CBI court judge Shiv Pal Singh, who had convicted Prasad, along with 10 others on December 23, also imposed a fine of Rs 10 lakh on him for two cases in the scam.
He was fined Rs 5 lakh for each case, failing which he would serve another six months in jail, a CBI counsel said.
The court had convicted Prasad for offences of cheating, along with criminal conspiracy, under the Indian Penal Code (IPC) and the Prevention of Corruption Act.
The 69-year-old RJD supremo, in a written plea yesterday, had sought leniency from the CBI court citing illness and old age, according to his counsel Chittaranjan Prasad.
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The RJD went into a huddle immediately after the pronouncement of the sentence.
RJD sources said that the party would appeal against the verdict.
This is the second fodder scam case in which Prasad has been jailed.
He was sent to prison for five years on September 30, 2013.
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