برآورد میزان نیاز آهن مرغ‌های مادر گوشتی در اواخر دوره تولید با استفاده از مدل‌های غیرخطی

نویسندگان

گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج– ایران

چکیده

زمینه مطالعه: تاکنون تحقیقی در زمینه نیاز آهن مرغ‌های مادر گوشتی انجام نشده است. هدف:  آزمایش برای تعیین نیاز آهن مرغ مادر گوشتی با استفاده از مدل‌های غیر خطی انجام شد. روش کار: 48 قطعه مرغ مادر گوشتی( سویه کاب 500) به صورت انفرادی در قفس‌های گالوانیزه قرار گرفتند. مرغ‌ها مدت 3 هفته جهت تخلیه ذخایر آهن تغذیه شدند. در 62 هفتگی، مرغ‌ها به صورت تصادفی به 4 تیمار (‌ppm82 ،67،52 ،37 ‌ آهن) با 4 تکرار اختصاص یافتند. وزن بدن، تولید تخم‌مرغ و وزن تخم‌مرغ در طول 6 هفته آزمایش اندازه‌گیری شدند. نتایج: بر اساس نتایج حاصل از مدل‌ خط شکسته میزان نیاز آهن برای صفات سرانه تولید تخم‌مرغ، وزن تخم مرغ، وزن توده تخم‌مرغ، میزان آهن کبد، سرم، مغز استخوان، طحال و تخم مرغ به ترتیب ‌ppm65، 62، 54، 72، 57، 63 و 64 بود. آهن مورد نیاز برآورد شده با استفاده از مدل لوجستیک برای صفات میزان آهن کبد، طحال، سرم خون و مغز استخوان به ترتیب ppm66، 53، 129 و 58 بود. مدل نمایی میزان نیاز آهن را برای صفات وزن تخم‌مرغ، میزان آهن کبد، طحال، سرم خون و مغز استخوان به ترتیب ‌ppm62، 96، 70، 73 و 111 برآورد کرد. بر اساس مدل تابعیت درجه دو نیز میزان نیاز آهن برای صفات سرانه تولید تخم‌مرغ، وزن تخم مرغ، میزان آهن کبد، سرم، مغز استخوان، طحال و تخم مرغ به ترتیب ‌ppm 65،66،71،220،51،70 و 62 بود. در میان 4 مدل مورد استفاده، با توجه به پایین بودن واریانس بین نیازهای برآوردی، مدل خط شکسته برآورد دقیق‌تری از نیاز آهن داشت. نتیجه‌گیری نهایی: نیاز آهن در مرغ‌های مادر گوشتی در اواخر دوره تولید بیش از میزان توصیه شده (راهنمای پرورش کاب 500، ppm 55) است.

کلیدواژه‌ها


عنوان مقاله [English]

Estimation of iron requirement for broiler breeder hens at the late stage of production cycle using nonlinear models

نویسندگان [English]

  • Mahmood Abbasi
  • Mojtaba Zaghari
  • Mahdi Ganjkhanlou
Department of Animal Sciences, College of Agriculture and Natural Resources University of Tehran, Karaj-Iran
چکیده [English]

BACKGROUND: No study has been conducted on iron requirements of broiler breeder hens until now. OBJECTIVES: The purpose of the present study was to determine the iron requirement of broiler breeder hens using nonlinear models. METHODS: Forty eight (Cobb 500) broiler breeder hens were individually placed in galvanized wire cages. In order to depletion of hens iron reserved, hens were offered a semi purified iron deficient diet for 3 weeks. At 62 week of age, Hens  were  randomly  allocated  to  4  dietary  treatments  (37, 52, 67, 82 ppm of diet iron) with 4 replicates. Body weight gain, egg production and egg weight were measured during 6 weeks experimental period. RESULTS: The results showed that the estimated iron requirement for egg production(H.H), egg weight, iron content of the liver, blood serum, bone marrow, spleen and egg yolk were 65, 62, 54, 72, 57, 63, 64 ppm respectively. The logistic model was fitted to iron content of liver, spleen, serum and bone marrow, suggested that iron requirement were equal to 66, 53, 129, 58 ppm respectively. Fitted exponential model estimated iron requirement for egg weight, iron content of liver, spleen, serum and bone marrow were 62, 96, 70, 73, 111 ppm respectively. Also based on the quadratic equation models, estimated iron requirement for egg production(H.H), egg weight, iron content of the liver, blood serum, bone marrow, spleen and egg yolk were 65, 66, 71, 220, 51, 70, 62 ppm respectively. Among the four models used, the broken line model is more accurate in estimating the required iron than other models due to the low variance between estimated requirements. CONCLUSIONS: Results indicated that value recommended by primary breeder (Cobb 500 management guide, 55 ppm) is lower than values obtained in present study.

کلیدواژه‌ها [English]

  • Broiler breeder hens
  • estimate requirement
  • Iron
  • nonlinear models
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