Goat Heat Cycle: Signs of Heat and How to Detect It

You cannot breed a doe that is not in heat - so learning to read the heat cycle is the first skill every goat breeder needs. Here is how the goat estrous cycle works and how to spot it.

How often do goats come into heat?

A doe cycles roughly every 18-22 days during the breeding season, and each standing heat lasts about 12-36 hours. That short window is why detection matters: miss it and you wait almost three weeks for the next chance.

Signs of heat in goats

• Tail flagging - rapid side-to-side wagging
• Loud, frequent calling, often out of character
• A swollen, reddened vulva with clear, stringy discharge
• Restlessness, reduced appetite, or a drop in milk
• Mounting other does, or standing to be mounted
• Interest in a buck, or in buck scent

Detecting a silent heat

Some does show few signs - a "silent" heat. A buck rag (a cloth rubbed on a buck and kept in a sealed jar) can help: presenting it often provokes a reaction in a doe that is cycling. A buck or wether with a marking harness is the most reliable detector of all.

Timing the breeding

The classic guideline is to breed roughly 12 hours after standing heat begins, and again 12 hours later. Two or three matings across the window give the best chance she settles. Then record the date and open the gestation calculator for the due date.

Ready for the next step? Read our goat breeding guide, or the reproduction section of the Merck Veterinary Manual.