Reproductive performance of rams under arid conditions
semanticscholar(2013)
摘要
Evaluation of the effect of breed and season on some semen physical characteristics and plasma testosterone concentration was the main objectives of this study. This study was carried out at the El-Khurmah farmers of El-Khurmah Governorate which belonging to Taif city(KSA). The study was carried out in two seasons: summer (June to August) and autumn (September to November). A Total of 20 fertile rams (ten of Najdi breed with a mean body weight of 45.13± 3.5 kg and ten of Harri breed with a mean body weight of 40.74 ± 3.8 kg) were used in this study. They aged 12–18 months old and not used for breeding during the study. Live body weight (LBW), and plasma testosterone (TC) concentration was determined biweekly per season. In addition, In both breeds, six ejaculates (via an artificial vagina) from each ram per season were collected and semen was evaluated for ejaculate volume (EV), total sperm output per ejaculate (TSO), sperm concentration (SC), sperm mass motility (SMM), sperm progressive motility (SPM), live sperm percentage (LSP)and semen pH. The results indicated that LBW, EV and TC differed significantly (P<0.01) between breeds where Najdi rams recorded the higher (45.55±0.06, 1.02±0.01 and 7.55±0.04) values than Heri rams (41.16±0.05kg, 0.96±0.01ml and 6.85±0.02 ngml) for LBW, EV and TC, respectively. In both breeds, semen EV, SMM and SPM were higher during summer (0.99±0.01,4.24±0.07 and 82.8±0.09 respectively) than autumn season (0.98±0.01ml,3.6±0.07 and 77.9±0.10,respectively), while semen pH, LSP and TC were lower during summer (7.51±0.01,78.7±0.21 and 7.04±0.04, respectively) than autumn season (8.3±0.01,80.15±0.10 and 7.35±0.05 ngml,respectively). Results showed that, plasma TC and semen of superior quantity and quality are especially collected at the middle of summer and autumn seasons in both breeds. In conclusion, this study indicates that type of breed and season influence some semen physical characteristics and plasma testosterone concentration of rams. Accordingly, these factors should be considered to improve the productivity of sheep under semi-arid conditions. [Hassanin, S.H. ;A. F. Hussein; Y. A. Khattab,and M. A. Abdalla. Reproductive performance of rams under arid conditions. Life Sci J 2013; 10(4):2596-2605]. (ISSN: 1097-8135). http://www.lifesciencesite.com. 347
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