Department of Animal Sciences, College of Agriculture, Can Tho University, Viet Nam.
Department of Animal Sciences, College of Agriculture, Can Tho University, Viet Nam.
Department of Animal Sciences, College of Agriculture, Can Tho University, Viet Nam.
Artificial insemination has been used recently in chickens to improve fertilization rates in local breeds; however, one of the factors affecting semen quality of chickens is peroxidation lipid in sperm because it contains many long-chain polyunsaturated fatty acids, which cause damage to sperm and reduce fertility in chickens. Therefore, the objective of this study was to find out the best level of vitamin E supplementation and the best time of semen collection as a basis for the improvement and improvement of sperm quality of Noi crossbred cocks. This study was designed completely randomized with 20 Noi crossbred cocks (10-12 months of age, 2037.6 ± 134.6 g of body weight) were fed 5 dietaries of vitamin E (0.75 and 125 mg with/without germinated rice [Gr] and 2 semen collection times (3 and 7 days) with 10 replicates/9 collection times. Semen samples were stored at 5 oC and sperm quality was analyzed at 0, 4, 6, and 12 hours of time storage. Vitamin E supplementation had no effect on semen weight and semen collection time nor on sperm volume of roosters (P > 0.05). However, E75Gr gave the largest volume of semen (0.34 ml), the highest pH, and the lowest sperm concentration. The time of collection at 7 days had the heaviest semen weight (0.43 g), while in 3 days had the highest pH and lowest sperm concentration. The interaction between vitamin E supplementation and the collection time was statistically significant in terms of semen pH and percentage of sperm abnormality (P < 0.05). There was a significant difference in pH among treatments supplemented with vitamin E at 0 and 4 hours after semen storage (P < 0.05). At 4 hours and 6 hours of storage, the percentage of sperm abnormality had a statistically significant difference among treatments (P < 0.05), E75Gr had the lowest value compared to the peak of E75 (P < 0.05). The research results recommended supplementing with E75Gr diet and collecting semen at 7 days for the best sperm quality.
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