THE PO2, PCO2, pH AND OXYGEN CONTENT OF OVARIAN VENOUS BLOOD OF SHEEP

Baird, D. T.; Giles, M.; Cockburn, F.

doi:10.1677/joe.0.0570405

Cited by 9 publications

(5 citation statements)

References 17 publications

(28 reference statements)

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“…Similarly, the morphological studies by Lee & O'Shea (1976) indicated the presence of AV shunts situated in the ovarian pedicle close to the ovary but their relative number remains un¬ known. The 02 partial pressure and content differ slightly in ovarian arterial and venous blood of sheep (Baird et al 1973), providing further cir¬ cumstantial evidence to suggest that a proportion of ovarian arterial supply may bypass the ovarian capillary beds.…”

mentioning

confidence: 77%

Blood flow in the ovary and adjacent structures of the non-pregnant sheep

Janson¹,

Williams²,

Petrucco³

et al. 1983

Acta Endocrinologica

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Blood flow to the ovary, vascular pedicle and oviduct was measured in anaesthetized non-cycling and cycling ewes by timed collection of ovarian venous blood. The degree of arterio-venous shunting across the ovary and pedicle was estimated both in vivo and in vitro by perfusing the tissues with 15 \m=+-\5 \g=m\mradioactive micro\x=req-\ spheres.The mean ovarian blood flow in non-cycling animals was 1.9 ml/min, which was 51% of blood flow in the ovarian vein. In cycling animals ovarian blood flow at midcycle was 2.9 ml/min (66% of ovarian venous flow) in non\x=req-\ luteal ovaries and 4.3 ml/min (79% of venous flow) in luteal ovaries. The degree of arterio-venous shunting was low in all stages of the cycle (1.0\p=n-\2.6% across ovary + pedicle). The degree of shunting was also found to be very small in vitro (0.007\p=n-\1.38%) in both non-luteal and luteal ovaries. A considerable number of microspheres was entrapped in the vascular pedicle of the ovary indicating the presence of an extensive capillary bed. There was an inverse relationship between blood flow in the ovary and flow in the vascular pedicle.Alterations in distribution of blood flow between the ovary and adjacent structures supplied by the ovarian artery may be of functional significance in allowing rapid changes in ovarian blood flow. The results of the present study indicate that changes in ovarian blood flow during the oestrous cycle are not caused by an action on arteriovenous shunt vessels.In the search for mechanisms underlying the uter¬ ine control of corpus luteum (CL) function of the ewe, much attention has been paid to the structure of ovarian blood vessels and the rates of blood flow

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confidence: 77%

Blood flow in the ovary and adjacent structures of the non-pregnant sheep

Janson¹,

Williams²,

Petrucco³

et al. 1983

Acta Endocrinologica

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“…In ewes, estimates of ovarian venous outflow (Mattner & Thorburn, 1969) were much greater than estimates of ovarian capillary blood flow obtained using rubidium chloride, iodoantipyrine or microspheres as tracers (Mattner, Hales & Brown, 1972;Brown, Hales & Mattner, 1974;Setchell & Linzell, 1974). Furthermore, in sheep (Baird, Giles & Cockburn, 1973) and in women (Fraser, Baird & Cockburn, 1973), the oxygen partial pressure and content differ only slightly in ovarian arterial and venous blood. While these findings provide circumstantial evidence to suggest that a significant proportion of the ovarian arterial supply may bypass the ovarian capillary beds in some species at least, results with perfusions of 15 pm diameter microspheres into ovarian arteries via the abdominal aorta in rabbits (Ahrén, Janson & Selstam, 1974) indicated that relatively little of the blood bypassed the ovarian capillary beds.…”

Section: Introductionmentioning

confidence: 90%

Evidence for functional arterio-venous anastomoses in the ovaries of sheep

Mattner¹,

Brown²,

Hales³

1981

Reproduction

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Vessels with histological features characteristic of arterio--venous anastomoses were found in the stroma but not in CL. In 5 conscious ewes at the mid-luteal stage of the oestrous cycle, ovarian blood flow was significantly greater (P less than 0.025) with microspheres of 50 than of 15 micrometers diameter in ovaries without CL (0.23 +/- 0.04 (s.e.m.) and 0.11 +/- 0.02 ml/min, respectively), but not in ovaries with CL (4.42 +/- 0.86 and 3.73 +/- 0.70 ml/min, respectively). In 5 similar but anaesthetized ewes, the portion of each ovarian artery within the ovarian vascular pedicle was bypassed with re-entrant catheters through which microspheres were perfused. A greater proportion (P less than 0.01) of 50 than of 15 micrometers microspheres was retained in ovaries with (90 and 79%) or without (82 and 45%) a CL. It is concluded that functional arterio--venous anastomoses are present in sheep ovaries.

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“…Since a significant fraction of the total ovarian blood flow may bypass the capillary bed (Baird et al, 1973), it has become imperative to obtain information on intraovarian capillary flow rates. Compartmental flow within the ovary has been determined by the injection of 46Sc-labelled microspheres (15 µ dia¬ meter) into the left ventricle of 23 sheep during the preovulatory period (Bruce & Moor, 1975).…”

Section: Intraovarian Capillary Blood Flowmentioning

confidence: 99%