A note on the effects of changing the concentration of protein in the diet offered to fattening beef cattle
Kay, M.; Macdearmid, A.
Animal Production 16(2): 205-207
ISSN/ISBN: 0003-3561 DOI: 10.1017/s0003356100030026
In 2 trials 40 and 72 British Friesian bullocks were weaned early and given a feed with 17% protein to 100 kg. From that weight they were fattened to 350 kg in the first trial and 400 kg in the second. Protein contents of the pelleted diets were changed at 250 kg. The diets were based on barley and soya bean meal. In the first trial protein contents for 4 groups were 17.5 then 14.5%, 14.5 then 11.5%, 14.5 then 9.5% or 11.5 then 9.5%. The bullocks in the last group ate less than the others up to 250 kg and gained 0.96 kg daily, against 1.32, 1.16 and 1.16 kg for the other groups.