Protocols
Heat detection protocols. Animals in these protocols should
be inseminated 6 to 12 hours after the first observation of standing
heat. During peak activity (48 to 72 hours after PG for most
systems), heat detection for a total of three hours per day at
three or more times would be a minimum and a total of 5 to 6
hours better.
Protocols for use in cows include Select Synch and Select
Synch + CIDR® (Figure 1). Including the CIDR is recommended
when more cows are likely to be anestrus and/or when heat
detection prior to PG is not feasible. With Select Synch, 5 to
20% of the animals may show heat 1.5 to 2 days before PG.
Both protocols could be applied to the same group of cows, with
CIDRs selectively placed in young, thin, and/or late calving
cows.