Effect of Tongkat Ali (Eurycoma longifolia) extract on chilled and frozen bull semen quality - Baiee, Falah Hasan Ali; Haron, Abd Wahid; Yusoff, Rosnina; Omar, Mohamed Ariff; Degu, Nurhusien Yimer; Mada, Khumran Armiya'u; Jeber, Zaid Khuder Mahmood; Ghareeb, Salman Hammadi; Abdelbagi, Tarig Abdelrouf Ahmedeltayeb (Malaysian Society of Animal Production, 2015)