The effects of feeding intensity and protein source on growth, feed intake, slaughter and body measurements of 24 pre-pubertal Finnish Ayrshire heifers were studied. The heifers were fed a hay-barley diet supplemented with either urea or rapeseed meal (RSM). The treatments were: (1) LU, low feeding level+urea; (2) LR, low feeding level+RSM; (3) HU, high feeding level+urea; (4) HR, high feeding level+RSM. Hay was fedad libitumon HU and HR diets but was restricted on LU and LR diets. The average initial weight of the heifers was 87 kg, and the final weight 220 kg.