Nonstructural Carbohydrate and Protein Effects on Rumen Fermentation, Nutrient Flow, and Performance of Dairy Cows

J. M. Aldrich, L. D. Muller, G. A. Varga, L. C. Griel

Research output: Contribution to journalArticlepeer-review

136 Scopus citations

Abstract

Four multiparous Holstein cows fitted with rumen and duodenal cannulas were used in a 4 × 4 Latin square with 20-d periods. Four diets were formulated for high and low rumen availabilities of nonstructural carbohydrate and protein. Cows were milked and fed three times daily. Milk production averaged 39 kg/d and was unaffected by treatment. Dry matter intake and 4% FCM production were increased by 1 kg/d for cows fed the low rumen-available nonstructural carbohydrate diets. Milk protein percentage was elevated when either the high rumen-available nonstructural carbohydrate or high rumen-available protein diets were fed. Low rumen-available protein diets increased duodenal passage of total essential AA but did not increase passage of Arg, Ile, and Met. Passage of bacterial N was highest (262 g/d) when high rumen-available nonstructural carbohydrate was combined with high rumen-available protein and was lowest when high rumen-available nonstructural carbohydrate was combined with low rumen-available protein (214 g/d). Diets with low rumen availabilities of protein were not advantageous, possibly because duodenal passage of one or more of the limiting AA was not increased. Passage of bacterial N to the duodenum was highest when rumen availabilities of both nonstructural carbohydrate and protein were high.

Original languageEnglish (US)
Pages (from-to)1091-1105
Number of pages15
JournalJournal of dairy science
Volume76
Issue number4
DOIs
StatePublished - 1993

All Science Journal Classification (ASJC) codes

  • Food Science
  • Animal Science and Zoology
  • Genetics

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