Interaction between barley grain processing and source of dietary nitrogen on digestibility, nitrogen metabolism and microbial protein synthesis in Mehraban sheep

Document Type : Research Paper

Authors

1 MSc graduated student, Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

2 Associate professor, Animal Science Department, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

3 Assistant professor, Animal Science Department, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

4 Professor, Animal Science Department, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

Abstract

In order to evaluate the effect of barley grain processing and dietary nitrogen source on digestibility, microbial protein synthesis and nitrogen retention in sheep, an experiment was conducted as 2×2 factorial under a completely randomized design. The experimental diets included 1) whole barley grain + urea, 2) whole barley grain + soybean meal, 3) cracked barley grain + urea and 4) cracked barley grain + soybean meal. During the digestibility experiment, total urine of sheep was collected, and blood samples were taken at 1 and 7 hours after morning feeding at the last day. Results showed that barley grain processing decreased dry matter digestibility (from 73.82 to 71.58 percent) and organic matter digestibility (from 74.94 to 72.84 percent) of diet (P<0.05). Soybean meal intake compared to urea, increased crude fiber digestibility (from 29.97 to 32.84 percent) and nitrogen free extract digestibility (from 81.39 to 82.13 percent) of diet (P<0.05). Soybean meal compared to urea, increased nitrogen retention percentage from 19.64 to 37.92 percent of nitrogen intake (P<0.05). But barley grain processing had no effect. Also, concentration of plasma glucose and urea were not affected by barley grain processing and nitrogen source. Generally, barley grain cracking did not increase nutrient digestibility, nitrogen retention and microbial protein synthesis. But soybean meal intake compared to urea improved nutrient digestion (included crude fiber and nitrogen free extract) and nitrogen retention.

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References

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Animal Production Research
Volume 6, Issue 1
June 2017
Pages 39-51

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