Mark Z. Johnson, Oklahoma State University Extension Beef Cattle Breeding Specialist — You have decided to use artificial insemination (AI) to breed your cows this spring. You have planned your heat synchronization protocol, selected the AI sire and ordered the semen. Now what? First, we address the signs of standing heat in cows and heifers. These include: Standing to be mounted by herd mates. This is the “silver bullet” sign of standing heat. 1. Mounting other cows 2. Clear mucus discharge from vulva 3. Swelling and reddening of the vulva 4. Bawling, trailing other cows and restlessness 5. Rubbed hair…

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