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http://dx.doi.org/10.5713/ajas.2007.939

Lysine Requirement of Broiler Chickens Fed Low-density Diets under Tropical Conditions  

Aftab, Usama (Department of Plant Sciences, Quaid-i-Azam University)
Ashraf, Muhammad (Department of Plant Sciences, Quaid-i-Azam University)
Mumtaz, Abdul Samad (Department of Plant Sciences, Quaid-i-Azam University)
Jiang, Zhirong (Ajinomoto Co., (Thailand) Ltd.)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.20, no.6, 2007 , pp. 939-943 More about this Journal
Abstract
Two experiments were conducted to determine the lysine requirement of straight-run broiler chickens ($Hubbard{\times}Hubbard$) during the period 4-21 (Exp. 1) and 21-40 (Exp. 2) days of age. Experiments were conducted during the summer months (June-August) in open-sided houses, thus exposing chicks to chronic heat stress. Daily min-max temperature averaged $28-40^{\circ}C$ (Exp. 1) and $28-36^{\circ}C$ (Exp. 2). Lysine deficient basal diets were formulated to contain low-nutrient-density, i.e., 2,700 kcal per kg ME, 18.6% CP (Exp. 1), and 2,750 kcal per kg ME, 17.1% CP (Exp. 2), to mimic typical commercial broiler diets used in Pakistan. Diets were supplemented with L-lysine HCl to provide total lysine level ranging from 0.85 to 1.10% (six increments) and 0.72 to 1.02% (six increments), respectively in Exp. 1 and 2. Live performance data were subjected to quadratic analysis and requirement was defined as the level achieving 95% of maximum or minimum values. Lysine requirements were found to be 0.98 and 0.97% total lysine, respectively, for gain and feed efficiency during 4-21 days, and 0.87% total lysine for both gain and feed efficiency during 21-40 days of age. Calculated on a digestible lysine basis, the estimates were 0.85 and 0.84%, respectively, for gain and feed efficiency during 4-21 days of age; and 0.75% for gain and feed efficiency during 21-40 days of age.
Keywords
Broilers; Heat-stress; Nutrient-density; Lysine Requirement;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By Web Of Science : 2  (Related Records In Web of Science)
Times Cited By SCOPUS : 3
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