ABSTRACT
The objective of this study was to determine the effect of feeding refused sesame seeds (RSS) invalid for industry partially instead of concentrate feed mixture (CFM) on reproductive and productive performance, blood metabolism and economic efficiency of Zaraibi dairy goats. Fifteen healthy dairy goats aged 36.0 - 38.0 months and weighed 35.71± 0.38 kg body weight randomly divided into three equal groups (5 goats each). The 1st group fed control ration (R1) consisted of CFM and corn silage (CS), while the two tested groups fed the same control ration with substitute of 10% (G2) and 20% (G3) of CFM with RSS. The experimental rations adjusted to be isonitrogenous and isocaloric . The feeding trial continued from pre-breeding season up to 8 weeks of lactation. Results indicate that R2 and R3 diets improved fertility, where litter size were 2.40 and 2.80 compared to R1 diet (2.20), respectively. Body weight of goats during gestation, suckling and lactation periods and growth rate of kids were significantly higher with R2 and R3 than control one. Total milk yield was higher (P<0.05) in R2 (189.58kg) and R3 (182.14kg) than R1 (141.32kg) until peak of lactation (first 8 weeks). Furthermore, serum blood components as triglyceride (74.20, 72.60 and 71.40 mg/dI), LDL (137.93, 125.70 and 126.57 mg/dI) and cholesterol (180.33, 173.67 and170.33mg/dI) showed higher (P<0.05) values with R1 than R2 and R3 rations, respectively. On the contrary,the beneficial serum blood level of HDL recorded higher (P<0.05) rate for R2 (38.17mg/dI) and R3 (38.77mg/dI) than R1 (28.80mg/dI) rations. The highest economic efficiency associated with R3 (143.55%) followed by R2 (139.85%) relative to R1 (100.00%). Accordingly, we favorably encourage the producers to introduce RSS, up to 10 or 20% of CFM, because it help to reduce costs of feeding and accomplish a good reproduction and production performance for dairy goats.