Quantifying ruminal digestion of organic matter and neutral detergent fiber using the omasal sampling technique in cattle--a meta-analysis

Journal of Dairy Science
P HuhtanenK J Shingfield

Abstract

A data set from 32 studies (122 diets) was used to evaluate the accuracy and precision of the omasal sampling technique by investigating the relationships between ruminal and total digestion of neutral detergent fiber (NDF), between intake and apparent and true ruminal digestion of organic matter (OM), and between omasal NAN flow and milk protein yield. A mixed model regression analysis with random study effect was used to evaluate the relationships. The data were obtained when feeding North American diets (n=36) based on alfalfa silage, corn silage, and corn grain and North European diets (n=86) comprising grass silage supplemented with barley-based concentrates. In all studies, digesta flow was quantified using a triple-marker approach. Standard deviations of ruminal NDF and true OM digestibility were smaller than typically reported in duodenal sampling studies using only chromic oxide as a flow marker. The relationship between total and ruminal NDF digestion was consistent, indicating little variation in the proportion of total-tract NDF digestion that occurred in the rumen. Furthermore, the slope of this regression indicated that 94.7% (+/-2.7%) of total NDF digestion occurred in the rumen. The slopes of mixed model regress...Continue Reading

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Citations

Mar 23, 2012·Animal : an International Journal of Animal Bioscience·S J KrizsanS Colombini
Apr 18, 2016·Journal of Dairy Science·P HuhtanenS J Krizsan
Nov 26, 2013·Journal of Dairy Science·S GhimireM D Hanigan
Oct 7, 2015·Journal of Animal Science·R F LeiteP Huhtanen
Apr 30, 2019·Journal of Dairy Science·A N HristovZ Yu
Dec 20, 2018·Animal : an International Journal of Animal Bioscience·M R F LeeA Marshall
Mar 10, 2021·Tropical Animal Health and Production·Lara Maria Santos BrantJosé Esler de Freitas Júnior

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