Effectiveness of complete pelleted mixture with different straw contents in intensive rearing and fattening of bull calves

Bogdanov, G.A.; Bulgakov, V.E.

Doklady Vsesoyuznoi Ordena Lenina Akademii Sel' skokhozyaistvennykh Nauk 9: 25-27


Accession: 000359074

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Simmental bulls 12 months old and initially weighing 295 kg in 3 groups were fattened on complete pelleted diets with straw 30, 40 or 50% by weight, maize, sunflower and soya bean oilmeal 39, 29 or 19% and equal amounts (for the 3 diets) of a mixture of maize, barley, wheat and peas, sunflower meal, beet molasses, urea to 32% of total N, minerals and additives. The diets supplied 0.68, 0.62 or 0.57 kg feed units (FU) and 68, 59 or 52 g digestible protein/kg. Average daily gains were 1381, 1259 and 1163 g and the cattle ate 5.2, 5.6 and 5.5 FU and 529, 544 and 5.5 g digestible protein/kg gained. The diet with 50% straw gave highest values for pH, cellulolytic activity, lowest for total N, protein and NH3 and total volatile fatty acids in rumen contents; molar proportions of acetic and butyric acids were most, that of propionic acid least. Carcass yield was 56.8, 54.4 and 53.5% and the ratio of meat to bone was 4.63, 3.93 and 4.08:1. The high-straw diet gave meat with lower tryptophan:hydroxyproline ratio, showing some reduction in the biological value of the protein.