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Update: dietary protein and microbial protein contribution.

C E Polan1

  • 1Department of Dairy Science, College of Agriculture and Life Sciences, Virginia Agricultural Experiment Station, Virginia Polytechnic Institute and State University, Blacksburg 24061-6999.

The Journal of Nutrition
|February 1, 1988
PubMed
Summary

Microbial protein synthesis in the rumen is influenced by dietary protein sources. Optimizing protein degradability, like with soybean meal, can enhance microbial growth and nutrient availability for livestock.

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Area of Science:

  • Ruminant nutrition
  • Animal science
  • Microbiology

Background:

  • Microbial protein synthesis is crucial for ruminant nutrition, with factors influencing it extensively studied.
  • Dietary nitrogen sources, including ammonia and intact proteins, significantly impact microbial and feed protein contributions postruminally.

Purpose of the Study:

  • To review and synthesize recent findings on factors affecting microbial protein synthesis in the rumen.
  • To analyze the impact of different dietary protein sources and their degradability on microbial growth and postruminal nutrient supply.

Main Methods:

  • Review of original publications from the past three years.
  • Analysis of studies reporting microbial and feed protein nitrogen contributions postruminally.
  • Evaluation of various dietary protein sources, including urea, soybean meal, and undegradable proteins.

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Main Results:

  • Ammonia supports microbial growth, but intact protein substitution often stimulates microbial protein production.
  • Soybean meal's degradability appears to optimize microbial growth in vivo.
  • Highly undegradable proteins may reduce microbial growth but can compensate by providing intact protein postruminally.

Conclusions:

  • Dietary protein source and degradability significantly influence microbial protein synthesis and postruminal amino acid availability.
  • Soybean meal may negatively impact microbial growth in specific diets (e.g., high protein grass silage).
  • Further research is needed to accurately predict the quantitative contributions of microbial and dietary protein postruminally.