An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Stringfellow DA, Givens MD.Stringfellow DA, et al.Theriogenology. 2000 Jan 1;53(1):85-94. doi: 10.1016/s0093-691x(99)00242-3.Theriogenology. 2000.PMID: 10735064Review.