تأثیر سطوح جیره‎ای عصاره خارمریم بر فراسنجه‏های سرم و کیفیت تخم‎ در مرغ‎های تخم‎گذار تحت تنش القاء شده با تزریق دگزامتازون

نوع مقاله : مقاله کامل

نویسندگان

1 دانش‏آموخته کارشناسی ارشد علوم دامی، دانشگاه لرستان

2 استادیار گروه علوم دامی، دانشگاه لرستان

3 استاد گروه علوم دامی، دانشگاه لرستان

چکیده

به منظور بررسی اثر عصاره خارمریم و تزریق دگزامتازون بر عملکرد تولیدی، فراسنجه‎های سرم، و کیفیت تخم در مرغ‎های تخمگذار، تعداد 72 قطعه مرغ تخمگذار سویه های‎لاین (36W) با سن 75 هفته مورد استفاده قرار گرفت. آزمایش به صورت فاکتوریل 2×3 برای بررسی اثرات شش تیمار متشکل از سه سطح عصاره خارمریم (صفر، 100 و mg/kg 200) و دو سطح تزریق دگزامتازون (صفر و چهار میلی‎گرم) در چهار تکرار و سه پرنده در هر تکرار در قالب طرح کامل تصادفی به مدت شش هفته اجرا شد. تزریق دگزامتازون موجب کاهش درصد تولید و تولید توده‎ای تخم‎مرغ در کل دوره آزمایش شد (05/0>P). مرغ‎های تخمگذار تحت تنش با تزریق دگزامتازون ضریب تبدیل خوراک بالاتری در مقایسه با گروه بدون تزریق در کل دوره نشان دادند (05/0>P). شمارش لنفوسیت در خون مرغ‎های تغذیه شده با mg 200 عصاره خارمریم بیشتر از سایر پرندگان بود (05/0>P). غلظت لیپوپروتئین‎های با چگالی بالا در سرم پرندگان تغذیه شده با mg 200 عصاره خارمریم بالاتر از سایر گروه‎ها بود (05/0>P). افزودن عصاره خارمریم به جیره مرغ‏های تخمگذار سبب کاهش غلظت لیپوپروتئین‎های با چگالی پایین سرم شد (05/0>P). نتیجه‎گیری شد که القاء تنش با تزریق دگزامتازون سبب کاهش شاخص‎های تولید و افزایش ضریب تبدیل غذایی شد و افزودن عصاره خارمریم به جیره غذایی تأثیری در تعدیل اثرات منفی تنش بر عملکرد مرغ‎های تخمگذار نداشت.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of dietary levels of milk thistle extract (Silybum marianum) on serum parameters and egg quality in laying hens imposed to dexamethasone-induced stress

نویسندگان [English]

  • M. Khosravi 1
  • B., Parizadian Kavan 2
  • H. Khosravinia 3
1 MSc Student, Department of Animal Science, Lorestan University, Khorramabad, Iran
2 Assistant Professor, Department of Animal Science, Lorestan University, Khorramabad, Iran
3 Professor, Department of Animal Science, Lorestan University, Khorramabad, Iran
چکیده [English]

The aim of the current study was to determine the effects of different levels of milk thistle extract on productive performance, blood parameters and egg quality in laying hens imposed to dexamethasone-induced stress. The 2×3 factorial experiment was managed in a completely randomized design with 72 Hy- Line (W36) laying hens in 6 treatments and 4 replicates of 3 birds each. The experiment was carried out from the age of 75 to 81 weeks. Hens were weighed and either remained uninjected or received injections dexamethasone (0 and 4 mg per bird). The milk thistle extract were included at 0, 100 and 200 mg/kg in diets. The dexamethasone injections caused reductions in egg production percentage and egg mass in the throughout the experimental period (P<0.05). Laying hens imposed to dexamethasone-induced stress had the highest feed conversion ratio (P<0.05). The highest amount of lymphocytes in blood were observed in groups supplemented with 200 mg/kg of milk thistle extract (P<0.05). HDL content in serum was increased by the inclusion of milk thistle extract (200 mg/kg) (P<0.05). Adding of milk thistle extract to the diet of laying hens caused a significant decrease in LDL content in serum (P<0.05). In general, stress induced by dexamethasone injection reduced egg production and increased feed conversion ratio and addition of milk thistle extract to the diet had no positive impact on performance in laying hens.

کلیدواژه‌ها [English]

  • Dexamethasone
  • Egg
  • Laying hen
  • Milk thistle
  • Stress
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