نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری، گروه علوم دامی، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران.
2 دانشیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران.
چکیده
به‌منظور بررسی پاسخ جوجه‌های گوشتی به سطوح مختلف پروتئین ایدهآل جیره (توصیه سویه راس 308 و 10 درصد کم‌تر) و نسبت‌های والین به لیزین قابل‌هضم (71، 74، 77، 80 و 83 درصد) در دوره آغازین (یک تا 10 روزگی)، پژوهشی با استفاده از 500 قطعه جوجه گوشتی نر یکروزه در قالب آرایش فاکتوریل 5×2 با طرح کاملاً تصادفی که شامل 10 تیمار و پنج تکرار، انجام شد. نتایج نشان دادند کاهش سطح پروتئین ایدهآل جیره سبب افزایش وزن بدن، مصرف خوراک و بهبود ضریب تبدیل غذایی شد (0/01>P). درصد خاکستر و کلسیم استخوان نیز با کاهش پروتئین ایدهآل جیره به‌طور معنیداری افزایش یافت (0/05>P). کاهش سطح پروتئین ایدهآل جیره سبب کاهش غلظت کلسترول، گلوکز، پروتئین کل، آلبومین، گلوبولین و کلسیم سرم خون شد (0/05>P). بیش‌ترین میانگین وزن بدن در سن 10 روزگی، افزایش وزن، درصد لاشه و سینه و کم‌ترین ضریب تبدیل خوراک در نسبت 74 درصد والین به لیزین قابل‌هضم مشاهده شد (0/05>P). درحالیکه، بیش‌ترین میانگین مصرف خوراک، درصد رانها و درصد خاکستر و کلسیم استخوان در نسبت 77 درصد والین به لیزین قابل‌هضم به‌دست آمد (0/05>P). اثر متقابل معنیداری بین دو فاکتور آزمایشی به‌غیر از صفات درصد لاشه و غلظت فسفر سرم خون مشاهده نشد (0/05>P). در مجموع براساس نتایج این پژوهش، کاهش 10 درصدی سطح پروتئین ایدهآل جیره با حفظ نسبت‌های ایدهآل اسیدهای آمینه ضروری، امکان‌پذیر است. نسبت مناسب والین به لیزین قابل‌هضم براساس شاخص‌های عملکرد و صفات لاشه، 74 درصد و براساس صفات استخوان، 77 درصد پیشنهاد میشود.
کلیدواژه‌ها
عنوان مقاله [English]
Response of broiler chicks to different levels of dietary ideal protein and digestible valine to lysine ratios in the starter period
نویسندگان [English]
- Reza Salahi Moghaddam 1
- Mohammad Hossein Shahir 2
1 Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran.
2 Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
چکیده [English]
In order to evaluate the response of broiler chicks to different levels of dietary ideal protein (Ross 308 strain recommendation and 10% less) and digestible valine to lysine ratio (71, 74, 77, 80, and 83%) in the starter period (one to 10 days of age), a study was performed using 500-day-old male broilers in a 2×5 factorial arrangements based on a completely randomized design including 10 treatments and 5 replications. The results showed that reducing dietary ideal protein level increased body weight, feed intake and improved feed conversion ratio (P<0.01). The percentage of bone ash and calcium content also increased significantly with decreasing dietary ideal protein (P <0.05). The reduction of the dietary ideal protein level decreased the concentrations of serum cholesterol, glucose, total protein, albumin, globulin, calcium, and phosphorus (P<0.05). The highest average body weight at 10 day of age, weight gain, carcass and breast percentages and the lowest feed conversion ratio were observed at 74% of digestible valine to lysine ratio (P<0.05); while the highest average feed intake, thigh percentage, bone ash and calcium percentage were obtained at 77% of digestible valine to lysine ratio (P<0.05). No significant interaction was observed between the two experimental factors except for the carcass percentage traits (P<0.05) and serum phosphorus concentration (P<0.01). In conclusion, based on the results of this study, a 10% reduction in dietary ideal protein levels is possible by maintaining ideal ratios of essential amino acids. The proper ratio of digestible valine to lysine is recommended to be 74% based on performance indices and carcass traits, and 77% based on bone traits.
کلیدواژه‌ها [English]
- Branched-chain amino acid
- Broiler
- Ideal ratio
- Low protein diet
- Valine
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