This study was carried out to evaluate the effects of adding two levels of Rumi live yeast (RLY), which is a commercial probiotic containing yeast on productive performance of Rahmany lambs. Twenty-one Rahmany lambs after weaning at three months of age with an average live body weight of 19.33±0.2 Kg were assigned to three groups according to live body weight (7 lambs each). They were randomly assigned to the three experimental diets. The control group was fed 35% corn silage and 65% concentrate feed mixture on DM basis, without Rumi live yeast addition (R1, control). The other two groups were fed the same control ration along with 3 and 5g RLY/ head/day (R2 and R3, respectively). Addition of RLY significantly (P<0.05) increased average daily gain, all nutrients digestibility, digestibility of cell wall constituents (NDF, ADF, cellulose, hemicellulose) and improved feeding values (TDN and DCP%) and feed conversion. Blood constituents were generally normal in all experimental groups, however, blood plasma total protein, albumin and globulin were significantly (P<0.05) higher for animals fed 3 or 5gm RLY additives rations. Feed conversion efficiency was significantly (P<0.05) improved for lambs fed rations contained 3 or 5g RLY and the effect on daily gain was more pronounced with increasing the levels of RLY compared with the control ration. Results of growth performance showed that there were improvements with respect to total body gain and average daily gain in groups R2 and R3. Also, the best feed and relative economic efficiency were achieved by group fed 5g/h/d yeast followed by group fed 3 g/h/d yeast and the lowest was recorded with control ration. It was concluded that adding 3 or 5g of RLY to rations of growing Rahmany lambs improved their performance, digestibility, average daily gain and feed conversion and the best results were achieved with 5g/h/d supplementation level of RLY.
Twenty lactating Zaraibi goats in 2 nd-3 rd season of lactation and average live body weight of 37.5±0.41 kg were used to determine the effects of inclusion (partially or totally) three levels of distiller dried grains with soluble (DDGS) instead of undecorticated cotton seed meal (CSM) and small part of yellow corn on their productive performance. The experimental period lasted for 98 days, started after 3 months of suckling and weaning of kids. Goats were randomly assigned into four groups (5 goats each). Animals were fed according to NRC (1981) recommendations, since 50% of the total protein requirements were covered from whole corn silage (WCS) and the other 50% were assigned at rations to receive the following formulated concentrate feed mixtures : R1 concentrate feed mixture (0.0% DDGS, CFM1) control ration, R2 (8% DDGS, CFM2) , R3(16% DDGS , CFM3) and R4 (24% DDGS, CFM4) to formulate approximately four isonitrogenious and isocaloric rations. Results showed that nutrient digestibility coefficients and nutritive values in terms of TDN, DCP % , DE and ME (MJ/ kg DM) were significantly (P<0.05) improved gradually by adding DDGS levels to the tested rations. Inclusion DDGS at higher level in R3 and R4 rations lowered (P<0.05) ruminal pH values at all the sampling times. Ruminal ammonia-N concentrations were significantly higher (P<0.05) with DDGS rations than the control one. Increasing level of DDGS improved average daily milk yield (ADMY) and its composition. The highest ADMY was recorded with R4 followed by R3 rations, while R1 recorded the lowest value. Milk fat and protein% were the highest for groups fed R3 and R4. Milk total solids% improved with increasing DDGS levels. The economic efficiency (EE) values cleared that DDGS rations (R3 and R4) reflected superiority over the control ration by approximately 10.9 and 23.5% for 16 and 24% DDGS levels, respectively. The obtained EE values in the control and R2 rations were nearly similar (1.19 vs 1.21). From the nutritional and economical point of view the use of R4 (24% DDGS) to replace up to 100% of CSM in lactating goats rations could be recommended to improve goats performance and economic efficiency.
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