The Effect of in ovo Injection of Aromatase Inhibitors on the Performance of Broilers
محورهای موضوعی : Camel
ت. مکرمی
1
(
Department of Animal Science, University of Mohaghegh Ardabili, Ardabil, Iran
)
ب. نویدشاد
2
(
Department of Animal Science, University of Mohaghegh Ardabili, Ardabil, Iran
)
ن. هدایت ایوریق
3
(
Department of Animal Science, University of Mohaghegh Ardabili, Ardabil, Iran
)
ف. میرزائی آقجه قشلاق
4
(
Department of Animal Science, University of Mohaghegh Ardabili, Ardabil, Iran
)
کلید واژه: broiler chickens, Aromatase inhibitors, fadrozole hydrochloride, mushroom extract, nettle extract, sexual differentiation,
چکیده مقاله :
Change in sex ratios for broiler chickens, has many economic benefits of the poultry industry. The gonads in chick embryo at an early stage have the potential to convert to both sexes (male and female). Sexual differentiation is due to aromatase expression in the left gonad in 5-6 days of the embryonic period and the production of estrogen from testosterone. Administration of aromatase inhibitors prevents the synthesis of estrogen in genetically female birds and produce males with female genotype. In this study, the effects of in ovo injection of 0.1 mg mushroom extract, nettle extract and fadrozole hydrochloride as aromatase inhibitors on the fifth day of incubation period on hatchability, embryo mortality and performance of hatching chicks were examined. The results of this experiment showed that there were no significant differences in hatchability, embryo mortality during incubation and the weight of hatching chicks. Daily feed intake and body weight gain in chickens hatched from mushroom extract and fadrozole hydrochloride groups were higher than the two other groups (p <0.05). Also, in ovo injection of a mushroom extract, nettle extract or fadrozole hydrochloride had no effect on the dressing percentage and internal organ weights.
تغییر نسبتهای جنسی جوجه های گوشتی دارای مزایای اقتصادی زیادی در صنعت طیور است. گنادها در جنین جوجه در مراحل اولیه قابلیت تبدیل به هر دو جنس (نر و ماده) را دار هستند. تمایز جنسی به دلیل بیان آروماتاز در گناد چپ در روزهای 6-5 دوره جنینی و تولید استروژن از تستسترون انجام میگیرد. مصرف مهارکننده های آروماتاز مانع سنتز استروژن در پرنده های ماده با ژنوتیپ ماده و تولید نرهایی با ژنوتیپ ماده می شود. در این مطالعه، اثر تزریق درون تخم مرغی 0.1 میلیگرم عصاره قارچ خوراکی، عصاره گزنه و فدرازول هیدروکلراید به عنوان مهارکننده آروماتاز در روز پنجم دوره جوجه‌کشی بر قابلیت جوجهدرآوری، تلفات جنینی و بازدهی تولیدی جوجههای تفریخ شده مورد بررسی قرار گرفت. نتایج این آزمایش نشان داد که هیچ تفاوت معنی‌داری در قابلیت جوجهدرآوری، تلفات جنینی طی دوره جوجه‌کشی و وزن جوجههای تفریخ شده وجود نداشت. مصرف خوراک و افزایش وزن روزانه در جوجههای تفریخ شده از گروه‌های تزریق شده با عصاره قارچ و فدرازول هیدروکلراید بالاتر از دو گروه دیگر بود (0.05>P). همچنین، تزریق درون تخم مرغی عصاره قارچ، عصاره گزنه یا فدرازول هیدروکلرابد اثری بر درصد لاشه و اندام‌های داخلی ایجاد ننمود.
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