Effect of the adding Monensin on Performance and Rumen Parameters of Arabi Lambs

	Effect of the adding Monensin on Performance and Rumen Parameters of Arabi Lambs
Journal Of Wassit For Science & Medicine
Article 1, Volume 10, Issue 1, 2017, Pages 15-26
Abstract
This study was conducted in the Field of Animal of the Faculty of Agriculture in Basra University for the period from 1/11/2015 to 10/2/2016. The study included growth and digestion experiments. The digestion trail included 12 Arabi lambs ranging in age between 5-6 months with a mean weight 21 kg were randomly divided into three groups of four animals for each treatment. Ration submitted on the basis of the 3% of body weight, their quantities to be modified on the basis of the new weight of each group every two weeks. .Ration was provided twice daily, in the morning at 8 a.m. and in the evening at 4 pm. Amount of feed and the remaining was calculated daily for the purpose of calculating the amount of feed consumption. At the beginning of the experiment lambs were introduced for adaptation period of 10 days and then weighed, the registration of primary weight as initial weight. The first studied ration was considered as control (without any addition). The second ration was control (+) monensin by 100 mg/kg. The third ration was control (+) monensin by 200 mg/kg. Results showed Final weight was significantly affected by adding monensin with the superiority of the second treatment when adding monensin at a level of 100 mg/kg dry material which were recorded a 33.36 kg, while those of the first and the third groups, registered 28.61 and 29.20 kg respectively. for the overall growth rate second treatment exceeded (11.33 kg) significantly (P<0.05) the first and third groups (4.75 and 6.01 Kg respectively). The largest amount of feed consumption on the basis of dry matter was shown by second group (65.24 kg), followed by the control, which reached 60.37 kg. Feed consumption declined (P<0.05) with an increase in the proportion of monensin until it reached a value of 56.25 kg showed by third treatment, which differed significantly (P<0.05) from the first treatment (control) and second treatment. The best feed conversion efficiency of the diet recorded by the lambs of second treatment (6.97 kg dry matter consumed/ kg weight gain) which was mathematically less than that of control group (12.71 kg dry matter consumed/ kg weight gain), while it differed significantly from that of the third treatment (9.36 kg dry matter consumed/ kg weight gain). The superiority (P<0.05) of the digestion rate of dry matter of the third treatment lambs (66.25 %) in comparison with those of second and first groups (58.52 and 57.02% respectively). While there was a significant fall (P<0.05) in protein digestibility (32.59%) of the third treatment in comparison with 51.27 and 56.15% of the first and second group respectively. There were no significant differences in the average digestibility of fat fibers of the three treatments. A significant fall (P<0.05) in the value of the pH of rumen fluid of lambs received 200 mg monensin/kg dry matter which stood at 7.15 compared with the control group and the second group which reached 7.46 and 7.50 respectively. The lack of significant differences in the number of total bacteria and cellulolytic bacteria of lambs in all treatments regardless of the level of the monensin.

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