بررسي صفات رشد و لاشه بره هاي حاصل از تلاقي نژاد زندي بازل

Comparison growth and carcass traits of crossbred lambs from Zandi breed with Zel ram

To reduce the carcass fat through crossbreeding, the ewes of Zandi (Z) breeds (fat tailed) mated with Zel (ZL) rams as a tailed breed. The pure and crossbred lambs were fattened for 114 days and 24 lambs slaughtered for measurement of carcass traits. Finish weight and average daily gain during fattening of zel lambs were higher than zandi Iambs and Fcr of zel lambs were lower than zandi lambs but these difference were not significance (p>0.05).The percentage of lean meat and bone of zel* zandi lambs were higher than zandi lambs. The difference of bone percentage was significant (p<0.05). The percentage of subcutaneous, intermuscular and visceral fat of zandi lambs were lower and fat-tail was higher than zel* zandi lambs (p<0.001). The percentage of carcass fat (i.e subcutaneous, intermuscular and fat-tail) and ether extract in zel* zandi lambs were 33.0, 35.1 and in zandi lambs were 37.0 and 38.7 respectively (p<0.05). The percentage of total fat (carcass plus visceral fat) in crossbred zel*zandi and zandi lambs were 48.1 and 46.3 respectively (p>0.05).