Testicular features of semi-confined Nellore bulls subjected to immunocastration

Authors

  • Luciana da Silva Leal Karolewski Universidade Estadual de Ponta Grossa, Departamento de Zootecnia, Laboratório de Anatomia e Reprodução Animal http://orcid.org/0000-0002-6991-8317
  • Valmir Fernandes Universidade Paranaense, Instituto Superior de Ciências Biológica
  • Leonardo Acácio Ferreira de Souza
  • Gustavo de Freitas Baise
  • Ranulfo Piau Júnior Universidade Paranaense, Curso de Medicina Veterinária, Laboratório de Morfologia https://orcid.org/0000-0003-4765-6544
  • Rita de Cássia Lima Ribeiro Universidade Paranaense, Curso de Medicina Veterinária, Laboratório de Patologia Animal

DOI:

https://doi.org/10.11606/issn.1678-4456.bjvras.2020.171210

Keywords:

Beef cattle, Biometry, Histology, Immunization, Seminiferous tubules

Abstract

This study aimed to evaluate the effect of immunocastration on the scrotal circumference, as well as in the macroscopic and microscopic testicular features in Nellore bulls bred under a semi-confining system for 91 days. Sixty animals were divided into two groups: 30 intact animals (non-vaccinated) and 30 immunocastrated animals. The immunocastrated animals were treated with two anti-GnRH vaccine doses (BoprivaTM - Zoetis Australia Pty Ltd). The scrotal circumference (SC) was measured on days 0 and 56. Testicular parameters: biometry traits (length, width, and height – cm; volume – cm3 ) and weight (g) was measured on day 91. Three testicles from each group were histologically processed to find the seminiferous tubule diameter and epithelium thickness (µm). Data were analyzed in the Minitab® 19 statistical software. The macroscopic features (SC, and testes weight, volume, length, width, and height) and the microscopic features (seminiferous tubule diameter and epithelium thickness) were compared between the two groups through Student’s t-test and Mann-Whitney test. All the values were lower (p<0.05) in animals immunized against GnRH, except for the right testis width and seminiferous tubule diameter. Results indicate that immunization against GnRH affected testicular development.

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Author Biographies

Luciana da Silva Leal Karolewski, Universidade Estadual de Ponta Grossa, Departamento de Zootecnia, Laboratório de Anatomia e Reprodução Animal

Profa. Dra. do Departamento de Zootecnia, Universidade Estadual de Ponta Grossa.

Valmir Fernandes, Universidade Paranaense, Instituto Superior de Ciências Biológica

Agrônomo, médico veterinário e professor da Universidade Paranaense.

Leonardo Acácio Ferreira de Souza

Médico Veterinário formado pela Universidade Paranaense.

Gustavo de Freitas Baise

Médico Veterinário formado pela Universidade Paranaense.

Ranulfo Piau Júnior, Universidade Paranaense, Curso de Medicina Veterinária, Laboratório de Morfologia

Prof. Dr. do curso de Medicina Veterinária e da Pós-graduação da Universidade Paranaense.

Rita de Cássia Lima Ribeiro, Universidade Paranaense, Curso de Medicina Veterinária, Laboratório de Patologia Animal

Profa. Dra. do curso de Medicina Veterinária e Pós-graduação da Universidade Paranaense.

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Published

2020-12-11

How to Cite

Karolewski, L. da S. L., Fernandes, V., Souza, L. A. F. de, Baise, G. de F., Piau Júnior, R., & Ribeiro, R. de C. L. (2020). Testicular features of semi-confined Nellore bulls subjected to immunocastration. Brazilian Journal of Veterinary Research and Animal Science, 57(4), e171210. https://doi.org/10.11606/issn.1678-4456.bjvras.2020.171210

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