Temporal dynamics of nutrient balance, plasma biochemical and immune traits, and liver function in transition dairy cows

Yangchun Cao,C. Cai,Chao Yu,Shengxiang Li,Junhu Yao

Published 2020 in Journal of Integrative Agriculture

ABSTRACT

Abstract The objective of this study was to analyze the dynamics of nutrient balance, physiological biomarkers and comprehensive indexes associated with metabolism and function of organs in transition cows. Fourteen transition cows were used for this research. Dietary intake was recorded daily, and samples of the diet, venous blood and milk were collected for measurements. The balance values of net energy for lactation (NEL), metabolizable protein (MP), and metabolizable glucose (MG) were calculated, and regression analysis and calculation of comprehensive indexes were performed. Accordingly, the prepartum cows presented positive balances of NEL, MP, and MG, while severe negative balances were found during the postpartum period. Dynamic changes of energy metabolism, nutrient mobilization, liver function, anti-oxidative status and immune response, as indicated by blood biomarkers and modified comprehensive indexes, were out of sync with the calculated balance values, but they were closely related to the day relative to calving. Compared with the 21 d prepartum, the plasma concentrations of non-esterified fatty acids (NEFA) and β-hydroxybutyric acid (BHBA) were significantly increased around and after calving (P

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