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Methodical considerations when estimating nutrient digestibility in horses using the mobile bag technique.

N W Thorringer1, R B Jensen1

  • 1Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, NO-1433 Ås, Norway.

Animal : an International Journal of Animal Bioscience
|January 30, 2021
PubMed
Summary
This summary is machine-generated.

The mobile bag technique (MBT) can estimate dry matter and fiber digestibility in horses, similar to traditional methods. However, ash and crude protein digestibility may be overestimated, and feed surface area ratios require careful consideration.

Keywords:
Degradation profilesEffective degradabilityHindgutIn-situTotal faeces collection

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Area of Science:

  • Animal Nutrition
  • Digestive Physiology
  • Equine Science

Background:

  • Apparent total tract digestibility (ATTD) in horses typically requires total fecal collection, limiting individual feedstuff evaluation and segment-specific analysis.
  • The mobile bag technique (MBT) offers potential for assessing individual feedstuffs and gastrointestinal tract (GIT) segment degradation, but requires methodological validation in horses.

Purpose of the Study:

  • To evaluate the mobile bag technique (MBT) in horses by comparing its results with apparent total tract digestibility (ATTD) for hay.
  • To investigate the influence of bag size and feed-to-surface area (FSA) ratio on nutrient disappearance and degradation kinetics using MBT in horses.

Main Methods:

  • Five cecum-cannulated horses were fed a hay-only diet, with total fecal collection over four days.
  • Mobile bags of varying sizes and feed-to-surface area (FSA) ratios were incubated in the horses' digestive tracts.
  • Dry matter (DM) disappearance, transit time (TT), effective degradability (ED), and degradation (Dt) were measured and compared to ATTD values.

Main Results:

  • ATTD of DM, organic matter (OM), NDF, and ADF were predictable using MBT, but ash and crude protein (CP) were overestimated.
  • Transit time (TT) averaged 29.2 hours; effective degradability (ED) was underestimated using a mean retention time of 30 hours, while degradation (Dt) reflected DM ATTD.
  • Bag size did not impact DM disappearance, but higher FSA ratios (>20 mg/cm²) negatively affected degradation kinetics.

Conclusions:

  • The mobile bag technique (MBT) is suitable for estimating the degradability of DM, OM, and fiber in horses, aligning with ATTD.
  • Careful management of the feed-to-surface area (FSA) ratio is crucial, keeping it below 20 mg/cm² to ensure accurate degradation kinetic assessments.
  • MBT provides valuable insights into feedstuff degradation within the equine gastrointestinal tract, complementing traditional digestibility measurements.