พีรศักดิ์ สุทธิโยธิน.2528.การผสมเทียม.มหาวิทยาลัยสงขลานครินทร์.หาดใหญ่.411 หน้า. วิโรจน จันทรัตน.2540.กายวิภาคและสรีรวิทยาของสัตวเลี้ยง.มหาวิทยาลัยแมโจ.เชียงใหม. Bearden H J, J W Fuquay.1980.Applied Animal Reproduction.Reston Publishing Company, Inc.,Virginai. Bone J F.1988.Animal Anatomy and Physilogy.3rded.Englewood Cliffs, New Jersey. Buergelt C D.1997.Color Atlas of Reproduction Pathology of Domestic Animals.Mosby-Year Book.Inc.St.Louis, Missouri. Currie W B.1987.Structure and Function of Domestic Animals.Butterworths, Boston. Frandson R D.1981.Anatomy and physiology of Fram Animals.3rd ed.Lea & Febiger. King G J, W W Thatcher.1993.Pregnancy.In Reproducton in Domesticated Animals. McCraken T O R A Kainer, T L Spurgeon.1999.Spurgeon’s Color Atlas of Large Animal Anatomy.The Essentials.Lippincott William & Wilkins, Philadelphia. McDonald L E.1980.Female reproductive system.In : Veterinary Endocrinology and Reproduction.3rd ed.Lea & Febiger, Philadelphia. Meijer J C, J M Fentener Van Vlissingen.1993.Gross Structure and Development of Reproductive Organs.In Reproduction in Domesticated Animals. Pineda M H.1989.Female Reproductve Systems.In Veterinary Endocrinology and Reproduction.4 th ed. Reeves J J.1987.Endocrinology of Reproduction.In Reproduction in Animals.5 th ed. Swenson M J.1984.Dukes’ physiology of domestic animals.10th ed.Cornell university press.London. Vander A J , D S Luciano.1990.Human physiology: mechanism of body function.5th ed.McGraw-Hill publishing company.New York. William O R.1991.Physiology of Domestic Animals.Lea & Febiger , Philadelphia. Wrobel K H.1993.Male Reproductive System.In Text book of Veterinary Histology.4 thed.