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- W2103460401 abstract "In order to establish appropriate culture temperatures for in-vitro maturation of pig ovarian oocytes, large Graafian follicles (7-10 mm diameter) were sensed by infra-red technology during the latter part of a spontaneous oestrous cycle. Temperatures were measured under systemic anaesthesia almost instantaneously upon revealing the ovaries at mid-ventral laparotomy. Temperature differentials were observed within all 16 ovaries sensed in 14 animals. Ovaries were always cooler than deep rectal temperatures (mean rectal temperature was 38.0 +/- 0.4 degrees C; range 37.5-38.6 degrees C) and mature follicles always cooler than ovarian stroma (35.6 +/- 0.3 degrees C versus 37.3 +/- 0.2 degrees C respectively; P < 0.01). Such follicles were frequently 1.5-1.8 degrees C cooler than the adjacent stroma, the mean being 1.7 +/- 0.4 degrees C. Small Graafian follicles (< 5-6 mm diameter) and recent ovulations did not show this differential. The control experiment of excising an ovary, deep freezing it in liquid nitrogen, and then restoring it to the body cavity before further sensing indicated that intra-ovarian temperature gradients depended on the activity of living tissues and/or a functional blood supply. Furthermore, calculation of anticipated rates of cooling for exposed Graafian follicles strongly suggested that artefacts could not have been solely responsible for the observed temperatures. Endothermic reactions within mature follicles were thus brought into focus. It is concluded that follicular temperatures may influence the meiotic progression and cytoplasmic maturation of oocytes and act to regulate enzymatic activity in the biosynthetic pathways for steroid and/or peptide hormones." @default.
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- W2103460401 date "1997-01-01" @default.
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- W2103460401 title "Graafian follicles are cooler than neighbouring ovarian tissues and deep rectal temperatures" @default.
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- W2103460401 doi "https://doi.org/10.1093/humrep/12.1.95" @default.
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