S. D. Helmer

HELMER, S. D., & BRITT, J. H. (1985). MOUNTING BEHAVIOR AS AFFECTED BY STAGE OF ESTROUS-CYCLE IN HOLSTEIN HEIFERS. JOURNAL OF DAIRY SCIENCE, 68(5), 1290–1296. https://doi.org/10.3168/jds.S0022-0302(85)80959-0