1دانشجوی دکتری، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران
2استاد، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران
3دانشیار، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران
4دانشیار، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه شیراز، شیراز، ایران
5دانشجوی دکتری، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه گرگان، گرگان، ایران
چکیده
هدف از این پژوهش بررسی تأثیر پرکاری درازمدت غدۀ تیروئید بر وزن بدن و تولید تخم‌مرغ بود. همچنین ارتباط بین پرکاری تیروئید و برخی فراسنجه‌های تولید‌مثلی بررسی شد. در این آزمایش 70 قطعه مرغ مادر گوشتی سویۀ کاب 500 در سن 47 هفتگی به شیوۀ تصادفی به دو گروه تیمار (پنج تکرار شامل هفت پرنده) تقسیم شدند. تیروکسین به مدت صد روز متوالی به شیوۀ دهانی به گروه پرکار تجویز شد (3/0 میلی‌گرم به ازای هر پرنده در روز)، وزن بدن و تولید تخم‌مرغ به شیوۀ هفتگی محاسبه شدند. تأثیر پرکاری تیروئید بر غلظت پلاسمایی T4معنی‌دار بود؛ اما غلظت T3تحت تأثیر قرار نگرفت. نتایج نشان دادند، هورمون‌های تیروئیدی تأثیر کاهشی قابل توجهی بر وزن بدن داشتند. هورمون‌های تیروئیدی بر تولید تخم‌مرغ تأثیر نداشتند، اما اثر برهمکنش تیمار و زمان (هفته) بر تولید تخم‌مرغ معنی‌دار بود. وزن تخمدان و اویداکت بین مرغ‌های گروه شاهد و پرکار تفاوت نداشتند. تجویز تیروکسین به مرغ‌های مادر سبب کاهش قطر فولیکول‌های F1شد.
Effects of long-term hyperthyroidism on body weight, egg production and reproductive traits in breeder hens
نویسندگان [English]
Fatemeh Saemi1؛ Ahmad Zareh Shahneh2؛ Mahdi Zhandi3؛ Amir Akhlaghi4؛ Sharif Rostami5
1Ph.D. Candidate, Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
2Professor, Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
3Associate Professor, Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
4Associate professor, Department of Animal Science, College of Agriculture, Shiraz University, Shiraz, Iran
5Ph.D. Candidate, Department of Animal Science, University College of Agriculture and Natural Resources, University of Gorgan, Gorgan, Iran
چکیده [English]
The aim of this experiment was to study the effects of long-term induced hyperthyroidism on the body weight and egg production. In addition the relationships between hyperthyroidism and some reproductive parameters were studied. A total of seventy 47-week-old Cobb 500 breeder hens were randomly allotted to two treatment groups (5 replicates of 7 hens each). Thyroxine was orally administered to the hyperthyroid group (0.3 mg/bird/day) for 100 consecutive days during which the body weight and egg production were recorded on a weekly basis. Effect of hyperthyroidism on plasma T4 levels was significant; but, the T3 level was not affected. Results indicated a significant decreasing effect of thyroid hormones on body weight. Thyroid hormones had no effect on egg production; however, the treatment × time (wk) interaction effect was significant on egg production. Ovarian and oviductal weight were not different between the control and hyperthyroid hens. Administration of thyroxine to breeder hens decreased the diameter of F1 follicles.
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