Effect of steam flaking with different process conditions on dry matter and crude protein degradability of barley grain in Holstein cows

Document Type : Research Paper

Authors

1 PhD student, Department of Animal science, Faculty of Agricultural, university of Tehran, Tehran, Iran

2 Professor, Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran

3 Professor, Department of Animal Science, Faculty of Agriculture, University of Tehran, Tehran, Iran

4 Associate Professor, Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran

5 Assistant Professor, Department of Animal Science, Faculty of Agriculture, University of Urmia, Urmia, Iran

Abstract

Effects of different processing conditions in steam flaking was examined on the dry matter and crude protein degradability of barley grain in Holstein cows. This study was conducted as a factorial experiment in completely randomized design. Two levels of pressure (3 and 5 Bar), 3 levels of heating temperature (75, 90 and 105 centigrade), and three levels of the roll interspaces (low, medium and high) were used. In situ ruminal degradability was measured using three ruminally fistulated Holstein cows.Dry matter and crude protein degradability of processed materials were significantly decreased by steam flaking compared with untreated barley (P<0.05). Rumen degradability of dry matter and crude protein were decreased by increasing heat, pressure and decreasing space between rolls (P<0.05). The amount of immediately degraded fraction (a) of dry matter and crude protein of treated barley were decreased by steam flaking, compared with untreated barley. Significant reduction of potentially degradable fraction (b) in dry matter and crude protein were observed in treated barley (P<0.05). Additionally, increased pressure and heat and reduced roll interspace decreased effective degradability (P<0.05).According to reducing effects of steam flaking on the degradability of dry matter and crude protein, high degradability of barley grain and acidosis can be alleviated by steam flaking.

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References

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Animal Production Research
Volume 6, Issue 4
January 2018
Pages 55-67

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