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| Studies on the Relationship Between Sub-Clinical Ketosis and Liver Injuries Within the First Two Months of Lactation Period in High Producing |
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S. Nazifi,
M. Mohebbi Fani,
E. Rowghani and M.R. Behbood |
Abstract:
The relationship between Sub-Clinical Ketosis (SCK)
and liver injuries within the first two months of lactation in three commercial
dairy herds with rather constant routines in management and nutrition
was studied. A total of 77 cows (38 cows in the first and 39 cows in the
second months of lactation) were sampled for blood. The serum concentrations
of glucose, beta-hydroxybutyrate (BHB), nonesterified fatty acid (NEFA),
aspartate aminotransferase (AST), gamma-glutamyl transferase (GGT), cholesterol,
triglyceride and VLDL-cholesterol were measured at 30 and 60 days after
calving. Sub-clinical ketosis was considered in cows with serum concentration
of BHB>1000 μmol L-1. The concentration of serum glucose
in cows with SCK was significantly (p<0.05) lower than healthy cows
after 30 days of calving. However, the concentrations of serum BHB, NEFA,
triglyceride and VLDL-Cholesterol in SCK cows were significantly higher
(p<0.05) than the healthy cows. In second month of lactation, the concentrations
of serum BHB and NEFA in SCK cows were significantly higher than the healthy
cows. The concentration of serum BHB, NEFA, triglyceride and VLDL-cholesterol
in SCK cows were significantly higher (p<0.05) than the healthy cows
at 30 and 60 days postpartum periods. In the first and second months of
lactation, a positive significant correlation was observed between serum
glucose and GGT (R = 0.409, p<0.05) in the healthy cows. However, significant
correlations were observed between serum glucose and cholesterol (R =
0.403, p<0.05) and GGT and cholesterol (R = 0.388, p<0.05) in cows
with SCK. Hepatic injuries were not observed in cows with SCK. In spite
of negative energy balance in the first and second months of lactation,
liver function tests were normal. The results of this study showed that
the concentration of serum BHB and NEFA of SCK cows within the first two
months of lactation was significantly higher than healthy cows, possibly
due to higher energy demands of cows at this stage.
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How to cite this article:
S. Nazifi, M. Mohebbi Fani, E. Rowghani and M.R. Behbood, 2008. Studies on the Relationship Between Sub-Clinical Ketosis and Liver Injuries Within the First Two Months of Lactation Period in High Producing. International Journal of Dairy Science, 3: 29-35.
DOI: 10.3923/ijds.2008.29.35
URL: https://scialert.net/abstract/?doi=ijds.2008.29.35
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