Rumen Degradability of Barley, Oats, Sorghum, Triticale, and Wheat In Situ and the Effect of Pelleting

Liyi Pan, Kim H. Huang, Todd Middlebrook, Dagong Zhang, Wayne L. Bryden and Xiuhua Li
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Liyi Pan: School of Agriculture and Food Sciences, University of Queensland, Gatton, QLD 4343, Australia
Kim H. Huang: Weston Animal Nutrition, Braidwood St., Strathfield, NSW 3136, Australia
Todd Middlebrook: Weston Animal Nutrition, Braidwood St., Strathfield, NSW 3136, Australia
Dagong Zhang: School of Agriculture and Food Sciences, University of Queensland, Gatton, QLD 4343, Australia
Wayne L. Bryden: School of Agriculture and Food Sciences, University of Queensland, Gatton, QLD 4343, Australia
Xiuhua Li: School of Agriculture and Food Sciences, University of Queensland, Gatton, QLD 4343, Australia

Agriculture, 2021, vol. 11, issue 7, 1-9

Abstract: Feeding cereal grain to cattle is common practice for optimal beef and milk production. High concentrations of starch and other soluble carbohydrates may cause acidosis. Information on the effect of processing on starch and protein degradability in the rumen are scarce. This study was to determine the ruminal degradation patterns of common grains and the effect of steam pelleting on starch and crude protein (CP) degradability in the rumen. The ruminal degradation pattern of dry matter (DM), starch, and CP of ground and pelleted sorghum, barley, wheat, and samples along with ground oats and triticale were determined using the in situ nylon bags method. Cereals were incubated for 0, 2, 4, 6, 8, 16, 32, and 60 h, and the fast and slowly degradable fraction, the effective degradation rate, and effective degradability (ED) of DM, starch, and CP were calculated. The starch ED of ground and pelleted sorghum, barley, and two wheat samples were 57.3, 93.6, 95.2, and 97.2%; and 61.5, 93.8, 93.8, and 95.6%, and their crude protein ED was 54.8, 82.3, 83.3, 82.6% and 51.9, 79.2, 81.8, and 78.1% respectively. The starch ED of ground oat and triticale were 98.3 and 94.7%, and that of CP were 93.7 and 75.2%, respectively. The degradability of sorghum was significantly lower than that of the other grains. Pelleting increased the fast-degradable DM and starch faction of sorghum and tended to improve its DM degradability ( p = 0.081). Pelleting significantly reduced the fast-degradable fraction of DM and starch of wheat samples and numerically reduced its degradability.

Keywords: in situ; rumen; pelleting; degradability; cereal grains (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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