اثر سطوح مختلف موننسين بر عملكرد و متابوليت هاي خوني بره هاي نژاد مغاني

The effect of different levels of monensin on finishing performance and blood metabolites in Moghani lambs

This investigation was carried out to study of the effect of monensin on performance, blood metabolites and urine pH of Moghani finishing lambs. Forty male Moghani lambs with mean body weight of 30.89 1.44 kg and 5-6 months of age were used in a 84-day feeding trial. The trial was carried out using completely randomized design with 4 treatments. The applied treatments were:l) control (without monensin) 2) 15 mg monensin per kg of dry matter 3) 30 mg monensin per kg of dry matter and 4) 45 mg monensin per kg of dry matter. For measuring blood metabolites and urine pH, 3 lambs were randomly selected from each treatment and blood samples were collected. The results indicated that monensin increased average daily gain and final weight in lambs fed monensin as compared with control group (P<0.05). Average daily gain and final weight were highest in 30 mg monensin group (193.69 gr, 47.24 kg respectively) and lowest in control group (135.83 gr, 42.41 kg respectively). Feed consumption was significantly different between experimental treatments. Feed consumption was highest in 15, 30 mg monensin (1.281, 1.279 Kg respectively) and lowest in control and 45 mg monensin group (1.237, 1.214 kg respectively). Although monensin improved feed conversion ratio (FCR), effect was not significant (P>0.05). Monensin had significant effect on blood glucose and phosphorus but had no significant influence on urea, calcium and total protein. Monensin had no significant effect on urine pH (P>0.05). The results of economical evaluation of experimental rations indicated that variable benefit per head lamb was highest in 30 mg monensin (137144 Rials) and lowest in control group (57650 Rials). According to this trial, due to desirable effects of monensin on lamb performance, use of monensin is recommended.