1Pursley J.R., M. O. Mee, M. C. Wiltbank. synchronization of ovulation in dairy cows using PGF2α and GnRH. Theriogenology 1995,44:915.
2Pursley JR, Silcox RW, Wiltbank MC. Effect of time of artificial insemination on pregnancy rates, calving rates, pregnancy loss, and gender ratio after synchronization of ovulation in lactating dairy cows. J Dairy Sci. 1998. 81: 2139--44.
3Portaluppi MA, Stevenson JS. Pregnancy rates in lactating dairy cows after presynchronization of estrous cycles and variations of the Ovsynch protocol. J dairy Sci. 2005. 88: 914-21.
4Brusveen DJ. Cunha AP. Silva CD, Cunha PM, Sterry RA, Silva EPB, Guenther JN, and Wilthank MC. Effects on conception rates of lactating dairy cows by altering the time of the second GnRH and AI during Ovsynch. J. Dairy Sci. 2006, 89, Suppl. 1:150.
5Hernado Lopez. Fundamental considerations for the implementation of timed artificial insemination protocols, www. absglobal.com.