Abstract
Extract The Sheep has been used extensively as a model for maternal, foetal and neonatal research (Assali et al., 1974 Assali, N. S. , Brinkman, C. R. III and Nuwayhid, B. 1974. Comparison of maternal and fetal cardiovascular functions in acute and chronic experiments in sheep. Am. J. Obstet. Gynec, 120: 411–425. [Google Scholar] ) and for investigating alterations in blood constituents that occur at the time of parturition (Comline and Silver, 1972 Comline, R. S. and Silver, M. 1972. The composition of foetal and maternal blood during parturition in the ewe. J. Physiol., Lond., 222: 233–256. [Google Scholar] ).