Effect of Using Different Types of Silages Mixtures in Dairy Goat Diets on Milk Production, Feed Conversion, Rumen Fermentation, Nutritional Value and Blood Components.

Abstract

This work was carried out on lactating goats to investigate the effect of partial replacing concentrate feed mixture (CFM) proteins by some types of silages on milk production, feed conversion and some metabolic parameters as well as economic efficiency. Eighteen dairy Zaraibi goats with average body weight 40.00 kg were divided into 3 groups (6 each). All animals were fed concentrate feed mixture (CFM) to cover 50% of their requirements recommended by NRC (1981). Treatments experimented were 50% CFM + 50% berseem silage as control rations (G1), 50% CFM + 50% mixture silage (50% berseem + 50% fodder beet) (G2), 50% CFM + 50% mixture silage (50% Ses bania +50% fodder beet) (G3) as tested rations. In addition, nine adult Zaraibi males (3 males per each group) were used with three digestion trails to evaluate the feeding values of the experimental. Results indicated that daily total DM intake per head and as g/kg 0.75 tended to silage by decrease with tested rations (G2 and G3) compared with G1, being 1132 and 1102 vs. 1152g/h and 70.93 and 69.64 vs. 72.68 g/kg0.75 respectively. Ruminal pH values were not significantly affected by treatments. While, ammonia-N concentrations tended to be significant lower with G2 and insignificant lower with G3 compared with control (G1). The opposite trend was occurred with microbial protein concentrations among treatments. Also, ruminal TVF,s concentrations were significantly increased by tested rations (G2, G3) compared with that of control one (G1) especially over 3 an 6 sampling fame . Comparison of hematological parameters revealed small fluctuations among groups fed the experimental rations in concentrations of Hb, RBC,s, Hct , MCHC, platelet and albumin. On the other hand, both total protein and globulin were also higher (7.21 and 4.36 g/dl) with G2 than those of the other group but without significance differences among them. Both AST and Alt concentrations were higher with G1 ( 17.68 and 155.00, respectively) than other groups and the differences were significant in AST activity only and just between G1 and G2. Concerning Ca and ph contents in blood, Scanty differences among the dietary treatments, however it could be observed some significant differences among treatments. Digestion coefficients of most nutrients and feeding values did not affected by the experimental treatments, otherwise CP digestibility and DCP values were significant improved by Sesbania- fodder beet silage rations (G3) than the control (G1) and the other tested rations (G2) milk yield was the highest with G3 followed by (G2), while the lowest yield with G1 and the differences were significant only between G3 and G1. Milk composition as fat, protein, lactose, total solids, solid non fat and ash was unaffected significantly by the tested rations. Accordingly, the feed conversion efficiency was better with G3 (0.82 and 0.123, respectively) and G2 ( 0.869 and 0.118, respectively) compared with berseem silage alone, G1 (0.93 and 0.134, respectively). Similarly, the economic efficiency was better with G3 compared with the other groups