Abstract
Two experiments were conducted to determine the M+C requirement of straight-run broiler chickens (Hubbard x Hubbard) during the period 4–21 (Exp. 1) and 21–40 (Exp. 2) days of age. Experiments were conducted during summer months (July–August) in open-sided houses, thus exposing chicks to chronic heat stress. Daily min-max temperature averaged 26–37C (Exp. 1) and 23–36C (Exp. 2). M+C deficient basal diets were formulated to contain low-nutrient-density, i.e., 2750 kcal per kg ME, 20.1% CP (Exp. 1), and 2780 kcal per kg ME, 17.0% CP (Exp. 2). Diets were supplemented with DL-methionine to provide total M+C level ranging from 0.64 to 0.89 % (six increments) and 0.54 to 0.79% (six increments), respectively in experiment 1 and 2. Requirements (0.95 of the maximum quadratic response) were found to be 0.77 and 0.75% total M+C, respectively for gain and feed efficiency, during 4–21 days; and 0.67% total M+C for both gain and feed efficiency during 21–40 days of age. Calculated on the digestible M+C basis, the estimates were 0.67 and 0.65% respectively for gain and feed efficiency during 4–21 days of age; and 0.60% for gain and feed efficiency during 21–40 days of age.
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Abbreviations
- C:
-
Celsius
- FCR:
-
Feed Conversion Ratio
- Kcal:
-
kilo calories
- M+C:
-
Methionine + Cystine
- ME:
-
Metabolizable Energy
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Aftab, U., Ashraf, M. Methionine+cystine requirement of broiler chickens fed low-density diets under tropical conditions. Trop Anim Health Prod 41, 363–369 (2009). https://doi.org/10.1007/s11250-008-9197-3
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DOI: https://doi.org/10.1007/s11250-008-9197-3