Assessment of performance, oxidative stress status, and plasma amino acid profiles in peripartal dairy cows supplemented with rumenprotected methionine or choline and with …

Abstract:

Objectives were to evaluate performance, oxidative stress status, and plasma AA profiles of peripartal dairy cows with different liver functionality indices (LFI). Forty multiparous Holstein cows were randomly assigned to control (CON), no methionine (MET) or choline (CHO), CON+ MET, CON+ CHO, and CON+ MET+ CHO treatments. Cows received the same diet (1.52 Mcal/kg DM) from-21 d (close-up) to calving. Cows were on the same diet (1.71 Mcal/kg DM) after calving and continued to receive the same treatments through 30 d. Blood samples were taken at-30,-10, 4, 14, and 28 d relative to calving. Liver samples were harvested at-10, 7, 20, and 30 d relative to calving. Methionine supplementation was adjusted daily at a rate of 0.08%(DM basis) of diet and CHO was supplemented at 60 g/cow per day. Main effect of LFI was analyzed using PROC MIXED in SAS. The LFI is an index assessing transition cow …

Año de publicación:

2016

Keywords:

Fuente:

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