Abnormalities of foetal fluids in sheep: two case reports
1993
Wintour, E.M. | McFarlane, A. (Melbourne Univ., Parkville (Australia). Howard Florey Inst. of Experimental Physiology and Medicine)
In the first case, a ewe, at 64 days of pregnancy, had 2 sacs of fluid, one at each of the tips of the pregnant and non-pregnant horns. Neither sac contained a foetus. The composition of the fluids differed from those of the amniotic and allantoic fluids associated with a single foetus. The composition resembled that of foetal plasma. It was concluded that the 2 sacs were amniotic sacs from conceptuses that had been resorbed, and that at this early (0.4) stage of pregnancy, amniotic fluid can accumulate in the absence of a viable foetus. The second case was a rare case of hydrallantois in a ewe at 100 days of pregnancy. The volume of allantoic fluid (1800 mL) was more than 10 times normal. The composition was normal, except for high chloride and calcium concentrations and very low creatinine concentration. The foetus and the volume and composition of the amniotic fluid were normal. The hydrallantois might have occurred as a result of some alteration in function of the allantoic membrane, perhaps as a result of altered hormonal status of the ewe.
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