الفهرس 
1.INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The experimental work of the present study was carried out at El-Gemmaiza Experimental Station, Animal Production Research Institute, Agriculture Research Center, Egypt. This work was initiated in 15 September, 2019 and terminated in September, 2020. Three experiments were conducted to investigate the effects of treatment of doe or buck goats with L-carnitine, Coenzyme Q10 and Zinc-methionine on productive and reproductive performance and some blood parameters of female and male Damascus goats, under Egyptian environmental conditions. In the 1st experiments, a total number of 40 healthy Damascus does aged 1.5-2 years and weighed 41.5±1.50 kg were used during the breeding season and assigned to four groups (10 does in each) to study the effects of treatment with L-carnitine, Coenzyme Q10 and Zinc-methionine on some physiological aspects oestrus, ovarian activities, progesterone and estrogen concentration as well as, some blood parameters. The first group (control) was fed basal ration composed of 60% concentrate feed mixture (CFM) plus 20% clover hay and 20% rice straw. The 2nd group was fed basal ration and injected with 50 mg L-carnitine /Kg live body weight twice weekly. The 3rd group was fed basal ration and injected with 6 mg Coenzyme Q10/kg live body weight twice weekly. The 4th group was fed basal ration and orally administered daily 25 mg Zinc-methionine, oestrus, ovarian activities, progesterone and estrogen concentration as well as, some blood parameters were determined. In the 2nd experiment, a total number of 40 healthy Damascus does aged 1.9-2.4 years and weighed 44.1±1.12 kg were used to study the effects of treatment with L-carnitine, Coenzyme Q10 and Zinc-methionine during late pregnancy and lactation periods (February up to May 2020) on milk yield and composition, some blood metabolites, oxidative enzymes, hormonal activity, reproductive performance and growth performance of kids. Damascus does were assigned to four groups (10 does in each), as mentioned above in the 1st experiment. In the 3rd experiment, a total number of twelve healthy Damascus goats’ bucks aged 1.7-2.3 years and weighed 56.7±1.34 kg were used to study the effects of treatment with L-carnitine, Coenzyme Q10 and Zinc-methionine on semen quality and some blood parameters in Damascus goat bucks. The bucks were assigned to four groups (3 bucks in each group). Physical semen characteristics, physiological response parameters and blood biochemical parameters were determined. The results of this study could be summarized as follows: 1- Damascus does treated with L-carnitine, Coenzyme Q10 and Zinc-methionine showed the highest oestrus activity as compared to the control. Does of goats treated with Zinc-methionine being the highest in showing oestrus (90%) as compared to those with the L-carnitine (80%), Coenzyme Q10 (60%) and control (70%). However, non-return to oestrus (%) was significantly increased (P<0.01) in does treated with L-carnitine(100%), Coenzyme Q10 (83.33%) and Zinc-methionine (88.89%) as compared to the control group (25.5%). The duration of oestrus (%) was significantly increased (P<0.01) in dose treated with L-carnitine as compared to the other experimental groups. Shortening of onset of oestrus and day of oestrus were significantly improved (P<0.01 or P<0.05) in Damascus goats treated with L-carnitine, Coenzyme Q10 and Zinc-methionine compared to control.