1-94th Conference of Japanese Society of Animal Reproduction, Tokyo, Japan (5-7 September, 2001).

2- 4^th International conference on Farm Animal Endocrinology, Italy (7-10 October, 2001).

3- Japanese Society Veterinary Meeting No: 133, Tokyo, Japan (28-30 March, 2002).

4- 17th symposium of Society for Pituitary Research, Tokyo, Japan (1-2 August, 2002).

5- Scientific conference No 103 for animal researches, Japan (29-31 March, 2004).

6- 9^th International conference on reproductive immunology, Japan (16 October, 2004).

7- 9^th International Mammalogical conference, Japan (31 July to August 5, 2005).

8- 18th Annual Meeting of Egyptian Society of Reproduction and Fertility (Jan. 28-Feb.1, 2006).

9- International conference on plastination, Zagazig, Egypt (12-18 February, 2006).

10- 4th international conference of Faculty of Veterinary Medicine, Suez Canal University, Egypt (November 21-23, 2006).

11-Joint meeting of Japanese Society of Animal Reproduction and Japanese Society of Endocrinology, Japan (19-21 October 2007).

12- First Veterinary Conference, Omar AL-Mokhtar University, Libya (3-5) July, 2010.