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Cases of spermiogenesis in young European bison

100%

Czykier E., Krasinska M.

Acta Theriologica

2004

tom 49

nr 4

Development of spermiogenesis and sizes of seminiferous tubules of the testes and epididymal duct were studied in 45 young European bisonBison bonasus (Linnaeus, 1758) males from an enclosed breeding centre and a free-ranging population in the Białowieża Forest. Of 13 males in age class II (up to two years), four showed the presence of elongated late spermatids: one male aged 15 months from the enclosed breeding centre and three from the free-ranging population (2 males aged 18 months and one about 24 months old). Of 7 males from age class III (up to 3 years), four showed spermiogenesis, of which the youngest, 26 and 32 months old, were from enclosed breeding. Spermiogenesis was observed in males with high body weight in a given age class. In males of age class I (up to one year old), the mean diameter of the seminiferous tubules was 49.8 μm, in class II — 110.7 μm, and in class III — 162 μm, the mean diameter of the epididymal duct being 110.8 μm, 187.2 μm and 273.4 μm, respectively. Measurements of seminiferous tubules and epididymal duct were significantly correlated with age and body weight of males and differed significantly between the three age classes.

The neuronal structure of paramamillary nuclei in Bison bonasus: Nissl and Golgi pictures

84%

Robak A., Szteyn S., Rowniak M.

Folia Morphologica

1998

tom 57

nr 2

Ograniczanie wyników

1 Acta Theriologica

1 Folia Morphologica

1 Czykier E.

1 Krasinska M.

1 Robak A.

1 Rowniak M.

1 Szteyn S.

1 2004

1 1998

Wyniki wyszukiwania

Cases of spermiogenesis in young European bison

The neuronal structure of paramamillary nuclei in Bison bonasus: Nissl and Golgi pictures