Predicting in vivo starch digestibility coefficients in newly weaned piglets from in vitro assessment of diets using multivariate analysis.
The study was based on correlating a dataset of in vivo mean starch digestibility coefficients obtained in the immediate post-weaning phase of piglets with a range of dietary in vitro variables. The paper presents a model that predicts (R2 0.71) in vivo average starch digestibility coefficients in the 0.5 small-intestinal region of newly weaned piglets fed cereal-based diets using seven in vitro variables describing starch properties that are fundamentally associated with the quality of feed materials, i.e. hydration, structure and amylolytic digestion. The variables were: Rapid Visco Analyser (RVA; measures the viscosity of materials when sheared under defined hydration and temperature regimens); RVA end viscosity; RVA (gelatinisation) peak viscosity; DeltaH (gelatinisation enthalpy that provides an estimate of helical order or degree of crystallinity in starch); water solubility index (WSI; that denotes the amount of soluble polysaccharides released from starch granules to the aqueous phase); grain endogenous amylase (concentration of endogenous alpha-amylase in cereals, assessed by pasting cereal flours in 25 g of AgNO3, an amylase inhibitor v. water using RVA).
Doucet
Frederic J
FJ
University of Nottingham, Loughborough, Leicestershire, LE12 5RD, UK. fdoucet@geoscience.org.za
White
Gavin A
GA
Wulfert
Florian
F
Hill
Sandra E
SE
Wiseman
Julian
J
D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D004032:Diet / Q000662:veterinary*; D004040:Dietary Carbohydrates; D004063:Digestion / Q000502:physiology*; D004734:Energy Metabolism; D008297:Male; D015999:Multivariate Analysis; D025341:Principal Component Analysis; D013213:Starch / Q000378:metabolism*; D013552:Swine; D014886:Weaning
D004040:Dietary Carbohydrates; D013213:Starch