effect of different levels of protein and probiotic on performance and immune response in broiler chicks under heat stress
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abstract
this study was carried out to determine the effects of different levels of protein and probiotic (protexin) on performance, and immune response in ross (308) broiler exposed to heat stress. five hundred and forty one-day old broilers were employed in a compeletly randomized design (3×3 factorial arrangement) of 3 replicates for each treatment. the diets were formulated according to nrc (1994) recommendation with protein levels (90, 100 and 110% of nrc recommendations) along with probiotic (0, 200 and 400 ppm, containing 2×109 cfu/g of spores). the birds were exposed to heat stress (34±3?c) for 8 hours/day (10:00 to 18:00). the results indicated that, the body weight gain in broilers fed nrc plus %110 nrc protein was significantly higher than that in those fed %90 nrc protein (p
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Journal title:
علوم دامی ایرانجلد ۴۲، شماره ۲، صفحات ۹۵-۱۰۶
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