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Evaluation of the metabolic status of Simmental dairy cows in early and mid lactation

Radojica Djoković
Department of Animal Science, Faculty of Agronomy, Čačak, University of Kragujevac, Cara Dušana 34, 32000 Čačak, Serbia
Abstract :
Fifteen early-lactation cows and 15 mid-lactation cows were chosen for the analysis. Blood samples
were collected to measure the beta-hydroxybutyrate (BHB), non-esterified fatty acids (NEFA),
triglycerides (TG), glucose (Glu), total protein (TP), albumin (ALB), total bilirubin (TB), urea (U)
and the activity of aspartate transaminase (AST) and gamma-glutamyl transferase (GGT). Early-
lactation cows showed significantly higher (P<0.05) values of serum BHB and NEFA, and lower of
(P<0.05) glycemia levels compared to mid-lactation cows. High lipomobilization (NEFA >0.4 mmol/l)
and subclinical ketosis (BHB >1.2 mmol/L) were detected in 6 (40%) and 14 (94.4%) early-lactation
cows, respectively, and in none of the mid lactation cows. AST activities above 100 IU/l were detected
in two early-lactation and none of the mid-lactation cows. TG concentrations below 0.12 mmol/l
were found in 7 (44%) early-lactation and 2 (13.3%) mid-lactation cows. Glucose levels were below
2.5 mmol/l in 10 (66.6%) early-lactation and 5 (33.3%) mid-lactation cows. Early-lactation cows
showed lower blood serum concentrations of TG (P>0.05), ALB (P>0.05), TP (P<0.05), U (P>0.05)
and GTT (P>0.05) activities and higher concentrations of TB (P>0.05) and AST activities (P<0.05),
as compared to mid-lactation cows. These metabolic characteristics were correlated with DMI and
energy balance (EB). Blood serum values for glucose, TG, BHB, NEFA and AST showed that early-
lactation cows suffered from metabolic disturbances, associated with ketosis, and some degree of
hepatic lesions, probably due to fat infiltration. These serum parameters may have a key role in
evaluating the metabolic status of dairy cows.
Keywords :
blood metabolites/ dairy cows/hepatic lipidosis/subclinical ketosis

Date Deposited : 02 Apr 2015 09:51

Last Modified : 02 Apr 2015 09:51

Official URL: http://www.ighz.edu.pl/?p0=5&p1=34

Volume 31, Number 2, - 2013

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