PMID: 11900966Mar 20, 2002Paper

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

Domestic Animal Endocrinology
D WolfensonR Meidan

Abstract

This study examined seasonal differences in progesterone (P4) production by granulosa cells (GC) and thecal cells (TC) that were luteinized in vitro during the winter or the summer; it also compared plasma P4 concentrations of lactating dairy cows in the two seasons. First-wave dominant follicles obtained from Holstein cows were dissected on day 6 of the cycle, GC and TC were separated, enzymatically dispersed, and cultured for 9 days in media containing 1% fetal calf serum, forskolin (10 micromol/mL) and insulin (2 microg/mL), to induce cell luteinization. All experimental procedures were identical and characteristics of the follicles were similar in the two seasons. During 9 days of culture, P4 production by luteinized GC was higher in winter than in summer, but the difference only tended to be significant. In contrast, luteinized TC produced three times as much P4 in winter as in summer (324 versus 100 ng/10(5)cells). In the in vivo experiment, P4 concentrations in plasma collected during entire estrous cycles in winter and summer were compared. The cows were, on average, at 70 days postpartum and yielded similar amounts of milk. Concentrations of progesterone in plasma were significantly higher in winter than in summer; dur...Continue Reading

References

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Citations

Nov 19, 2013·Tropical Animal Health and Production·Thaisa Campos MarquesRoberto Sartori
Nov 19, 2010·Reproduction in Domestic Animals = Zuchthygiene·M BertoldoC G Grupen
Jul 12, 2012·Reproduction, Fertility, and Development·M J BertoldoC G Grupen
Jul 6, 2020·Reproduction in Domestic Animals = Zuchthygiene·Zvi Roth
Oct 5, 2010·Reproduction, Fertility, and Development·M BertoldoC G Grupen
Aug 13, 2011·Reproductive Medicine and Biology·Masashi Takahashi
Nov 10, 2018·Animal Frontiers : the Review Magazine of Animal Agriculture·David Wolfenson, Zvi Roth
Oct 14, 2020·Reproduction in Domestic Animals = Zuchthygiene·Ioannis NanasGeorgios S Amiridis
Jul 23, 2021·Scientific Reports·Ramanathan Kasimanickam, Vanmathy Kasimanickam
Jul 30, 2021·Reproduction in Domestic Animals = Zuchthygiene·Ioannis NanasGeorgios S Amiridis
Aug 28, 2021·Animals : an Open Access Journal From MDPI·Isfendiyar DarbazSelim Aslan
Nov 16, 2021·Tropical Animal Health and Production·Merilio Montero-UrdanetaAntonio Landaeta-Hernández

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