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This study was carried out to determine the effects of diets containing 0, 75 and 150 ppm of Yucca schidigera extract (YSE) on fattening performance of Awassi lambs. Sixteen male Awassi lambs were allocated into three groups having similar live weight. The lambs in all groups were fed with a diet containing 134 g CP and 2756 kcal ME per kg dry matter during 63 days of fattening period. Results showed that supplementation of YSE in different dosage to the diet did not affect statistically live weight gain, feed intake and feed conversion ratio (p>0.05). However, total live weight gained at end of the fattening period slightly increased by feeding 150 ppm YSE and feed conversion ratio was improved compared to control group.
This study was aimed to compare fattening performance, slaughter characteristics of Simmental (n=20) and Black & White (n=20) young bulls under subtropical climate conditions. Animals in both breeds in (5 equal groups for each breed) were fed on a diet containing 162 g CP and 10.7 MJ ME kg-1, based on body weight criterion for 120 days. With respect to total live weight gain and daily live weight gain, Simmental young bulls were higher than Black & White young bulls (168.1 kg vs. 141.8 kg and 1.401 vs. 1.181 kg). Besides, the feed conversion ratio data show that Simmental young bulls converted feed to body mass more efficiently than that of Black & White young bulls (6.49 vs. 7.44, kg feed : kg gain). Slaughter weight and hot carcass dressing percentage in Simmental and Black & White young bulls were found out as 445.4 kg vs. 416.3 kg and 57.15 % vs. 56.04 %, respectively. These results showed that Simmental breed was more preferable than Black & White breed under subtropical climate condition with respect to fattening performance and slaughter characteristics for beef production.