1. Allden, W. G. (1970). The effects of nutritional deprivation on the subsequent productivity of sheep and cattle, Nutr. Abstr. Rev., 40, 1167–84
2. Braden, A. W. H. and Moule, G. R. (1964). Effects of stress on ovarian morphology and oestrous cycles in ewes, Aust. J. agric. Res., 15, 937–49
3. Casida, L. E. (1963). The level of fertility in the female as influenced by feed level and energy intake, Proc. 6th int. Congr. Nutr. Edinb., 366–75
4. Cedillo, R.-M., Hohenboken, W. and Drummond, J. (1977). Genetic and environmental effects on age at first oestrus and on wool and lamb production of crossbred ewe lambs, J. Anim. Sci., 44, 948–57
5. Clark, R. T. (1934). Studies on the physiology of reproduction in sheep. 1. The ovulation rate of the ewe as affected by the plane of nutrition, Anat. Rec., 60, 125–34