PSII-5 Characterization of feeding behavior, ruminal motility, and rumen environment of beef heifers during a moderate transition to a 90% concentrate diet

Autor: James L. Klotz, Amanda M. Egert-McLean, Niels Bastian Kristensen, David L. Harmon
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Popis: The objective was to study the transition of beef cattle from a 70% to a 90% concentrate diet to increase understanding of mechanisms contributing to behavioral and physiological adaptations to a high-concentrate diet. Eight ruminally-cannulated Angus-cross heifers (BW=497 ± 24 kg) were adapted to a 70% concentrate diet (T70) fed ad libitum once daily. Baseline measurements were taken for 2 days and averaged. Then, heifers were switched to a 90% concentrate diet (H90), and responses were measured and averaged by animal and day or hour. Data were analyzed using PROC MIXED of SAS with repeated measures. Ruminal pH was below 5.6 for longer on both days of the H90 diet than during T70 feeding (P
Databáze: OpenAIRE