scholarly journals Histological Changes in Mouse Nipple Tissue during the Reproductive Cycle.

1998 ◽  
Vol 60 (4) ◽  
pp. 405-411 ◽  
Author(s):  
Yasushi TOYOSHIMA ◽  
Seiichiroh OHSAKO ◽  
Reiko NAGANO ◽  
Mitsuharu MATSUMOTO ◽  
Sachinobu HIDAKA ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Histological Changes

scholarly journals Histological Changes of Androgenic Gland According Reproductive Cycle in Macrobrachium nipponense (De Haan, 1849)

2002 ◽  
Vol 35 (3) ◽  
pp. 253-258
Author(s):  
Dae Hyun Kim ◽  
Jung Ha Kang ◽  
Jae Young Lee ◽  
Jee Hyun Jeong ◽  
Byung Ki Kim ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Androgenic Gland ◽  
Histological Changes ◽  
Macrobrachium Nipponense

The reproductive cycle of the firetail gudgeon, Hypseleotris galii II. Seasonal histological changes in the testes

1973 ◽  
Vol 21 (1) ◽  
pp. 67 ◽  
Author(s):  
NJ Mackay
Keyword(s):  
Water Temperature ◽  
Breeding Season ◽  
Reproductive Cycle ◽  
Meiotic Division ◽  
Steroid Biosynthesis ◽  
Histological Changes ◽  
Late Autumn

Seasonal histological changes in the testis of H.galii are described. Spermatogenesis follows the cystic pattern common in anamniotes. Mitotic increase in spermatogonia occurs in late autumn, when photoperiod and water temperature are falling. The meiotic division of spermatocytes and subsequent changes of spermatogenesis are initiated when photoperiod and water temperature are rising and continue through the breeding season (November-January) until March, when water temperature begins to fall rapidly. The possible role of cholesterol-positive lobule boundary cells in steroid biosynthesis is discussed.

Reproductive biology of the Sword Snake Tomodon dorsatus (Serpentes: Dipsadidae) in South Brazil: comparisons within the tribe Tachymenini

2020 ◽  
Vol 41 (4) ◽  
pp. 445-459
Author(s):  
Luiza Loebens ◽  
Selma Maria Almeida-Santos ◽  
Sonia Zanini Cechin
Keyword(s):  
Reproductive Cycle ◽  
Reproductive Strategies ◽  
Sexual Maturity ◽  
Reproductive Effort ◽  
Caudal Vertebra ◽  
Ductus Deferens ◽  
Histological Changes ◽  
Males And Females ◽  
Autumn And Winter ◽  
South Brazil

Abstract We described the reproductive cycle, size-fecundity relationships, reproductive effort, and sexual maturity of Tomodon dorsatus in South Brazil. We examined 87 individuals (25 males and 62 females) from herpetological collections. The description of the reproductive cycle was based on the morpho-anatomical and histological changes in male testes, ductus deferens, and kidney and in female ovary and oviduct. The age at the onset of sexual maturity was estimated by skeletochronology of the caudal vertebra. The reproduction is seasonal semi-synchronous with most of the individuals showing a reproductive peak in the spring. Males and females have developed sperm storage strategies, increasing the reproductive success. Males store sperm in the ductus deferens during the autumn and winter, while females storage takes place in the utero-vaginal junction furrows during the autumn and early winter. Larger females produce a higher number of larger follicles and eggs. Females invest more in growth before reaching sexual maturity than males. Females reach sexual maturity earlier (4 years old) than males (5 years old) and have larger bodies but lower longevity. Reproductive strategies of Tachymenini specie are highly conserved.

The reproductive cycle of the firetail gudgeon, Hypseleotris galii I. Seasonal histological changes in the ovary

1973 ◽  
Vol 21 (1) ◽  
pp. 53 ◽  
Author(s):  
NJ Mackay
Keyword(s):  
Breeding Season ◽  
Reproductive Cycle ◽  
Growth Phase ◽  
Steroid Biosynthesis ◽  
Histological Changes ◽  
Primary Growth ◽  
Fish Oocytes

Seasonal histological changes in the ovary of H. galii are described. Oogenesis occurs in January and February, at the end of the breeding season. Evidence suggests that oogenesis continues in senile (post-reproductive) fish. Oocytes in the primary growth phase grow throughout the winter months. Vitellogenesis commences in August, and fish mature by November. During the breeding season (November-January) females ovulate and spawn repeatedly. Mature oocytes remaining after the breeding season become atretic. The fate of follicular derivatives and their possible role in steroid biosynthesis is discussed.

Reproductive biology of the freshwater catfish, Tandanus tandanus Mitchell, in the Gwydir River, Australia. I. Structure of the gonads

1977 ◽  
Vol 28 (2) ◽  
pp. 139 ◽  
Author(s):  
TLO Davis
Keyword(s):  
Reproductive Biology ◽  
Oocyte Maturation ◽  
Reproductive Cycle ◽  
Germ Cells ◽  
Complicated Structure ◽  
Histological Changes ◽  
Macroscopic Appearance ◽  
Freshwater Catfish ◽  
Clear Cut ◽  
The Relationship

The gross morphology and histology of the gonads of T. tandanus were examined as a preliminary to describing the reproductive cycle of this species in the Gwydir River. The macroscopic appearance of the gonads at different stages of maturity is described. The complicated structure of the testes made it difficult to classify them into well-defined stages of maturity. The relationship between the stage of maturity of the ovaries and the histological changes associated with oocyte maturation was clear cut. Six spermatogenetic stages were recognized; primary germ cells, spermatogonia, primary spermatocytes, secondary spermatocytes, spermatids, and spermatozoa. The sequence of oocyte maturation was divided into nine stages; chromatin nucleolus, early perinucleolus, late perinucleolus, yolk vesicle, primary yolk, secondary yolk, tertiary yolk, and ripe egg stage. Atresia was observed in some oocytes from the primary yolk stage onwards. The sequence of yolk resorption in atretic oocytes is described.

Studies on the marsupial glider, Schoinobates volans (Kerr) I. Reproduction

1969 ◽  
Vol 17 (4) ◽  
pp. 625 ◽  
Author(s):  
RFC Smith
Keyword(s):  
Natural Population ◽  
Breeding Season ◽  
Reproductive Cycle ◽  
Reproductive System ◽  
Sexual Maturity ◽  
Field Data ◽  
Reproductive Organs ◽  
Female Reproductive System ◽  
Histological Changes ◽  
Second Year

Field data were obtained during the period September 1962-January 1965 from 710 greater gliders, S. volans, in a natural population. Histological changes were observed in the reproductive tracts of another 129 animals shot during this period. S. volans has a short breeding season in March, April, and May, after which involution of the reproductive organs occurs in both sexes. The species is monovular and polyoestrous. Sexual maturity is attained by both sexes in the second year, following which breeding probably occurs annually. The female reproductive system shows several primitive and anomalous features, among which is the retention of the Wolffian ducts in the adult. The histology of ovaries, uteri, and vaginae at various stages of the reproductive cycle is briefly described.

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