Effect of Feeding Mixture of Food Waste and Olive Cake on Milk Yield and Its Composition Oflactating Zaraibi Goats

Abstract

his study aimed to evaluate the effects of diets composed of ecological food waste (mixture of food waste from hotels and olive cake(FWOC)) on lactating goats productivity compared with traditional diets. The effect of inclusion mixture of food waste and olive cake in diets of Zaraibi goats on nutrients digestibility, rumen function, milk yield, milk composition and some blood parameters were studied. A feeding trial was conducted using twenty four Zaraibi goats (32.33+0.2Kg LBW and aged 3-4 years) at late pregnancy (one month before parturition). Animals were assigned into three similar groups (8 animals each) using the randomized complete block design. They were fed as groups on a basal ration, where concentrate feed mixture (CFM) was 50% of requirements according NRC (2007); while berseem as a roughage was offered at libitum.The tested rations were formulated from concentrate feed mixture (CFM) that partially substituted by 0, 15 and 30% of FWOC for CFM1, CFM2 and CFM3, respectively, along with berseem as a roughage portion to formulate the experimental rations R1 (Control), R2 and R3 as tested one. Results showed that nutrient digestibility coefficients and feeding values were improved with the higher level of FWOC (30%) in ration, than R2 and R1 (control). NH3-N values and TVF'A concentrations in the in rumen liquor were increase with increasing the level of FWOC up to 30% (R3) in ration. The vice versa trend was found among dietary treatment respecting pH values in rumen liquor. Actual milk yields were significant higher with R3 (1269.1g/d.) than control ration (R1 1047.6 and R2 1130.0 g, respectively). Concerning milk composition, R2 rations significant increased fat percentage compared with R3 ration and control one, while insignificant differ was observed with milk protein percentage among treatments, the highest value in R3. Improvement respecting milk TS was observed with FWOC rations compared with control ration with insignificant differences. No significant differences among experimental rations regarding all offspring performance measurements. At the end of the experimental period, plasma total protein was affected significantly (P<0.05) by the experimental rations with the highest value (7.75g/dl) was occurred with R3 and the lowest one (6.85g/dl) was with R1. Economic efficiency was improved by feeding ration that contained30% FWOC (R3) in comparison with R1. This study concluded that considerably to use mixture of food waste and olive cake up to 30% level could be recommended for formulation the rations of lactating Zaraibigoats. It was concluded that use 30% of mixture food waste and olive cake was more effective in lactating goats. It can pronounced enhance feed intake, digestibility, feeding values, milk production, feed efficiency, some blood parameters and economic efficiency evaluation of lactating goats.