He was fined Rs 5 lakh for each case, failing which he would serve another six months in jail, a CBI counsel said.
Lalu heard the sentencing from jail via video conferencing. Lalu's son said that he would approach the Patna high court for his father's bail.
The RJD went into a huddle immediately after the pronouncement of the sentence.
On Friday, citing illness and old age, Lalu had sought leniency from the court.
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.
Lalu has been convicted in one of the cases of the fodder scam, wherein Rs. 900 crore from the Bihar exchequer was siphoned off under the pretext of purchasing fodder for livestock, during the '80s and '90s.
He was convicted by the special court on Dec 23.
Prasad was granted bail by the Supreme Court after having spent over two-and-a-half months in jail.
A total of six cases related to the scam, were being probed by the investigation authorities.
He was sent to prison for five years on September 30, 2013.
In the fodder scam case, out of 22 accused, 16 were convicted. The conviction in this case pertains to embezzling of more than Rs89 lakh from the Deoghar Treasury between 1991 and 1994.