Campling et al., 1966. Brit. J. Nutr., 20: 229-244 Document reference Campling, R. C. ; Freer, M., 1966. Factors affecting the voluntary intake of food by cows. 8. Experiments with ground, pelleted roughages. Br. J. Nutr., 20: 229-244Web https://doi.org/10.1079/BJN19660024Citation key Campling et al., 1966