1. Variations in the live weight of dairy cows
2. The technique of weighing bullocks on summer grass
3. 4. J. T. Morgan, 1948 . The milk production, milk composition and certain other physiological characters of dairy cows in relation to winter feeding and a system of rotational grazing . M.Sc. Thesis , University of Wales.
4. 5. S. J. Watson, 1950 . Grassland and Grassland Products . London: Nelson, 1950 . pp.51 -53 .