Effects of dietary protein and energy on the growth of Friesian hull calves

摘要: Abstract Results are reported from an experiment examining the effects on growth of pre-ruminant calf diets containing a range protein: energy ratios fed at two rates. Groups three Friesian bull calves were allocated to each six milk-based rations either 15.7, 18.1, 21.8, 25.4, 29.6, or 31.5% protein dry matter basis and adequate for rates 830 gjday. The same diets, except 29.6% ratio, also five groups receiving intakes sufficient 610 g/day, comparative slaughter procedure was used assess treatment after 49-day trial period. Both feeding levels markedly affected gains body weight, protein, fat, but by dietary content only low level. Estimated digestible requirements maximum weight 166 ± 13 gjday 236 19 high respectively we...