Effects of dietary fiber and threonine on performance,intestinal morphology and immune responses in broiler chickens |
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| Institution: | 1. Department of Animal Science, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, 81595-158, Iran;2. Animal Science Research Department, Isfahan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education & Extension Organization (AREEO), Isfahan, 81785-199, Iran |
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| Abstract: | The present experiment was conducted to investigate the effects of fiber and threonine (Thr) on growth performance, intestinal morphology and immune responses of broiler chickens. A total of 420 one-day-old mixed sex broiler chicks (Ross 308) were randomly divided into 6 experimental diets and 5 replicates of 14 chicks based on a factorial arrangement (2 × 3) from 1 to 42 d of age. Experimental factors included dietary supplemental fiber type (no supplemental fiber NSF], 30 g/kg sugar beet pulp SBP] or 30 g/kg rice hull RH]) and Thr inclusion level (100% or 110% of Thr requirement recommended by breeder company Ross 308]). Growth performance of broilers was assayed at different periods of the experiment. Intestinal morphometric features were measured at 21 d of age. Antibody titer against sheep red blood cells (SRBC), Newcastle and influenza disease viruses were measured on d 30 of trial. Dietary inclusion of SBP and RH significantly decreased feed intake and weight gain during the entire rearing period (P < 0.05). Interaction of fiber and Thr had no beneficial effects on the performance of chickens across the entire rearing phase. Dietary supplementation of 110% Thr required level improved jejunal morphometric features (P < 0.05), whereas its inclusion with fibrous materials failed to show the same effects. Dietary supplemental Thr together with SBP significantly increased antibody production against SRBC (P < 0.05). In conclusion, although supplemental 30 g/kg fibrous materials impaired growth performance, inclusion of SBP along with 110% Thr level improved the humoral immunity in broiler chickens. |
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| Keywords: | Broiler chickens Fiber Threonine Weight gain Antibody titer |
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