نوع مقاله : مقاله پژوهشی
نویسندگان
گروه علوم دامی، دانشکده علوم دامی و شیلات، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
This research was conducted in order to investigate the effect of peptides extracted from casein on performance, carcass characteristics and antioxidant properties of breast meat on 350 male broiler chicks in a completely randomized design with 7 treatments, 5 replications and 10 birds in each replicate. Treatments included: 1) basic diet without additives (control), 2) basic diet + Avilamycin antibiotic and basic diet + levels of 200 to 1000 mg/kg peptide. The results showed that the use of peptides period had not significant effect on feed intake in any periods of the experiment. Effect of peptides on body weight gain and feed conversion ratio in starter period was not significant. In grower, treatments containing 600, 800 and 1000 and in finisher and whole periods use of 800 and 1000 mg peptides increased body weight gain in compared to control treatment (P<0.05). Adding peptides also improved feed conversion ratio in grower, finisher and whole periods of the experiment. Use of 600, 800 and 1000 mg peptides decreased abdominal fat and increased heart percentage (P<0.05). Small intestine, duodenum, jejunum and ileum percentage in treatments supplemented with peptides significantly reduced (P<0.05). Use of peptides derived from casein improved the antioxidant properties of chicken breast meat (P<0.05). In conclusion, the results of the present study showed that use of peptides derived from casein improved performance, decreased abdominal fat, small intestine percentages and increased breast meat stability in broiler chicks.
کلیدواژهها [English]
Extended Abstract
Introduction
In recent years, attention to use of new feed additives such as, bioactive peptides derived from animal or plant origin in poultry diets to enhance performance and meat stability is increasing. There is not published data about effect of bioactive peptides derived from milk casein on performance and meat stability in broiler chickens. Therefore, the present research aimed to investigate the effect of casein bioactive peptides on performance, carcass characteristics, and breast and thigh meat stability in broiler chickens.
Materials and Methods
In this experiment, the effects of different levels of casein bioactive peptides were investigated on performance, carcass characteristics and meat stability in 350 male broiler chicks, in a completely randomized design with seven treatments, five replicates and 10 chicks in each replicate. The experimental treatments were: basic diet without additives (control), basic diet + Avilamycin antibiotic and basic diet + levels of 200 to 1000 mg casein bioactive peptides in each kg of diet. During the experiments feed intake, body weight gain were measured in starter (1 to 10 days), grower (11 to 24 days), finisher (25 to 42 days) and whole period (1 to 42 days). Feed conversion ratio was calculated by feed intake divided to body weight gain in each period of the experiment. At 42 days of age two birds with body weight close to average body weight in each replicate were slaughtered and carcass, breast, thigh, abdominal fat, liver, heart, gizzard, spleen, bursa of fabricious, intestine weights were measured. Antioxidant activity in breast meat was measured by DDPH and FRAPS methods after 0 and 30 days storage at -18 centigrade degree. Data obtained from this experiment were analyzed as a completely randomized design by GLM procedure of SAS software. Comparison among means were performed by Duncan,s multiple range test at P<0.05.
Results and discussion
The results indicated that, use of different levels of casein bioactive peptides had not significant effect on weight gain and feed conversion ratio in the starter period, but it improved weight gain and feed conversion ratio in grower, finisher and whole periods of the experiment (p<0.05). Effect of casein bioactive peptides was not significant on feed in take in different periods of the experiment. Supplementation of casein peptides had not significant effect on carcass, breast, thigh, liver and spleen percentage. Use of 600, 800 and 1000 mg peptides in each kg of diet, decreased abdominal fat, increased heart and gizzard percentages (P<0.05). Small intestine, duodenum, jejunum and ileum percentages in treatments supplemented with casein peptides significantly reduced (P<0.05). Use of peptides significantly improved the antioxidant properties and stability in breast meat after one month storage at at -18 centigrade degree (P<0.05).
Conclusion
With regards to results of this study, it was concluded that, supplementation of casein bioactive peptides improved performance, breast meat stability and decreased abdominal fat percentage in broiler chickens.
Keywords: Casein bioactive peptides, chicks, performance, meat stability
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