Effects of Estradiol Benzoate Injections on the Characteristics of Bovine Semen

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Abstract
Estradiol benzoate was injected into 2 normal bulls at levels ranging from 0.99 to 70 mg per week. At levels up to and including 15 mg per week, supplementary estrogen produced statistically insignificant increases in motility, per cent live spermatozoa, volume per ejaculate, spermatozoa concentration, and total spermatozoa per ejaculate. Percent abnormal spermatozoa was decreased but the decrease was not statistically significant. Levels of 35 and 70 mg per week decreased semen quality. Seventy milligrams per week decreased the libido in one bull but had no effect on the libido of the other.
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