M. M. Pourseif, G. Moghaddam, Seyed Abbas Rafat, H. Daghighkia, A. Pourseif
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Photoperiod as a Factor for Studying Fluctuations ofSeminal Traits during Breeding and Non-BreedingSeason
The main purpose of this study was to evaluate the influence of the photoperiod on the seminal traits of crossbreed wool-producing rams throughout one year period. For the effect of photoperiod, two periods were considered: decreasing daylight length (summer and autumn) and increasing daylight length (winter and spring). For this study, 5 Baluchi × Moghani (BL × MG) and 5 Arkharmerino × Moghani (AM × MG) rams were used. Semen collections were performed from first of October, 2010 to the end of September, 2011. After a training period of 2 weeks, semen ejaculates were evaluated for volume, total sperm count/ejaculate (TSE), sperm concentration, semen color, wave motion, percentage of progressive motility, percentage of live and abnormal sperm, pH, methylene blue reduction time (MBRT) and semen index (semen volume × sperm concentration/ml × live sperm% × progressive motility%). Analysis of the yearlong data showed that semen samples with the best quality were collected in September to November (P 0.05), significant seasonal variations of semen traits were observed for all seminal traits except for progressive motility, percentage of live sperm and MBRT. Although there were significant seasonal changes in seminal traits of the crosses; the fresh semen showed adequate quality to be used for breeding purposes throughout the year.
期刊介绍：
Iranian Journal of Applied Animal Science (IJAS) is an international journal publishing Research Articles (Full-Length Original Scientific Papers), Short Communications and Review on animal sciences, and related areas. The journal covers all related topics of Animal Science. Papers are welcome reporting studies in all aspects of animal science including: - Animal breeding and genetics (such as quantitative and molecular analysis of animal performance, genetic improvement and resources, genetics of physiological process, selection schemes for economic animal improvement, impact on animal health, etc) - Animal feeding and nutrition (such as food intake, digestion, nutrigenomics/nutrient: gene interactions, metabolism and metabolomics, nutritional control of function and performance, feed evaluation and feeding, diet and animal health) - Animal reproduction - Animal biotechnology - Animal physiology and functional biology of systems (such as reproductive and developmental biology, growth, muscle biology, lactation, exercise, product composition etc) - Animal ethology, behavior and welfare (such as social and sexual behavior, animal- man relationships, adaptation, stress, impact of management and environment on health, etc) - Animal products technology - Animal management and economics - Animal products processing and animal by-products - Animal microbiology - Livestock farming systems, environmental impact and climate changes (such as sustainable livestock management systems, whole farm management strategies, animal work, systems modeling, traceability, socio-economic consequences of systems, the impact of animals on biodiversity and landscape and climate changes, etc). - Other related topics (such as engineering, farming and land-use management and to other disciplines in relation to animal science).
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