producing ruminants, such as yearling Angora doelings typically bred for kidding at 2 years of age. Therefore, objectives of this study were to determine if different common supplemental dietary protein sources have similar effects on live weight and mohair growth in yearling Angora doelings. Fifty-one yearling Angora doelings (20 ± 0.6 kg initial BW) were used; diets consisted of approximately 40% roughage and 18 to 19% CP (DM basis), of which two-thirds was supplied by corn gluten meal, cottonseed meal, hydrolyzed feather meal or Menhaden fish meal; DM intake was restricted at approximately 0.7 kg/day. Results of this experiment indicate that dietary characteristics promoting high growth or BW gain may not be those most conducive to high mohair growth. In this particular instance, a diet with supplemental fish meal resulted in greater ADG than diets with feather, corn gluten or cottonseed meals, whereas corn gluten meal yielded greatest mohair growth. Further research is necessary to fully understand how dietary properties and nutrient status affects BW gain and mohair growth by yearling Angoras.
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