Nonruminant Nutrition: Management
نویسندگان
چکیده
Cobb male broilers (28 d of age) previously fed same starter diet were offered a single diet (control) and isoproteic choices between 2.950 and 3.250 kcal/g diets from 29 to 50 d. The control and dietary energy choices were fed to broilers housed in one of 2 ambient temperatures: 21 ± 1°C (normal temperature) and 30 ± 0.6°C (heat stress). Broilers housed at 21°C fed isoproteic choices varying in ME content had similar BW gain, feed intake (FI), feed conversion, ME intake and energy conversion as did birds fed the control diet. Broilers housed at 30°C fed the isoproteic choices varying in ME content had better BW gain, feed conversion and energy conversion compared with broilers fed the control diet. There was a marked preference (78.9% of FI) for the high energy diet (3.250 kcal/g) over the low energy diet (2.950 kcal/g) for broilers housed at 21°C, but this preference was less accentuated for broilers housed at 30°C (65.2% of FI). A potential explanation for broilers selecting diets with less ME in heat stress conditions compared with diet selection for broilers housed at 21°C may be related to the broiler trying to reduce gastrointestinal energy cost especially if hot ambient temperatures decrease fat and protein digestion as suggested by previous research. These data indicate that broilers in heat stress prefer reduced ME diets compared with broilers housed at 21°C.
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