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This study was conducted to investigate the effect of inclusion fermented field (Potato vines & rice straw) and food industrial by-product (dried beet pulp & molasses) mixture (FBM) to be replacement with clover hay in dairy goats does diets and its effect on nutrient digestibility, milk yield, milk composition and some blood parameters. Eighteen lactating Zaraibi goats does, average live body weight of 40.5+ 1.5 kg at the 3 and 4 parities were divided randomly into three similar groups (6 animals each), were used to receive one of 3 experimental diets. The first group was received concentrate feed mixture (CFM) and clover hay (CH) as control diet (CD). Meanwhile, second and third group received CFM and replacement (CH) with (FBM1) which composed of 65% potatoes vines (PV), 12 % dried beet pulp (DBP), 15% rice straw (RS) and 8% molasses as (TD1) group or with (FBM2) which composed of 74% potatoes vines( PV), 14% dried beet pulp ( DBP), 7% rice straw (RS) and 5% molasses (on dry matter basis) as (TD2) group. The FBM based silage contained on average 41.7 & 40.5% dry matter, 12.45 & 12.83% crude protein (CP), and 55.4 & 52.6% neutral detergent fiber (NDF), 44.7 & 40.8% acid detergent fiber (ADF), Ether extract 2.5 &2.2% and ash content 9.5 &10.3%, for (FBM1 & FBM2), respectively. Results showed that there were no significant differences between two fermented by–products mixtures (FBM1 and FBM2) concerning NH3-N concentration and pH value. It was also observed that there was an increase in concentration of total volatile fatty acids with mixture (FBM2) compared with (FBM1) mixture. The highest (P<0.05) digestibility of DM, CP, NDF and ADF was recorded with (TD2). The nutritive values as TDN, DCP and ME (Mcal/kg) of (TD1 &TD2) were significantly (P<0.05) improved compared with control group. While, increasing in TDN for (TD1) was significantly . The highest significantly (P<0.05) value of milk yield was recorded for group TD2 as compared with control diet (CD), but there were no significant differences between (TD1) and (TD2) group was recorded. Meanwhile, the lowest value of milk yield was recorded with control diet (CD). There were no significant differences between the tested groups concerning milk composition percentages which were almost similar among experimental groups. Also, there were no significant differences between tested groups for some blood parameters (Glucose, AST and ALT). The feeding cost / head /day was decreased by 8.8 and 10.5 % with TD1 and TD2 groups, respectively as compared with control group, leading to an improvement of economic efficiency by 32.7 and 43.6%, with TD1 and TD2 diets, respectively compared with control group. Therefore, the replacement of clover hay with fermented by-products mixtures (FBM1&FBM2) with dairy goats does diet is highly recommended in the feeding practices of goats.

journal of animal and poultry production

Nutritional Evaluation of Fermented by-Products Mixtures in Comparison with Clover Hay and Impact of Its Feeding on Productive Performance of Zaraibi Goats.