Seasonal differences in progesterone production by luteinized bovine thecal and granulosa cells

Wolfenson, D.; Sonego, Hagar; Bloch, A.; Shaham-Albalancy, A.; Kaim, M.; Folman, Y.; Meidan, Rina

doi:10.1016/s0739-7240(01)00127-8

Cited by 66 publications

(48 citation statements)

References 32 publications

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“…It seems that the follicular thecal cells are more sensitive to thermal stress than granulosa cells. Thecal cells collected from HS cows and incubated in vitro produce less androstenedione [30]. Similar findings have been reported for thecal cells cultured at high temperatures and stimulated by LH [28].…”

Section: Effects Of Hssupporting

confidence: 86%

“…Studies include ultrasonographic monitoring of follicular growth, oocyte collection using ovum pick-up procedure, and follicular-fluid aspiration by transvaginal aspiration probe [29]. In vitro models include (1) isolation of follicular theca and granulosa cells from cooled and HS cows [28]; (2) isolation of theca and granulosa cells obtained from dominant follicles in different seasons [30]; and (3) exposing oocytes to physiologically relevant heat shock in vitro to examine their developmental competence [31,32]. The last model is performed in the winter to avoid any involvement of previous thermal stress.…”

Section: Models To Study the Immediate And Carryover Effects Of Thermmentioning

confidence: 99%

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Comparing the effects of heat stress and mastitis on ovarian function in lactating cows: basic and applied aspects

Roth

Wolfenson

2016

Domestic Animal Endocrinology

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Section: Effects Of Hssupporting

confidence: 86%

Section: Models To Study the Immediate And Carryover Effects Of Thermmentioning

confidence: 99%

Comparing the effects of heat stress and mastitis on ovarian function in lactating cows: basic and applied aspects

Roth

Wolfenson

2016

Domestic Animal Endocrinology

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“…The divergence among these findings from the fact that most short-term, acute experiments did not reproduce the responses obtained in long-term, chronic, seasonal studies. In another study, plasma progesterone levels were significantly higher in winter compared to summer in Holstein cows at 60 to 80 days postpartum (Wolfenson et al 2002). No effects of milk yield or parity were detected.…”

Section: Discussionmentioning

confidence: 88%

Effects of season on plasma progesterone profiles in repeat breeding cows

Ghanem¹,

Nishibori²

2015

Vet. Med. - Czech

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Forty six Holstein Friesian repeat breeding cows (the average AI/conception was 5.2 ± 0.2) were investigated using the progesterone assay after AI to determine possible differences in plasma progesterone profiles between summer and winter seasons. Twenty eight (60.9%) and 18 (39.1%) cows were followed in summer (June-August) and winter (December-February), respectively. In the summer season, the total progesterone concentrations were higher (P < 0.05) in pregnant cows with normal luteal function compared to those in non-pregnant animals with abnormal luteal function. In contrast, in the winter season, there was no difference (P = 0.12) in total progesterone concentrations between pregnant and non-pregnant cows with normal or abnormal luteal functions. When the progesterone concentrations were compared, the pregnant and non-pregnant cows with normal luteal functions exhibited no difference (P = 0.92) in summer and winter seasons. Thus, the present study indicates that there is no effect of season on plasma progesterone profiles in repeat breeding cows; however in the summer season, the total progesterone concentrations were considerably higher in pregnant cows with normal luteal function compared to non-pregnant cows with abnormal luteal function.

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“…Intraovarian diffusion of progesterone from neighbouring CL throughout folliculogenesis is thought to influence the developmental competence of oocytes and may alter FF levels of progesterone. Nonetheless, seasonal reductions in the ability of granulosa cells to synthesize progesterone in vitro have been observed in pigs and cattle (Ledwitz‐Rigby and Rigby 1987; Wolfenson et al. 2002).…”

Section: Discussionmentioning

confidence: 99%

Follicular Progesterone Levels Decrease During the Period of Seasonal Infertility in Sows

Bertoldo

Holyoake

Evans

et al. 2010

Reprod Domestic Animals

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Impaired reproductive performance exhibited by the domestic sow during the late summer and early autumn months is referred to as seasonal infertility. This study was carried out to determine whether there are changes in ovarian morphology and follicular steroidogenesis associated with season, which may be associated with seasonal infertility. Ovaries were collected in pairs from sows sourced from two farms and slaughtered 4 days after weaning during winter and summer. The mean progesterone concentration in follicular fluid (FF) collected from small follicles was lower in summer (701.3 ± 115.54 nm) compared with winter (1235.55 ± 164.47 nm; p<0.001). The mean progesterone concentration in the FF of large follicles was also lower in summer (1469.2 ± 156.51 nm) compared with winter (2470.9 ± 169.13 nm; p<0.001). The number of large surface antral follicles (5-8 mm in diameter) on the ovaries recovered from Farm A sows was higher during summer (17.76 ± 0.56) than in winter (15.38 ± 0.54; p<0.05). Similarly, the number of small follicles (3-4 mm in diameter) on Farm A sow ovaries was higher in summer (8.46 ± 0.66) than in winter (4.63 ± 0.53; p<0.001). In contrast, the number of small follicles on the surface of ovaries recovered from Farm B sows was higher during winter (10.17 ± 1.50) than in summer (6.45 ± 1.00; p<0.01). The number of pre-ovulatory follicles (>8 mm in diameter) was also higher in winter (1.23 ± 1.68) when compared to summer (0.51 ± 0.3; p<0.001) on the ovaries of sows from Farm B. The results suggest that there are seasonal differences in follicular steroidogenesis and ovarian dynamics. These findings add support to the theory that altered follicular steroidogenesis and ovarian morphology may possibly be the mechanism behind reduced reproductive performance during the period of seasonal infertility in sows.

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Seasonal differences in progesterone production by luteinized bovine thecal and granulosa cells

Cited by 66 publications

References 32 publications

Comparing the effects of heat stress and mastitis on ovarian function in lactating cows: basic and applied aspects

Comparing the effects of heat stress and mastitis on ovarian function in lactating cows: basic and applied aspects

Effects of season on plasma progesterone profiles in repeat breeding cows

Follicular Progesterone Levels Decrease During the Period of Seasonal Infertility in Sows

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