1. Thirty-six greyhound bitches between the ages of six and 12 months have been oophorectomised.
2. The oophorectomised bitches have never shown the psychological or clinical symptoms of "heat".
3. Two oophorectomised bitches have shown a tendency to slight increase in weight, 2-3 pounds, above that estimated as their best racing weights. Difficulty has been experienced in controlling the weight of these two bitches.
4. The performance of the oophorectomised bitches has been comparable with that of their litter sisters.
5. Oophorectomy appears to be a practical method of overcoming the difficulty experienced with greyhound bitches necessitating enforced rest from racing following each "heat" period.
6. Greyhound stud owners should consider the advisability of oophorectomising all females not destined for stud purposes.
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