Abstract
This research was conducted to study the efficacy of different growth promoter’s on the productive performance and carcass yield of broiler chickens. 840 male ROSS and 308 hybrid chickens were used according to completely randomize the design in six treatments and one control (Five growth promoters and control). Thus, there were six groups of chickens: group 1; control diet (without any promoter’s), group 2; control diet + antibiotic, group 3; control diet + probiotic, group 4; control diet + prebiotic, group 5; control diet + phytobiotic and group 6; control diet + symbiotic. The productive indicators evaluated were: feed intake, weight gain, feed conversion ratio (FCR). The carcass yield and the main portions (breast, thigh and abdominal fat) was also determined. In all current studies, there wasn’t any significant difference between treatments in body weight gain (P > 0.05) but all of them had beneficial effect compared to control. Lowest feed conversion ratio was observed in probiotic group and caused more efficient feed intake. Treatments vs. control increased carcass yield significantly but the difference between treatments was not significant. Breast and thigh was not affected by treatments and there wasn’t any significant difference between treatments and control group. Lowest abdominal fat were seen in antibiotic group. According to our results, probiotic and symbiotic appeared to be superior compared to other growth promoters. Key words: Growth promoters, performance, carcass, broiler.
Highlights
Nutrition is the most expensive factor in poultry production; to reduce the cost of raising, one should improve the feed efficiency
Prebiotic have benefits in comparism with probiotics, because they stimulate the growth of bacteria that are present in the intestinal flora naturally, they are naturally adaptive to the intestinal environment (Snel et al, 2002)
The results of this study showed that the use of probiotics causes more weight gain and feed conversion
Summary
Nutrition is the most expensive factor in poultry production; to reduce the cost of raising, one should improve the feed efficiency. Probiotics are live microbial compound that stimulates the growth of beneficial microorganisms and have very positive impact on the health of the host animal These materials are totally against antibiotics (Modir et al, 2001). Sirvydis et al, (2003) reported that food containing phytobiotics have important influences on the development of physiological processes This material increases the metabolism of proteins, fats and carbohydrates and improves growth rate of broiler chickens, average daily gain, final body weight and feed conversion ratio improves. This experiment was designed to compare the effects of growth promoting additives such as; Avilamycin, Gallipro, immunoval, Digestarom and mixed Gallipro and immunoval on performance and carcass characteristics of male Ross 308 broilers
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