1. BRAMBELL, F. W. R. (1970). The Transmission of Passive Immunity from Mother to Young. Amsterdam: North Holland.
2. CHATWIN, A. L., LINzELL, J. L. & SETCHELL, B. P. (1969). Cardiovascular changes during lactation in the rat. J. Endoer. 44, 247-254.
3. CLAUDE, P. & GOODENOUGH, D. A. (1973). Fracture faces of zonulae occludentes from 'tight' and 'leaky' epithelia. J. cell Biol. 58, 390-400.
4. COWIE, A. T. & TINDALL, J. S. (1971). The Physiology of Lactation. London: Arnold.
5. FLEET, I. R. & LINZELL, J. L. (1964). A rapid method of estimating fat in very small quantities of milk. J. Physiol. 175, 15-17 P.