Study on the Relationship between Liver Parasitic Infections and Serum Vitamin A and β-Carotene Status in Cattle.

OBJECTIVE: This study was conducted to evaluate the relationship between serum levels of vitamin A and β-carotene in the liver of cattle.

METHODS: A total number of 150 samples were selected according to the type of parasitic infections of the liver after postmortem examination and confirmation. Parasitic lesions in the liver were subdivided into three major parasites, including Fasciola hepatica, Dicrocoelium dendriticum, and hydatid cysts. Fifty samples were obtained from cattle without any parasitic infection as a control group. Serum levels of vitamin A, β-carotene concentrations (μg/dL), alanine aminotransferase (ALT), and aspartate aminotransferase (AST) activity were assayed.

RESULTS: Naturally infected cattle with D. dendriticum, F. hepatica and hydatid cyst showed lower vitamin A levels. Serum β-carotene levels were significantly decreased in all groups (p<0.05). ALT and AST activities in animals with parasitic diseases were statistically higher than in control group (p<0.01). A significant negative correlation was determined between the β-carotene, vitamin A levels and enzyme activities of the liver in all the three types of liver infections (p<0.001).

CONCLUSIONS: This study indicated that serum levels of vitamin A and β-carotene decline was present in cattle with liver parasite infection and vitamin supplements should be supplied.