049 Physiological and molecular mechanisms associated with performance, immunometabolic status, and liver function in transition dairy cows fed rumen-protected methionine or …

Abstract:

The mechanisms underlying benefits of rumen-protected methyl donor supplementation during the transition period are largely unknown. Objectives were to evaluate performance, immunometabolic status, liver function, and the underlying mechanisms in response to rumen-protected methionine (MET) or choline (CHO) supplementation. Eighty-one multiparous Holstein cows were used in a randomized complete block design with 2 × 2 factorial arrangement of MET (Smartamine M; Adisseo NA) and CHO (ReaShure; Balchem Inc.) level (with or without). Treatments were control (CON) with no MET or CHO, CON + MET (SMA), CON + CHO (REA), and CON + MET + CHO (MIX). From −50 to −21 d before expected calving, all cows received the same diet (1.24 Mcal/kg DM). From −21 d to calving, cows received the same basal close-up diet (1.54 Mcal/kg DM) and were randomly assigned to treatments (CON, SMA …

Año de publicación:

2016

Keywords:

Fuente:

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