Maintenance valine, isoleucine, and tryptophan requirements for poultry

Poultry Science
M B de LimaJ B K Fernandes

Abstract

Poultry maintenance requirements for valine, isoleucine, and tryptophan were measured by nitrogen balance using different unit systems. The nitrogen balance trial lasted 5 d with 48 h of fasting (with roosters receiving only water+sucrose) and the last 72 h for feeding and excreta collection. Forty grams of each diet first-limiting in valine, isoleucine, or tryptophan was fed by tube each day (3 d) to give a range of intakes from 0 to 101, 0 to 119, and 0 to 34 mg/kg BW d of valine, isoleucine, and tryptophan, respectively. A nitrogen-free diet containing energy, vitamins, and minerals, meeting the rooster requirements, was offered ad libitum during these three d. To confirm that the amino acids studied were limiting, a treatment was added with a control diet formulated by adding 0.24 g/kg of L-valine, 0.21 g/kg of L-isoleucine, and 0.10 g/kg of L-tryptophan to the diets with lower amino acid level. Excreta were collected during the last 3 d of the balance period and the nitrogen content of the excreta was analyzed. For each amino acid, a linear regression between nitrogen retention (NR) and amino acid intake was performed. The equations from linear regression were: NR=-98.6 (±10.1)+2.4 (±0.2)×Val, NR=-46.9 (±7.1)+2.3 (±0.1)×Il...Continue Reading

References

Jul 1, 1978·British Poultry Science·T R Morris, E Wethli
Jul 1, 1978·British Poultry Science·E Wethli, T R Morris
Mar 1, 1992·British Poultry Science·D Burnham, R M Gous
Jul 1, 1991·British Poultry Science·G HuyghebaertT R Morris
Apr 1, 1985·British Poultry Science·M W McDonald, T R Morris
Mar 26, 2003·The British Journal of Nutrition·Shuhei EbaraYoshihisa Nakano
Jan 5, 2014·Journal of Animal Science and Biotechnology·William Jon MeadusWilliam R Caine

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