Soede, N.M., Wetzels, C.C.H., Zondag, W., de Koning, M.A.I. and Kemp, B. 1995. Effects of time of insemination relative to ovulation, as determined by ultrasonography, on fertilization rate and accessory sperm count in sows. Soede, N.M. and Kemp, B. 1997. Expression of oestrus and timing of ovulation in pigs. Steverink, D.W.B., Soede, N.M., Bouwman, E.G. and Kemp, B. 1997.
Fertilisation results as influenced by insemination to ovulation interval and sperm dosage in sows.
Waberski, D. 1997. Effects of semen components on ovulation and fertilisation. Weitze, K.F., Wagner-Rietschel, H., Waberski, D., Richter, L. and Krieter, J. 1994. The onset of heat after weaning, heat duration and ovulation as major factors in AI timing in sows.