نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه ایلام، ایلام، ایران
2 استادیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه زابل، زابل، ایران
چکیده
این پژوهش به منظور برآورد نیاز بلدرچین ژاپنی (Coturnix coturnix japonica) از هفت تا 21 روزگی به اسید آمینه متیونین با استفاده از رگرسیون خط شکسته خطی و خط شکسته درجه دو تحت شرایط محیطی تنش مزمن گرمایی انجام شد. به همین منظور از تعداد 480 قطعه بلدرچین در قالب طرح کاملاً تصادفی با شش تیمار (جیره‌های حاوی سطوح 0/40، 0/45، 0/50، 0/55، 0/60 و 0/65 درصد متیونین) و چهار تکرار استفاده شد. جیره پایه براساس ذرت-کنجاله سویا بصورت آردی تهیه شد و برای تهیه جیره‌های آزمایشی مکمل دی ال-متیونین جایگزین نشاسته در جیره پایه شد. جوجه‌ها تا سن هفت روزگی با جیره یکسانی پرورش و پس از وزن کشی، به صورت تصادفی بین تیمارها توزیع شدند. پرندگان از 8 روزگی روزانه 6 ساعت (دمای 0/8±37 درجه سلسیوس از ساعت 10 صبح تا 4 عصر) در معرض تنش مزمن گرمایی قرار گرفتند. میزان نیاز متیونین برای افزایش وزن، ضریب تبدیل خوراک و تولید ماهیچه سینه براساس رگرسیون خط شکسته خطی، به ترتیب 0/55، 0/57 و 0/60 درصد جیره و براساس رگرسیون خط شکسته درجه دو به ترتیب 0/58، 0/59 و 0/62 درصد جیره برآورد شد. براساس یافته‌های این تحقیق، جهت دستیابی به عملکرد بهینه بلدرچین‌های ژاپنی تحت شرایط استرس گرمایی مزمن، به نظر می‌رسد میزان نیاز به متیونین بالاتر از توصیه‌های رایج است.
کلیدواژه‌ها
عنوان مقاله [English]
Estimation of methionine requirement of Japanese quails exposed to chronic heat stress during 7 to 21 days of age
نویسندگان [English]
- Hassan Shirzadi 1
- Gholamreza Zaboli 2
1 Department of Animal Science, Faculty of Agriculture, Ilam University, Ilam, Iran
2 Assistant professor in University of Zabol
چکیده [English]
The aim of this research is to estimate the methionine requirement of Japanese quails (Coturnix coturnix japonica) from 7 to 21 d of age using linear and quadratic broken-line regressions under chronic heat stress. A total of 480 quails were distributed according to a completely randomized design in 6 experimental treatments (diets containing 0.40, 0.45, 0.50, 0.55, 0.60 and 0.65% of methionine), with 4 replicates of 20 birds each. The basal diet was based on the corn-soybean meal and was formulated in mash form. Supplemental DL-methionine was added to the basal diet at the expense of corn starch to create experimental diets. The birds were fed a standard diet up to d 7, and then were weighed and randomly allotted to the experimental treatments. Birds exposed to chronic heat stress from 8 d of age for 6 h daily (37 ± 0.8°C from 10 AM to 16 AM). The optimal amounts of methionine for body weight gain, feed conversion ratio, and breast meat yield were obtained with 0.55, 0.57, and 0.60% of the diet as estimated by linear broken-line regression. However, based on the quadratic broken-line regression, the corresponding values were estimated at 0.58, 0.59, and 0.62% of the diet, respectively. According to the findings of this study, It seems that amounts of methionine higher than the usual recommendations are needed for Japanese quails to achieve optimal performance under chronic heat stress.
کلیدواژه‌ها [English]
- Amino acid
- breast meat yield
- broken-line modeling
- feed conversion ratio
- requirement
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