1. Kuchel, R.E., and R.A. Buckley, 1969, Aust. J. Agric. Res. 20: 1099–1107.
2. Anon., 1974, Rural Research 86: 19–23.
3. Wilkins, J.F., and B.A. Hamilton, 1980, Aust. Vet. J. 56: 87–89.
4. Hunter, R.A., D.W. Peter, D.R. Hudson, and B.S. Chandler, 1981, Aust, J. Agric. Res. (in press).
5. Hudson, D.R., Hunter, R.A., and D.W. Peter, 1981, Aust. J. Agric. Res. (in press).