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Effects of zeranol implanted during a postweaning weight gain test on testicular, semen, and endocrine characteristics of bulls.
Am J Vet Res 1994; 55(4):556-60AJ

Abstract

At initiation of a 140-day postweaning weight gain test, Angus bulls were assigned in equal numbers (n = 5) to 1 of 3 treatment groups to determine effects of implantation with zeranol, an estrogenic growth promotant, on selected reproductive characteristics. The bulls, whose age (mean +/- SD) was 233 +/- 20 days at initiation of the test (day 0), were implanted with 36 mg of zeranol on day 0, on days 0 and 60, or were not implanted. At day 140, scrotal circumference and testicular consistency were unaffected by zeranol implantation. Zeranol implantation did not affect the morphologic characteristics of semen samples collected by electroejaculation on day 139. There was no effect of zeranol treatment on paired weights of testes, epididymides, or vesicular glands from bulls at slaughter 47 to 68 days after day 140. Microscopic lesions associated with estrogenic exposure were not observed in accessory sex glands or epididymides of any bull. Histopathologic changes in the seminiferous epithelium were not induced by zeranol treatment. Implantation with zeranol did not affect body weight or hip weight at day 140 or carcass weight at slaughter. Plasma concentration of luteinizing hormone was increased (P = 0.04), whereas testosterone concentration tended to be less (P = 0.08) in both groups of zeranol-implanted bulls after administration of gonadotropin-releasing hormone on day 140.

Authors+Show Affiliations

Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana 61801.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

8017703

Citation

Floyd, J G., et al. "Effects of Zeranol Implanted During a Postweaning Weight Gain Test On Testicular, Semen, and Endocrine Characteristics of Bulls." American Journal of Veterinary Research, vol. 55, no. 4, 1994, pp. 556-60.
Floyd JG, Ott RS, Hixon JE, et al. Effects of zeranol implanted during a postweaning weight gain test on testicular, semen, and endocrine characteristics of bulls. Am J Vet Res. 1994;55(4):556-60.
Floyd, J. G., Ott, R. S., Hixon, J. E., Veeramachaneni, D. N., Willms, C. L., & Parrett, D. F. (1994). Effects of zeranol implanted during a postweaning weight gain test on testicular, semen, and endocrine characteristics of bulls. American Journal of Veterinary Research, 55(4), pp. 556-60.
Floyd JG, et al. Effects of Zeranol Implanted During a Postweaning Weight Gain Test On Testicular, Semen, and Endocrine Characteristics of Bulls. Am J Vet Res. 1994;55(4):556-60. PubMed PMID: 8017703.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of zeranol implanted during a postweaning weight gain test on testicular, semen, and endocrine characteristics of bulls. AU - Floyd,J G,Jr AU - Ott,R S, AU - Hixon,J E, AU - Veeramachaneni,D N, AU - Willms,C L, AU - Parrett,D F, PY - 1994/4/1/pubmed PY - 2001/3/28/medline PY - 1994/4/1/entrez SP - 556 EP - 60 JF - American journal of veterinary research JO - Am. J. Vet. Res. VL - 55 IS - 4 N2 - At initiation of a 140-day postweaning weight gain test, Angus bulls were assigned in equal numbers (n = 5) to 1 of 3 treatment groups to determine effects of implantation with zeranol, an estrogenic growth promotant, on selected reproductive characteristics. The bulls, whose age (mean +/- SD) was 233 +/- 20 days at initiation of the test (day 0), were implanted with 36 mg of zeranol on day 0, on days 0 and 60, or were not implanted. At day 140, scrotal circumference and testicular consistency were unaffected by zeranol implantation. Zeranol implantation did not affect the morphologic characteristics of semen samples collected by electroejaculation on day 139. There was no effect of zeranol treatment on paired weights of testes, epididymides, or vesicular glands from bulls at slaughter 47 to 68 days after day 140. Microscopic lesions associated with estrogenic exposure were not observed in accessory sex glands or epididymides of any bull. Histopathologic changes in the seminiferous epithelium were not induced by zeranol treatment. Implantation with zeranol did not affect body weight or hip weight at day 140 or carcass weight at slaughter. Plasma concentration of luteinizing hormone was increased (P = 0.04), whereas testosterone concentration tended to be less (P = 0.08) in both groups of zeranol-implanted bulls after administration of gonadotropin-releasing hormone on day 140. SN - 0002-9645 UR - https://www.unboundmedicine.com/medline/citation/8017703/Effects_of_zeranol_implanted_during_a_postweaning_weight_gain_test_on_testicular_semen_and_endocrine_characteristics_of_bulls_ DB - PRIME DP - Unbound Medicine ER -