%0 Journal Article %A Hamid. Gholami and Mohammad. Chamani and Armin. Towhidi and Mohammad. H. Fazeli %D 2010 %J International Journal of Animal and Veterinary Sciences %B World Academy of Science, Engineering and Technology %I Open Science Index 44, 2010 %T Improvement of Semen Quality in Holstein Bulls during Heat Stress by Supplementing Omega-3 Fatty Acids %U https://publications.waset.org/pdf/775 %V 44 %X The aim of current study was to investigate the changes in the quality parameters of Holstein bull semen during the heat stress and the effect of feeding a source of omega-3 fatty acids in this period. Samples were obtained from 19 Holstein bulls during the expected time of heat stress in Iran (June to September 2009). Control group (n=10) were fed a standard concentrate feed while treatment group (n=9) had this feed top dressed with 100 g of an omega-3 enriched nutriceutical. Semen quality was assessed on ejaculates collected after 1, 5, 9 and 12 weeks of supplementation. Computer-assisted assessment of sperm motility, viability (eosinnigrosin) and hypo-osmotic swelling test (HOST) were conducted. Heat stress affected sperm quality parameters by week 5 and 9 (p %P 540 - 546