Changes in the buffering capacity of diets with 27% or 37% NDF during in vitro ruminal digestion

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GERMÁN DAVID MENDOZA MARTÍNEZ
MARÍA ESTHER ORTEGA CERILLA
LUIS ALBERTO MIRANDA ROMERO
JUAN MANUEL PINOS RODRÍGUEZ
RICARDO BÁRCENA GAMA
SERGIO SEGUNDO GONZÁLEZ MUÑOZ

Abstract

CHANGES IN THE BUFFERING CAPACITY OF TWO DIETS DIFFERING IN NEUTRAL DETERGENT FIBER LEVEL (NDF, 27% AND 37%) WERE EVALUATED DURING IN VITRO DIGESTION AS WELL AS FOR RUMINATION TIME INDUCED BY EACH DIET. BUFFERING CAPACITY (MEQ HCL/G OF DM/PH) WAS MEASURED IN COMPLETE DIETS AND IN THE IN VITRO DIGESTION RESIDUES AFTER 3, 6, 9, 12, 24 AND 48 HOURS. RUMINATION TIME WAS EVALUATED IN SIX HOLSTEIN HEIFERS (300 ± 17 KG BW). THE DIET CONTAINING 37% NDF HAD A HIGHER (P < 0.05) BUFFERING CAPACITY (204 MEQ HCL/G OF DM/PH) THAN THE DIET CONTAINING 27% NDF (147 MEQ HCL/G OF DM/PH) BEFORE INCUBATION AND AFTER THREE (699 VS. 458) AND SIX (639 VS. 416) HOURS OF INCUBATION. RUMINATION TIME WAS LONGER (P < 0.05) IN HEIFERS FED WITH THE DIET CONTAINING 37% NDF (210 MIN/12 H) THAN WITH THE DIET CONTAINING 27% NDF (161 MIN/12 H). DIETARY NDF LEVEL HAS TWO EFFECTS ON BUFFERING CAPACITY; ITS INTRINSIC BUFFERING PROPERTIES DURING THE FIRST HOURS OF DIGESTION AND AN INDIRECT EFFECT BY STIMULATING RUMINATION.
Keywords:
BUFFERING CAPACITY DAIRY CATTLE NEUTRAL DETERGENT FIBER RUMINAL PH RUMINATION

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