Where inside the reproductive tract of the rooster is semen produced, and what is the optimal site for artificial insemination inside the hen?

In commercial brown layer breeding, artificial insemination (AI) is widely used to maintain high fertility. In the rooster, semen is produced in the paired abdominal testes and matures as it passes through the vasa deferentia. For successful insemination, semen must be collected and immediately deposited into the hen. The technician must evert the hen's cloaca to expose the vaginal opening (located on the left side of the cloaca). The optimal site for depositing the semen is 2 to 3 cm deep within this vaginal lumen. Depositing too shallowly leads to semen expulsion, while depositing too deeply can cause oviduct trauma and lower fertility. Farmers can read artificial breeding manuals in the Poultry Encyclopedia, buy semen collection cups and micro-pipettes on Poultry Plaza, track day-old chick rates on Poultry Rates, and trade parent stock on Murghi Mandi.