Özet:

The feeding trial was conducted on twelve (14-18 month old) Sharabi calves of 184 kg mean body weight. The calves were randomly divided into three groups of equal number. The first group was fed a standard concentrate ration containing 16.3% crude protein and 2.8 Mcal/kg, the second and the third groups were fed the same ration supplemented with 0. 25 and 0.5 kg/ton for the 2nd and 3rd rations additives (stymulan cattle), respectively. The rations were given on base of 3% of the calves live body weight for 130 days and Wheat straw was offered ad libitum. Total feed intake and body gain were recorded. A digestibility trial was carried out on two calves from each group at the end of the feeding period. Body weights, slaughter and carcass characters were studied. The results showed significant differences (P<0.05) in daily body weight gain. The calves fed control and second rations were heavier than those fed third ration. However, calves of the 2nd group should better feed conversion and dry matter digestion index than calves of the 1st and 3rd groups. There were no significant differences in carcass traits and its meat dissection for the three groups. Also, the results referred approximately 10% of the total feeding in the cost to produce one kg live body weight or carcass weight. This decrease was in the 2nd group compared to other groups. It can be concluded that the supplementation of 0.25 kg/ton of stymulan cattle could improve the fattening growth of sharabi calves as well as improving the dry matter digestibility which in turn lower the feed cost. Which is in accordance with acclamation of the feed additive manufacturer.

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