Estimation of methionine requirement of Japanese quails exposed to chronic heat stress during 7 to 21 days of age

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SHIRZADI HASSAN; Zaboli Gholam Reza

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Journal: Journal of Animal Production Year:2020 | Volume:21 | Issue:4 Page(s): 499-509

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Title

Estimation of methionine requirement of Japanese quails exposed to chronic heat stress during 7 to 21 days of age

Author(s)

SHIRZADI HASSAN | Zaboli Gholam Reza | Issue Writer Certificate

Keywords

Amino acidQ2

breast meat yieldQ1

broken-line modelingQ1

feed conversion ratioQ1

requirementQ2

Abstract

The aim of this research is to estimate the methionine requirement of Japanese quails (Coturnix coturnix japonica) from 7 to 21 d of age using linear and quadratic broken-line regressions under chronic heat stress. A total of 480 quails were distributed according to a completely randomized design in 6 experimental treatments (diets containing 0. 40, 0. 45, 0. 50, 0. 55, 0. 60 and 0. 65% of methionine), with 4 replicates of 20 birds each. The basal diet was based on the corn-soybean meal and was formulated in mash form. Supplemental DL-methionine was added to the basal diet at the expense of corn starch to create experimental diets. The birds were fed a standard diet up to d 7, and then were weighed and randomly allotted to the experimental treatments. Birds exposed to chronic heat stress from 8 d of age for 6 h daily (37 ± 0. 8° C from 10 AM to 16 AM). The optimal amounts of methionine for body weight gain, feed conversion ratio, and breast meat yield were obtained with 0. 55, 0. 57, and 0. 60% of the diet as estimated by linear broken-line regression. However, based on the quadratic broken-line regression, the corresponding values were estimated at 0. 58, 0. 59, and 0. 62% of the diet, respectively. According to the findings of this study, It seems that amounts of methionine higher than the usual recommendations are needed for Japanese quails to achieve optimal performance under chronic heat stress.

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APA: Copy

SHIRZADI, HASSAN, & Zaboli, Gholam Reza. (2020). Estimation of methionine requirement of Japanese quails exposed to chronic heat stress during 7 to 21 days of age. JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE), 21(4 ), 499-509. SID. https://sid.ir/paper/386359/en

Vancouver: Copy

SHIRZADI HASSAN, Zaboli Gholam Reza. Estimation of methionine requirement of Japanese quails exposed to chronic heat stress during 7 to 21 days of age. JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE)[Internet]. 2020;21(4 ):499-509. Available from: https://sid.ir/paper/386359/en

IEEE: Copy

HASSAN SHIRZADI, and Gholam Reza Zaboli, “Estimation of methionine requirement of Japanese quails exposed to chronic heat stress during 7 to 21 days of age,” JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE), vol. 21, no. 4 , pp. 499–509, 2020, [Online]. Available: https://sid.ir/paper/386359/en

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