Testicular Histomorphometric Evaluation of Zebu Bull Breeds



Título del documento: Testicular Histomorphometric Evaluation of Zebu Bull Breeds
Revista: Brazilian archives of biology and technology
Base de datos: PERIÓDICA
Número de sistema: 000392583
ISSN: 1516-8913
Autors: 1
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4
Institucions: 1Universidade Federal de Mato Grosso do Sul, Faculdade de Medicina Veterinaria e Zootecnia, Campo Grande, Mato Grosso do Sul. Brasil
2Biotran, Alfenas, Minas Gerais. Brasil
3Universidade de Cuiaba, Cuiaba, Mato Grosso. Brasil
4Empresa Brasileira de Pesquisa Agropecuaria, Pantanal, Corumba, Mato Grosso do Sul. Brasil
Any:
Període: Nov-Dic
Volum: 57
Número: 6
Paginació: 900-907
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Analítico, descriptivo
Resumen en inglés The objective of this study was to evaluate the quantitative histology and testicular biometrics in zebu bulls of different breeds. Testicular fragments of Nelore (n=10), Polled Nelore (n=6), Gir (n=5), Guzerat (n=5) and Tabapuã bulls (n=5) were used. The fragments were perfusion-fixed in Karnovsky solution, embedded in glycol methacrylate and stained with toluidine blue-1% sodium borate. The Nelore animals had a higher tubular volumetric proportion (85.2%) and greater height of the seminiferous epithelium (73.2 µm) than the Gir, Guzerat and Tabapuã breeds. The Nelore animals also had a higher volumetric proportion of Leydig cells (5.2%) than the Guzerat and Tabapuã breeds. There was no significant difference for any of these parameters between the Nelore and Polled Nelore breeds. The gonadosomatic index, seminiferous tubule diameter, cross-sectional area of the seminiferous tubule and tubule length (total length and length per gram of testicular parenchyma) did not vary among the breeds studied. The morphometric parameters evaluated suggested that the genetic selection applied to the Nelore and Polled Nelore breeds improved the efficiency of spermatogenesis in these breeders
Disciplines Medicina veterinaria y zootecnia,
Biología
Paraules clau: Bovinos,
Medicina veterinaria,
Reproducción y genética animal,
Anatomía e histología,
Testículos,
Proporción sexual,
Túbulos seminíferos
Keyword: Veterinary medicine and animal husbandry,
Biology,
Animal reproduction and genetics,
Bovines,
Veterinary medicine,
Anatomy and histology,
Cattle,
Testis,
Sex ratio,
Seminiferous tubules
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