Abstract
The efficacy of medium RPMI-1640 supplemented with either foetal bovine, normal bovine, goat or sheep sera was compared for prolonged in vitro propagation of Theileria annulata (Hisar) schizonts. Medium RPMI-1640 supplemented with 20% foetal bovine serum (standard growth medium) resulted in optimum growth of T. annulata (Hisar) schizonts in vitro. Comparable viability and non-viability counts were observed in growth media supplemented with normal bovine or goat sera. However, viability counts in medium supplemented with sheep serum were significantly lower than that of the standard medium. Mitotic indices of cultures of T. annulata (Hisar) schizonts were directly related to the extent of cell growth and were lower in various growth media supplemented with normal bovine, goat or sheep sera than in that of the standard medium. The results suggested that normal bovine and goat sera could be successfully used in place of foetal bovine serum in the growth medium for long-term in vitro propagation of T. annulata schizonts. The study will help in reducing the cost of large-scale in vitro propagation of T. annulata aimed at mass production of the cell culture vaccine.
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