Charles A. Burmeister, 91, a pioneer in livestock market reporting and research in the Department of Agriculture, died of cardiac arrest Wednesday at the Morningside Manor retirement home in San Antonio, Tex.

Mr. Burmeister was born in Tilden, Tex., and graduated from Texas A&M University in 1908. He joined the Department of Agriculture in 1911 and divided his time for the next four years between Texas and Washington, conducting experiments in dry farming.

In 1915, he joined the livestock unit in the department's bureau of markets. There he helped develop the livestock market news service and market reports. The market service began operating on a nationwide basis in 1915. Mr. Burmeister continued to work in livestock economics until his retirement in 1952.

He became a private economist on livestock marketing after leaving the government. He retired a second time in 1974.

Mr. Burmeister earned a master's degree in economics from American University in 1927. During World War II, he worked with the War Production Board.

Until he moved to San Antonio in 1975, Mr. Burmeister had been active in many civic and gardening organizations here. He was president of the Forest Hills citizens Association in Washington for several terms and a member of the Northwest Council. He also had been president of the Fossils Club and of the Washington Lily Society.He was a secretary-treasurer of the Men's Garden Club of Montgomery County.

Survivors include his wife, Josephine, of the home in San Antonio; two brothers, Gustav, of Chevy Chase, and Russell, of Pleasanton, Tex., and two sisters, Mrs. Tom Franklin and Mrs. Carl Hollingsworth, also of Pleasanton.