Annual reproductive cycle and sexual dimorphism in the dragonet,repomucenus valenciennei, in tokyo bay, japan

1998 ◽  
Vol 45 (2) ◽  
pp. 157-164 ◽  
Author(s):  
Kou Ikejima ◽  
Makoto Shimizu
Keyword(s):  
Sexual Dimorphism ◽  
Reproductive Cycle ◽  
Tokyo Bay ◽  
Annual Reproductive Cycle ◽  
Repomucenus Valenciennei

Mechanisms underlying pituitary microvascular remodelling in thoroughbred horses during the annual reproductive cycle

2014 ◽  
Author(s):  
Angus Yeomans ◽  
Nichol Thompson ◽  
Jennifer Castle-Miller ◽  
David O Bates ◽  
Domingo Tortonese
Keyword(s):  
Reproductive Cycle ◽  
Annual Reproductive Cycle ◽  
Thoroughbred Horses

scholarly journals Proliferative and Apoptotic Pathways in the Testis of Quail Coturnix coturnix during the Seasonal Reproductive Cycle

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1729
Author(s):  
Sara Falvo ◽  
Luigi Rosati ◽  
Maria Maddalena Di Fiore ◽  
Federica Di Giacomo Russo ◽  
Gabriella Chieffi Baccari ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Second Messengers ◽  
Reproductive Period ◽  
Annual Reproductive Cycle ◽  
Coturnix Coturnix ◽  
Immunohistochemistry Analysis ◽  
17Β Estradiol ◽  
Apoptotic Pathways ◽  
Camp And Cgmp ◽  
Activation Phase

The quail Coturnix coturnix is a seasonal breeding species, with the annual reproductive cycle of its testes comprising an activation phase and a regression phase. Our previous results have proven that the testicular levels of both 17β-estradiol (E2) and androgens are higher during the reproductive period compared to the non-reproductive period, which led us to hypothesize that estrogens and androgens may act synergistically to initiate spermatogenesis. The present study was, therefore, aimed to investigate the estrogen responsive system in quail testis in relation to the reproduction seasonality, with a focus on the molecular pathways elicited in both active and regressive quail testes. Western blotting and immunohistochemistry analysis revealed that the expression of ERα, which is the predominant form of estrogen receptors in quail testis, was correlated with E2 concentration, suggesting that increased levels of E2-induced ERα could play a key role in the resumption of spermatogenesis during the reproductive period, when both PCNA and SYCP3, the mitotic and meiotic markers, respectively, were also increased. In the reproductive period we also found the activation of the ERK1/2 and Akt-1 kinase pathways and an increase in second messengers cAMP and cGMP levels. In the non-reproductive phase, when the E2/ERα levels were low, the inactivation of ERK1/2 and Akt-1 pathways favored apoptotic events due to an increase in the levels of Bax and cytochrome C, with a consequent regression of the gonad.

Peptidergic neurohormonal systems in the basal hypothalamus of the ferret and the mink: Immunocytochemical study of variations during the annual reproductive cycle

1988 ◽  
Vol 251 (1) ◽  
pp. 153-159 ◽  
Author(s):  
L. Boissin-Agasse ◽  
G. Alonso ◽  
G. Roch ◽  
J. Boissin
Keyword(s):  
Reproductive Cycle ◽  
Immunocytochemical Study ◽  
Annual Reproductive Cycle

Annual reproductive cycle of the greasyback shrimp Metapenaeus ensis in Ise Bay, Japan

2021 ◽  
Author(s):  
Fumihiro Yamane ◽  
Katsuyoshi Suitoh ◽  
Takuji Okumura ◽  
Kenji Toyota ◽  
Naoaki Tsutsui ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Annual Reproductive Cycle ◽  
Metapenaeus Ensis ◽  
Ise Bay

scholarly journals Distribution and reproductive biology of the Electric ray Discopyge tschudii Heckel, 1846 in San Matías Gulf, Northern Patagonia, Argentina

2011 ◽  
Vol 9 (4) ◽  
pp. 831-838 ◽  
Author(s):  
Marilú Estalles ◽  
Nidia Marina Coller ◽  
Edgardo Ernesto Di Giácomo ◽  
María Raquel Perier
Keyword(s):  
Sexual Dimorphism ◽  
Reproductive Biology ◽  
Reproductive Cycle ◽  
Southern Chile ◽  
Southern Brazil ◽  
Southwest Atlantic ◽  
Aggregate Distribution ◽  
Northern Patagonia ◽  
Southeast Pacific ◽  
Discopyge Tschudii

The Electric ray Discopyge tschudii is distributed in the Southwest Atlantic from southern Brazil to southern Argentina and in the Southeast Pacific from Peru to southern Chile. The main threat to this species is fishing. Discopyge tschudii is noncommercial and individuals caught are discarded on board. The present study analyzes the distribution and the morphological and reproductive characteristics of this ray in San Matías Gulf (SMG), Argentina. A total of 1087 individuals were analyzed. The species presented an aggregate distribution, with the main concentrations in the northern and eastern areas of SMG, at depths below 100 m. Males ranged from 9 to 43 cm and females from 11 to 38 cm. The species presented sexual dimorphism. Males were larger and heavier than females and also matured at larger sizes. Size at 50% of maturity was estimated at 30 cm for males and 21 cm for females. A total of 199 embryos were sampled and the proportion of sexes showed no significant differences from the expected 1:1. The number of embryos per female varied from 1 to 12. The most frequent values were 2 and 5. Length at birth was estimated at 82.17 ± 3.87 mm. Based on our findings, we hypothesize that the electric ray D. tschudii completes its reproductive cycle in SMG.

Changes in Proto-oncogene Activity in the Testis of the Frog, Rana esculenta, during the Annual Reproductive Cycle

1995 ◽  
Vol 99 (2) ◽  
pp. 127-136 ◽  
Author(s):  
Paolo Chieffi ◽  
Sergio Minucci ◽  
Gilda Cobellis ◽  
Silvia Fasano ◽  
Riccardo Pierantoni
Keyword(s):  
Reproductive Cycle ◽  
Rana Esculenta ◽  
Annual Reproductive Cycle

Temporal relationship between the circulating profiles of melatonin and ovarian steroids under natural photo-thermal conditions in an annual reproductive cycle in carpCatla catla

2009 ◽  
Vol 40 (4) ◽  
pp. 347-359 ◽  
Author(s):  
Asamanja Chattoraj ◽  
Mohua Seth ◽  
Anupam Basu ◽  
T. G. Shrivastav ◽  
Sepp Porta ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Temporal Relationship ◽  
Thermal Conditions ◽  
Annual Reproductive Cycle ◽  
Ovarian Steroids

Effects of captivity stress on plasma steroid levels in the green frog, rana esculenta, during the annual reproductive cycle

1991 ◽  
Vol 98 (3-4) ◽  
pp. 491-496 ◽  
Author(s):  
Massimo Zerani ◽  
Fabrizia Amabili ◽  
Gilberto Mosconi ◽  
Anna Gobbetti
Keyword(s):  
Reproductive Cycle ◽  
Rana Esculenta ◽  
Green Frog ◽  
Annual Reproductive Cycle
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