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Determination of reticulo-rumen and whole-stomach digestion in lactating cows by omasal canal or duodenal sampling

  • Seppo Ahvenjärvi (a1), Aila Vanhatalo (a1), Pekka Huhtanen (a1) and Tuomo Varvikko (a1)

Abstract

Four ruminally and duodenally cannulated multiparous Finnish Ayrshire cows were fed on diets consisting of grass silage (0·6 kg/kg DM) and one of four concentrates: barley, barley + urea, barley + rapeseed meal and barley + rapeseed cake. The objective of the present study was to compare omasal canal and duodenal digesta flows. Values for digesta flow into the omasal canal and duodenum were determined using a triple-marker method based on Co-EDTA, Yb-acetate and indigestible neutral-detergent fibre (NDF) markers. Microbial non-NH3 N (NAN) flow was assessed by purine flow. Microbial samples to determine the bacterial purine: N ratio were harvested from the rumen, omasum and duodenum. Organic matter flow was significantly lower into the omasum than the duodenum, indicating an endogenous organic matter secretion into the abomasum. In contrast, NDF and acid-detergent fibre flows were significantly higher into the omasum indicating digestion of fibre in the omasum. Microbial NAN flows were significantly different (P < 0·001) when estimates were based on bacterial samples harvested from different sites. Differences in total NAN, microbial NAN and dietary NAN flows entering the omasal canal and duodenum were non-significant. The results indicated that the omasal sampling technique provides a promising alternative to the duodenal sampling technique to investigate forestomach digestion in dairy cows and offers an alternative means to study rumen N metabolism.

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Corresponding author

*Corresponding author: Seppo Ahvenjärvi, fax +358 3 4188 3661, email seppo.ahvenjarvi@mtt.fi

References

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Keywords

Determination of reticulo-rumen and whole-stomach digestion in lactating cows by omasal canal or duodenal sampling

  • Seppo Ahvenjärvi (a1), Aila Vanhatalo (a1), Pekka Huhtanen (a1) and Tuomo Varvikko (a1)

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