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.
The counsel said failure to pay a fine of Rs 5 lakh each under the IPC and the PCA would entail another six months in jail for the RJD leader.
Lalu heard the sentencing from jail via video conferencing.
The verdict on Saturday came after two postponements of the pronouncement of the quantum of punishment after the court found the RJD chief guilty in December previous year.
Lalu Prasad Yadav's advocate on Friday had filed a plea before Ranchi Special CBI Court demanding minimum punishment to the RJD Chief on health grounds.
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He also slapped a Rs 5 lakh fine on the former Bihar Chief Minister.
Earlier in the day, Lalu's wife Rabri Devi has called an emergency meeting to decide the individual roles for party leaders in likely absence of the RJD chief. The 16 convicted people include three former IAS officials Phoolchand Mandal, Beck Julius and Mahesh Prasad.
RJD chief Lalu Prasad Yadav and 15 others were convicted in a fodder scam case. He was sent to Birsa Munda Jail in Ranchi.
Prasad was given a prison term of five years on September 30, 2013, in another fodder scam case.
There were 34 accused in the case, out of which 11 died during the trial, while one turned CBI approver and admitted to the crime. Lalu has been convicted in the Deoghar Treasury case.