Check out this article: How to Tell if a Cow or Heifer is in Estrus for physiological, behavioral and physical signs of heat. Most heat periods start or end around dusk or dawn.
If doing AI outside, it is best to do it on sunny warm days, not when the weather is rainy or windy or even stormy. If you have a facility that is set up inside a shed or barn, so much the better!
You only have 10 seconds to take the semen straws out!!!
The warm water should be around 95ºF (35ºC) for optimum thawing of the semen straws.
Anytime it takes over 10 seconds to locate a cane the canister must be lowered back into the tank to cool completely. Never return a unit of semen to the tank once you’ve removed it from the cane.
