Effects of Gender and Dietary Ionophores on Growth Performance and Carcass Characteristics in Moghani Lambs
محورهای موضوعی : Camelس. صادقی 1 , س.ع. رافت 2 , ج. شجاع 3 , ح. امانلو 4
1 - Young Researchers and Elite Club, Tabriz Branch, Islamic Azad University, Tabriz, Iran
2 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
3 - Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
4 - Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
کلید واژه: growth performance, carcass characteristics, Moghani sheep, fat-tail, internal fat,
چکیده مقاله :
An experiment was carried to evaluate the effects of gender and two dietary ionophores on growth performance and slaughter characteristics in Moghani sheep. A total of 30 Moghani lambs (15 males and 15 females) were distributed randomly into 30 individual cages. Each gender group consisted of 5 animals and fed with a basal diet with no supplement, the same basal diet plus 25 mg/kg monensin (MON) or 25 mg/kg lasalocid (LAS). The lambs were weighed and slaughtered after a feeding period of 134 days and carcass parameters were determined. Average slaughter weight (SW) was significantly influenced by gender (48.9 kg for females vs. 51.4 kg for males) (P<0.01) but not by diet type. Neither gender nor ionophore supplementations affect average daily gain (ADG) (P>0.05). Lambs fed MON had the lowest feed intake (FI) and feed conversion ratio (FCR) which significantly differed from those of the lambs fed the other two diets. Females had a significantly higher average internal fat compared with their male counterparts (P<0.01). In regard to fat-tail weight, significant decreasing was observed in ionophore groups as compared to control group (P<0.05). Males exhibited higher growth performance with heavier offals and carcass cuts including valuable cuts than in females. Dietary MON could be used as a potent feed additive improving feed efficiency and reducing internal fat and offals proportions in Moghani lambs.
آزمایشی به منظور بررسی اثر جنس و دو نوع جیره غذایی حاوی یونیفرم بر عملکرد رشد و خصوصیات لاشه در گوسفندان مغانی انجام گرفت. 30 رأس بره مغانی (15 نر و 15 ماده) به طور تصادفی در 30 قفس انفرادی توزیع شدند. گروه جنسی شامل 5 رأس حیوان و با سه جیره غذایی شامل جیره پایه بدون مکمل، جیره پایه بعلاوه 25 میلیگرم در کیلوگرم موننسین و جیره پایه بعلاوه 25 گرم در کیلوگرم لاسالوسید تغذیه شدند. برهها بعد از یک دوره پروار 134 روزه توزین و برای تعیین خصوصیات لاشه مورد کشتار قرار گرفتند. میانگین وزن لاشه به طور معنیداری متأثر از جنس بود (01/0>P)، اما تحت تأثیر نوع جیره غذایی قرار نگرفت. جنس حیوان و نوع جیره غذایی اثر معنیداری بر میانگین وزن روزانه حیوان نداشت(05/0<P). برههای تغذیه شده با جیره حاوی موننسین دارای کمترین مصرف خوراک و ضریب تبدیل غذایی بوده و تفاوت معنیداری با برههای تغذیه شده با سایر گروههای غذایی داشتند. میانگین چربی داخلی در برههای ماده به طور معنیداری بیشتر از برههای نر بود (01/0>P). وزن دنبه کاهش معنیداری در گروههای مصرف کننده یونیفرها نسبت به گروه شاهد داشت (05/0>P). نرها نسبت به مادهها عملکرد رشد بالاتری به علت وجود احشاء داخلی سنگینتر و قطعات لاشه با ارزش بالا داشتند. جیره حاوی موننسین میتواند به عنوان یک افزودنی غذایی مفید برای بهبود بازده غذایی و کاهش چربی داخلی و اجزای زاید لاشه مورد استفاده قرار گیرد.
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