G. Ekpe

Semen quality and sperm output of Yankasa rams at different ages.

O. Osinowo, M. Ahmed, G. Ekpe, 1988, Theriogenology.

Post-partum intervals to oestrus and conception in Yankasa sheep

O. Osinowo, G. Ekpe, 1985, The Journal of Agricultural Science.

Transient retardation in embryo growth in normal female mice made pregnant by males whose testes had been heated.

M. Surani, B. Setchell, J. L. Zupp, 1998, Human reproduction.

Preliminary study of postnatal growth and reproductive tract development in Yankasa rams

O. Osinowo, B. N. Marire, G. Ekpe, 1992 .