FeralStat[TM], a synthetic progestin, prevents female cats from coming into heat
At the first of the season -- in Oregon this year the season opens August 24, in Utah August 22 -- few cows are coming into heat
, so you seldom hear a bull bugle unless you call first.
This happens when there is a "normal" first rut and all or most mature does breed a significant number of fawns are in good physical condition due to excellent forage, then a second rut occurs due to fawns coming into heat
approximately a month after the primary rut.
According to the American Veterinary Medical Association, a drug called Estrus is used to temporarily prevent mares from coming into heat
, but it would not be an effective weapon for date rapists.
Bulls are continually traveling through the herd, checking cows to detect the ones that are in heat or coming into heat
These may be fawns coming into heat
for the first time, or they may be does that simply did not get bred -- an uncommon occurrence -- during their initial estrous period and come back into heat 28 to 30 days later.