نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار،بخش علوم دامی ، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان چهارمحال و بختیاری، شهرکرد، ایران.
2 مربی،بخش علوم دامی ، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان چهارمحال و بختیاری، شهرکرد، ایران.
چکیده
هدف از این آزمایش بررسی مقایسه ای عملکرد پروار و خصوصیات کمی لاشه بره های لری بختیاری و آمیخته های رومانفΧلری بختیاری بود. به همین منظور از 44 راس بره لری بختیاری 100 روزه و 44 راس بره آمیخته رومانف با لری بختیاری 100 روزه در قالب طرح کاملا تصادفی به روش فاکتوریل 2Χ2Χ2 با دو گروه ژنتیکی(لری بختیاری و آمیخته رومانفΧلری بختیاری)جنس (نر و ماده) و سال (1395 و 1396) استفاده شد. افزایش وزن روزانه، جیره های مورد مصرف،، ضریب تبدیل خوراک و نیز ویژگی های کمی لاشه دام ها اندازه گیری شد. نتایج نشان داد که میانگین افزایش وزن روزانه قبل از شیرگیری و نیز وزن در سن 100 روزگی (پایان شیرگیری) در بره های آمیخته رومانفΧلری بختیاری بیشتر از بره های لری بختیاری بود(p <0/05). اما میانگین افزایش وزن روزانه طی دوره پروار، وزن دوره پروار، مصرف خوراک، وزن لاشه و درصد دنبه بره های لری بختیاری بیشتر از آمیخته های رومانفΧلری بختیاری بود(p <0/05). بره های نر ، میانگین افزایش وزن روزانه دوره پروار بیشتر و ضریب تبدیل کمتری نسبت به بره های ماده داشتند(p <0/05). درصد دنبه و چربی لاشه بره های نربیشتز از ماده ها بود(p <0/05). نتایج این مطالعه نشان داد که عملکرد قبل از شیرگیری بره های آمیخته از بره های لری بختیاری بهتر ولی عملکرد دوره پروار آن ها کمتر است. لذا به نظر می رسد پروار بره های لری بختیاری مناسب تر از آمیخته ها در استان چهارمحال و بختیاری باشد.
کلیدواژه‌ها
عنوان مقاله [English]
Comparison of feedlot performance and carcass characteristics of Lori-Bakhtiari and Romanov×Lori-Bakhtiari crossbreed lambs
نویسندگان [English]
- Morteza karami 1
- Mohsen Bagheri 2
1 Head of Animal science department,, AREEO, Ch&amp;B province
2 Department of Animal Science ,AREEO, Ch & B, Province
چکیده [English]
The aim of this experiment was to compare the feedlot performance and carcass characteristics of Lori-Bakhtiari and Romanov×Lori-Bakhtiari crossbreed lambs. Forty-four Lori-Bakhtiari lamb and Forty-four Romanov×Lori-Bakhtiari lambs were used in a completely randomized design and using a factorial method (2×2) during two consecutive years. The average daily gain and daily feed intake were determined by individual weaning of each animal and then feed conversion ratio was calculated. Carcass characteristics of lambs were measured. The results showed that average daily gain during fattening period (212.1vs. 179.6 g), final fattening weight (52.12 vs. 48.26 kg), feed intake, carcass weight and fat tail percentage in Lori Bakhtiari lambs were greater than Romanov× Lori Bakhtiari crossbred lambs. The average daily gain before weaning (298.4 vs. 266.8 g), the average daily gain during fattening period (217.2 vs. 161.9 g), and feed conversion ratio (7.62 vs. 9.75) in male lambs was better than female lambs (p < 0.05). Fat tail percentage and total carcass fat content in male lambs were higher than that of female lambs (p < 0.05). It is concluded that, Romanov×Lori Bakhtiari crossbred lambs had higher performance than Lori Bakhtiari lambs before weaning. However, fattening period performance and carcass weight in Bakhtiari lambs were higher compared to Romanov×Lori Bakhtiari crossbred lambs. In addition, energy spent per kg of carcass and live weights in Bakhtiari lambs was lower than Romanov×Lori Bakhtiari crossbreds. Therefore, it can be concluded that the indigenous Bakhtiari sheep breed is more useful for fattening than that of Romanov×Lori Bakhtiari crossbreds in Chaharmahal and Bakhtiari province.
کلیدواژه‌ها [English]
- Carcass characteristics
- Feedlot
- Genotype
- Sex
- Sheep Growth performance
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