Dietary tryptophan effects on growth and stress responses of male broiler chicks |
| |
| Authors: | Corzo A Kidd M T Thaxton J P Kerr B J |
| |
| Institution: | Department of Poultry Science, Mississippi State University, MS 39762, USA. acorzo@poultry.msstate.edu |
| |
| Abstract: | 1. Three experiments were conducted to determine growth of broiler chicks fed on test diets formulated to be deficient or adequate in tryptophan (Trp) using gelatin by-product as a means of generating a Trp deficiency. Growth response estimates of broiler chicks to graduations of Trp were determined by dose-response criteria and regression analyses. Experiments were conducted using broiler chicks from 1 to 20 d of age. 2. Broiler chicks fed Trp-deficient diets had poor body weight gain, feed intake and feed conversion. Recommended total Trp needs were 2.0, 2.1 and 2.2 g/kg for feed intake, body weight gain and feed conversion, respectively. 3. Blood plasma Trp exhibited a sigmoidal trend while blood plasma glucose increased in a linear manner to supplemental Trp. Physiological stress variables measured were unaffected by dietary Trp. |
| |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ |
|
