Two trials were conducted to study the effect of zeranol implants on growth and sexual development of bull calves. Trial 1 compared the effects of implanting with 72 mg of zeranol at 48 d of age branding , at d of age, or at both times with nonimplanted control bulls. Implanting at branding resulted in decreased scrotal circumference, testicle weight and proportion of bulls that could produce an ejaculate at 14 mo of age P less than. Implanting at d of age had no effect on any of these traits.
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Sexual development in beef bulls following zeranol implants
Bulls getting busy | The Wider Image | Reuters
A bull stands bathed in infrared light, used to relax his muscles, at an artificial insemination centre in the Austrian village of Hohenzell. His life revolves around sex — although not with the females of his species. The bull is one of many at the centre that regularly mount either an artificial cow or another bull so that workers can collect their semen, which is sold around the world for breeding purposes. A vet at the centre kneels down to collect semen as a bull lavishes its affection on an artificial cow. The vet's job might look unpleasant, but he is working in a highly lucrative business: the centre exports cattle sperm to more than 52 countries worldwide and last year it sold approximately , samples.
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Bulls getting busy
Melton, C. Brown, P. Lewis, Jr. Twenty-five measurements of traits related to development of secondary sex characteristics were recorded from 38 yearling Hereford and Angus bulls tested in two performance tests. Traits included feedlot performance, testis weight, wholesale cut weights, certain carcass measurements and cross-sectional area of muscles in the crest region.
The purpose of this investigation was to determine the interrelationships of the various sexual and aggressive behaviors exhibited by Hereford bulls in sexual performance serving capacity tests and to determine the extent to which these interrelationships change with age maturity. Correlation matrices were constructed for the frequencies of sexual and aggressive behaviors exhibited by two groups of 13 and 14 bulls, respectively, during min tests with females when the bulls were 12, 18, and 24 mo of age. The frequencies of selected sexual behaviors recorded during individual tests at 18, 21, and 24 mo were factor-analyzed using a principle components analysis.
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