Effect of fattening period and fat-tail size on growth and carcass characteristics of male Lori lambs

In order to determine fattening period and fat-tail size on growth and carcass characteristics of male Lori sheep, this experiment was carried out. This trail was conducted by factorial experiment basis on block completely design (BCRD) as well covariance analysis for three fat-tail size (small, medium, large) and three fattening period (90, 120 and 150 days). Eighty seven lambs were selected with average 30±2.5kg body weight base on fat-tail situation from province overall. In early experiment, six Lamb were slaughtered. At the end each periods (90,120 and 150 days), twenty seven (nine for fat-tail) Lambs were slaughtered for evaluating the carcass traits. Lambs were fed by grouping base on NRC tables. Results indicated fattening period and fat-tail size on daily gain, feed intake and feed conversion ratio were significant. The most daily gain was small fat-tail Lambs with 188 gr and the lowest for large fat-tail lambs with 178 gr. The increasing of fattening period was due to increase feed conversion and large fat-tail lambs have to the highest feed conversion. The results of experiment showed that fat-tail size and fattening period on carcass traits were significant. Fattening period was significantly effect on lean meat percentage, total carcass fat and bone percentage. By increasing of fattening period, fat-tail percentage increased in medium and large fat-tail lambs. The highest carcass cuts and lean meat percentage were belonging to small fat-tail lambs with fattening periods 90 days. Among hot and cold carcass lambs well as length carcass with fat-tail size were no significant (P0.05). The bots slaughter weight; fat-fat tail percentage and total fat percentage were belonging to large fat tail lambs with fattening 150 days. The lowest fat-tail percentage and total fat percentage were belonging to small fat-tail lambs with fattening 90 and 120 days. Over all, there were in small fat-tail lambs, lower cost per kg gain fore live weight, production cost each Caracas per one kg and lean meat belong to small fat-tail lambs with 90 and 120 days. Results showed that fattening periods 90 and 120 days had the suitable period. Consequently, the fattening period 90 days for small fat-tail have the best performance due to the lowest feed conversion, higher gain and the best carcass traits.