Fattening lambs with small fat tail dimensions and comparing them with larger fat tail on the growth performance and carcass traits of lambs of Lori sheep breeds
Behrouz Yarahmadi
1
(
Assistant Professor, Department of Animal Sciences, Lorestan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Iran
)
Mohsen Mohamadi saei
2
(
Animal Science Research Department, Lorestan Agricultural and Natural Resources Research and Education Center, AREEO, Khorramabad, Iran
)
Mirhassan Beiranvand
3
(
عضو هیأت علمی مرکز تحقیقات کشاورزی لرستان
)
amin kazemi zadeh
4
(
Ph.D. Candidate, Department of Animal Science, Faculty of Animal Science and Food Technology, Khuzestan Agricultural Sciences and Natural Resources University, Khuzestan
)
Keywords: Fattening characteristics, Carcass traits, Feed conversion ratio, Lori lambs, Small fat-tail ,
Abstract :
This study was conducted with the aim of fattening lambs with small fat-tail compared to lambs with large fat-tail on growth performance and carcass traits of lambs of the Lori breed. 30 male lambs were selected based on the size of the tail. The lambs weighing about 30 kg and three months old of weaning were selected and divided into two groups of 15. The experimental group lambs included whose fat-tail width was between 15.5-19.5 cm and fat-tail length 17-22 cm, and the control group included whose fat-tail width was more than 19.5 cm and fat-tail length was 22 cm. At the period end ADG, FI, and FCRwere measured. At the end of the fattening of 90 days, 8 heads from each group of small tail and large fat-tail were slaughtered. The lambs were compared with the independent t-test.The highest ADG in lambs with small fat-tail was compared to larger fat-tail (210 vs.182gr/d).The FCR was better in lambs with small fat-tail compared to larger fat-tail (7.21 vs. 8.35). The highest carcass efficiency percentage and lean meat percentage were small fat-tail lambs. In terms of total carcass fat, there was a significant difference between the two groups and small tail lambs had the lowest( 17.29 vs. 23.63%). There was significant difference between small tail lambs and control lambs in terms of lean meat percentage (P<0.05). The results showed that the price of each kilogram of weight gain for lambs with small tails was 13.65% cheaper than larger fat tails. Overall, lambs with small fat-tail size are recommended for fattening due to the suitable FCR, higher ADG and more suitable carcass traits along with the cost weight gain and lower carcass.
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