Abstract
ABSTRACT This study was conducted In Animal Production Department fields, at college of agriculture and forestry, University of Mosul, by using 24awassi male lambs average body weight 26.43± 2.46 kg and their ages ranged 5-6 months, lambs were divided into four treatments and fed ration consisting of barley, wheat bran, wheat straw and urea. The lambs were fed the first treatment (control) without additives, while 10 g/lamb/day dry bread yeast (saccharomyces cerevisiae) was added to the second treatment, 10g/lamb/day of probiotic was added to the third treatment, and the fourth treatment was added in a mixture of 5 g dry bread yeast and 5 g probiotic/lamb/day. The results were showed that daily feed intake of feed was 999, 1171, 1004, 1104 g/lamb/day, Daily body weight gain increased significantly(P<0.05) 129, 201, 152, 205 g/lamb/day. Hot carcass weight incresed (P<0.05) in the second and third treatmeata as compared first (control) 19.706, 23.750, 21.380, 24.516 kg. Also results indicated that there were significant differences (P <0.05) for the third and fourth treatments in rumen pH after 2 hours of feeding were 5.43, 5.78, 6.11 , 5.97 respectively. no significant differences were noted in serum parameters. Through the results, it is noted that most of the productive representative of the additive treatments of dry bread yeast (saccharomyces cerevisiae) are added.
