Vie CONG. INTERN. REPROD. ANIM. INSEM. ARTIF., PARIS, 1968, VOL. II

the recovery times }s unnecessarily complicated for routine
purposes. An electonic clock is now being developed for this
purpose.

This technique is the subject of U.K. Patent Application

No: 19741/68 the rights in which have been assigned to the

N.R.D.C.

e Bishop, M.W.H., Campbell R.C., Hancock, J.L & Walton A.
Je. Agric. Sei. 44 227 195k.

2. Walton, A. J. Exp. Biol. 29 520, 1952.

B Rothschild, Lord. J. Exp. Biol. 30 178 1953.