Effect of acid binding capacity (ABC) and dietary protein level on growth performance and nutrients digestibility of broiler chickens.

Zahra, Kiumarsy and Shakouri, Mir Daryoush (2017) Effect of acid binding capacity (ABC) and dietary protein level on growth performance and nutrients digestibility of broiler chickens. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

In order to evaluate the effect of different levels of dietary crude protein (CP) and acid binding capacity (ABC) on growth performance, ileal nutrients digestibility and blood parameters, an experiment was concucted using 256 day-old mixed sex Ross 308 broiler ckikens. The chicks were allocated into 4 treatments with 4 replicate and 16 birds each by employing a completing randomized desing with 2×2 factorial arrangment. The first factor was dietary CP at two levels of recommended and 10 percent lower and the second factor was at two levels of basal diet and lower than it. Throughout the 42 days period, decreased dietary CP had no significant effect on feed intake, weight gain and feed conversion rate of chickens (P>0.05). The decrease in dietary ABC with no effect on feed intake and feed conversion rate increased weight gain of broilers (P<0.05). There were no significan intraction between dietary CP and ABC on feed intake and feed conversion rate, but the decrease in dietary ABC in low CP diet improved weight gain of chickens (P<0.05). The decreas in dietary CP resulted in decreased and the decrease in dietary ABC resulted in increased gizzard pH (P<0.05). pH value of gizzard increased with lower ABC in low CP diet and declined with lower ABC in recommended CP diet (P<0.05). Decrease in diet CP increased the ileal digestibilty of dry matter and fat (P<0.05). The Decrease in diet ABC also increased the ileal digestibilty of dry matter and protein (P<0.05). There were no significan intraction between dietary CP and ABC on ileal nutrients digestibility (P>0.05). Relative weights of abdominal fat and proventriculus were significantely increased with decreased dietary CP (P<0.05). The decrease in dietary CP significantely depressed total and LDL cholesterol levels and increased the ratio of HDL cholesterol to LDL cholesterol (P<0.05). The lower level of ABC resulted in increased LDL cholesterol level and decreased the ratio of HDL cholesterol to LDL cholesterol (P<0.05). The ratio of HDL cholesterol to LDL cholesterol was also increased by increasing ABC in low CP diet (P<0.05). The results of this study showed that by decreasing ABC of low CP diet can improve growth performance of broiler chickens.

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