Fat digestibility in Equus caballus follows increasing first-order kinetics

Journal of Animal Science
D S KronfeldP A Harris

Abstract

The digestibility of ether extract varies greatly from forages to grains and further to added fats consisting mainly of triglycerides. This variation has been attributed to two main factors, the presence of nonhydrolyzable substances in the ether extract, especially in leafy foods, and the dilution of endogenous fecal fat. A compilation of results from 188 equine digestion balance observations on five basal feeds and 18 test feeds with added fats demonstrated a true digestibility of fat approaching 100% and an endogenous fecal fat of 0.22 g x d(-1) x kg BW(-1). The results revealed that nonhydrolyzable ether extract and endogenous fecal fat were insufficient to account for the difference between true digestibility and apparent digestibilities of ether extract in basal feeds and partial digestibilities of added fats in test feeds. A third possible contributing factor was demonstrated: an increasing first-order relationship between observed digestibilities (D, %) and the fat content of the feed (F, g/kg): D = 92.0 - 92.0e(-F/342). r2 = 0.81, P < 0.001. This equation indicates that 46% digestibility (half maximum) occurs at an ether extract or fat content of 24 g/kg, which is common in forages. It is consistent with fat digestibil...Continue Reading

References

Mar 1, 1977·The British Journal of Nutrition·J KowalczykC S Stewart
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Citations

Jul 25, 2020·Translational Animal Science·Laura K FehlbergTeresa L Douthit
Nov 20, 2015·Animal Science Journal = Nihon Chikusan Gakkaihō·Kazeem Dauda AdeyemiAzad Behnan Sabow
Oct 6, 2007·American Journal of Veterinary Research·Mireia Lorenzo-FiguerasAlfred M Merritt
Jun 2, 2009·The Veterinary Record·S Van WeyenbergG P J Janssens
Apr 7, 2021·The Veterinary Clinics of North America. Equine Practice·Patricia Harris, Megan Shepherd
Apr 7, 2021·The Veterinary Clinics of North America. Equine Practice·Kristine L Urschel, Erica C McKenzie
Apr 7, 2021·The Veterinary Clinics of North America. Equine Practice·Morgane RoblesPascale Chavatte-Palmer

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