Effect of steroid implants on sexual behavior of beef calves |
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Authors: | John L. Lesmeister Earl F. Ellington |
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Affiliation: | Department of Animal Science, University of Nebraska, Lincoln 68583 USA |
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Abstract: | The sexual behavior of 53 beef heifers and 66 beef steers was observed and recorded for 7 days following insertion of subcutaneous ear implants at 2 months of age. Thirty-five of the heifers were implanted with Synovex S (200 mg of progesterone and 20 mg of estradiol benzoate). Forty-four of the steers were implanted with Synovex H (200 mg of testosterone and 20 mg of estradiol benzoate). The remaining 18 heifers and 22 steers served as nonimplanted controls. Synovex S treatment increased the incidence of mounting (P < 0.005) and mounting receptivity (P < 0.005) of heifers, while Synovex H treatment had only slight effect, if any, on the mounting behavior (P < 0.25) and mounting receptivity (P < 0.25) of steers. Both steers and heifers mounted heifers more frequently than steers (P < 0.005). Heifers were mounted with similar frequencies by both heifers and steers (P < 0.90), while steers were mounted only by heifers (P < 0.15). |
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Keywords: | To whom all correspondence should be addressed. |
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