1. Meschia G, Cotter J, Makowski E, Barron D (1966) Simultaneous measurement of uterine and umbilical blood flows and oxygen uptakes. Q J Exp Physiol 52:1–18
2. Clark KE, Mack C, Khoury J (1990) Effects of chronic instrumentation on fetal growth. J Dev Physiol 14:343–347
3. Bessette NW, Rurak DW (2010) Chronic fetal and maternal instrumentation in pregnant sheep: effect on gestation length and birth weight. Reprod Fertil Dev 22:459–467
4. Dawes GS, Fox HE, Leduc BM, Liggins GC, Richards RT (1972) Respiratory movements and rapid eye movement sleep in the foetal lamb. J Physiol 220:119–143
5. Ruckebusch Y, Gaujoux M, Eghbali B (1977) Sleep cycles and kinesis in the foetal lamb. Electroencephalogr Clin Neurophysiol 42: 226–237