1. Ahlquist, R.P., 1948. A study of the adrenotropic receptors. Am. J. Physiol., 153: 586.
2. Aitken, M.M. and Sanford, J., 1972. Modification of acute systemic anaphylaxis of cattle by drugs and by vagotomy. J. Comp. Pathol., 82: 247.
3. Aitken, M.M. and Sanford, J., 1975. Effects of prostaglandins in calves. Br. J. Pharmacol., 54: 266P.
4. Allen, N.M.S., Berrett, S., Harding, J.D.J. and Patterson, D.S.P., 1970. Experimentally induced acute stress syndrome in Pietrain pigs. Vet. Rec., 87: 64.
5. Allen, W.R., 1977. In: D.B. Caighton, N.B. Haynes, G.R. Foxcroft and G.E. Lamming (Eds), Control of Ovulation. Butterworths, London, Boston, Sydney, Wellington, Durban, Toronto, p. 453.