APA

Richardson A. M., Hensley B. A., Marple T. J., Johnson S. K. & Stevenson J. S. (20030325). Characteristics of estrus before and after first insemination and fertility of heifers after synchronized estrus using GnRH, PGF2alpha, and progesterone. : Journal of animal science.

Chicago

Richardson A M, Hensley B A, Marple T J, Johnson S K and Stevenson J S. 20030325. Characteristics of estrus before and after first insemination and fertility of heifers after synchronized estrus using GnRH, PGF2alpha, and progesterone. : Journal of animal science.

Harvard

Richardson A. M., Hensley B. A., Marple T. J., Johnson S. K. and Stevenson J. S. (20030325). Characteristics of estrus before and after first insemination and fertility of heifers after synchronized estrus using GnRH, PGF2alpha, and progesterone. : Journal of animal science.

MLA

Richardson A M, Hensley B A, Marple T J, Johnson S K and Stevenson J S. Characteristics of estrus before and after first insemination and fertility of heifers after synchronized estrus using GnRH, PGF2alpha, and progesterone. : Journal of animal science. 20030325.