Sensitive periods for Ovsynch treatment
Keywords: cow, synchronize, bovine, estrous, estrus, cycle,
follicle, wave, Ovsynch
A diagram modified from several sources, showing an estrous
cycle with three follicle waves. The physiology of two or three follicle waves
is important during “Ovsych” treatment (GnRH-Prostaglandin-GnRH) because it is
only those follicles that have already been recruited and already growing in a
follicle wave that will ovulate after GnRH treatment; an essential step in
re-setting the recruitment of follicles so that a mature follicle will be
available for ovulation about 8 to 9 days later. This image shows the periods
of time (vertical grey bars) during which follicles can be induced to ovulate
by GnRH treatment.