The use of coarsely chopped barley straw in high concentrate diets for beef cattle

Abstract

An experiment was carried out in which the performance of cattle given diets containing 20 and 40 % of coarsely chopped straw (1-3 in lengths) was compared with that of similar cattle given an all-concentrate diet. Each diet was offered ad libitum and twelve Hereford cross steers and twelve Friesian steers were used in the experiment. The live-weight gains and food conversion ratios were significantly better for the Hereford cross animals but there was no significant difference in over-all dry matter intakes. When the combined response of both breed types was considered there was a significantly linear decrease in live-weight gain with increasing straw intake, to the extent of 0-95 kg per week for each 10% increase in straw intake up to 40% in the diet. Similarly there was a significant increase in the conversion ratios of dry matter (P < 0-001) and organic matter (P < 0-01) with increasing straw intake. The effect on the dry matter conversion ratio was an increase of 1-67 units for each 10 % increase in straw intake.Two digestibility trials were carried out, one with coarsely chopped straw and one with coarsely milled straw, the levels of straw in the diets being the same. There was a slight decline in the digestibility of most constituents associated with milling but reductions were not very pronounced. A treatment was included in the second trial in which milled straw was included at 20 % of the diet without maintaining the over-all crude protein content of the diet. The apparent digestibility of the organic matter was 5 percentage units lower with this treatment than with that containing the same level of straw in which the level of protein had been maintained.

Ground and pelleted straw and hay for fattening Israeli-Friesian male calves

“…This is in agreement with and Forbes et al (1969), and in disagreement with Lamming et al (1966Lamming et al ( , 1967Lamming et al ( , 1969Lamming et al ( , 1970. This is in agreement with and Forbes et al (1969), and in disagreement with Lamming et al (1966Lamming et al ( , 1967Lamming et al ( , 1969Lamming et al ( , 1970.…”

“…Lamming, Swan and Clarke (1966), Lamming (1967,1970), and Pickard, Swan and Lamming (1969) have shown that substitution of up to 30% of the grain in a fattening ration by ground barley straw did not depress live-weight gain nor alter the performance in any other way. A decrease in the rate of gain was found by Kay, Macdearmid and MacLeod (1970) and by Forbes, Irwin and Raven (1969) with chopped straw, and by Kay, Macdearmid and Massie (1970) with ground straw, when 20 to 50% of the grain in a fattening ration was replaced by straw; a greater decrease was found when the straw was chopped rather than ground. A decrease in the rate of gain was found by Kay, Macdearmid and MacLeod (1970) and by Forbes, Irwin and Raven (1969) with chopped straw, and by Kay, Macdearmid and Massie (1970) with ground straw, when 20 to 50% of the grain in a fattening ration was replaced by straw; a greater decrease was found when the straw was chopped rather than ground.…”

Wheat Straw in Growing Cattle Diets

“…This finding agrees with a report by Forbes et al (1969) in which increasing levels of barley straw in cattle diets decreased average daily gain. As expected, cattle fed a diet of corn silage and soybean meal gained significantly faster and more efficiently than those fed wheat straw.…”