The response of broiler chicks to L-Threonine supplementation in low protein corn-soybean diet.
Abstract: Two experiments were conducted using 460 Hubbard chicks, one-day-old to investigate: 1) The response of broiler chicks to threonine (Thr) supplementation in low protein corn-soy diets; and 2) Whether the low protein diets (19% and 17%CP) supplemented with methionine (Met) , lysine (Lys) and Thr produce performanc equal to that obtained from the NRC recommended diets (23% CP from 0 to 3 weeks of age and 20% CP from 4 to 6 weeks of age). In Experiment 1, six graded levels of Thr (0.00, 0.05, 0.15, 0.20 and 0.25%) were supplemented to a 23% CP diet as fortified with adequate amount of Met and Lys and compared with a 23% CP diet as recommended by NRC (1994) for broiler 0-3 weeks of age. In Experiment 2, a 17% CP diet contained adequate amount of Met and Lys was supplemented with the same levels of Thr used in Experiment 1 and compared with a 20 % CP diet as recommended by NRC (1994) for broilers 4-6 weeks of age.
In both experiments, body weights increased numerically and feed conversion improved significantly when low protein diets were supplemented with Thr. The maximal body weight and feed conversion were achived at 0.78% total Thy (0.69% digestive Thy) from 0 to 3 weeks of age. However, from 4 to 6 weeks of age, body weight and feed conversion were maximized at 0.72% total Thr (0.64% digestible Thr). Chicks fed the 19% CP diet supplemented with Met, Lys, and Thy had growth rate and feed efficiency equal to those of the 23% CP, NRC diet. Similarly performance of chichs fed the 17% CP supplemented with Met, Lys and Thr was equal to that obtained from the 20% CP, NRC diet. The low protein diets supplemented with amino acids were economical and had no negative impacts on carcass characteristics or mortality rate.
Keywords: L. threonine, amino acids, protein, broiler.
Publication year 2000
Availability location معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
Availability number
Organization Name
Country Egypt
City الاسكندرية
serial title All Africa/ESAP Conference of Animal Production, Egypt, Nov. 6-9.
Department Poultry Nutrition Research Department
Author(s) from ARC
Agris Categories Animal feeding
AGROVOC
TERMS		 Broiler chickens. Maize. Proteins. Soybeans. Threonine.
Publication Type Conference/Workshop
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