Nichols, James R.2015-08-052015-08-051966-11http://hdl.handle.net/10919/555216 pagesapplication/pdfen-USVirginia Cooperative Extension materials are available for public use, re-print, or citation without further permission, provided the use includes credit to the author and to Virginia Cooperative Extension, Virginia Tech, and Virginia State University.LD5655.A762Dairying -- PeriodicalsDairy cattle -- PeriodicalsExtension publicationSiresDairy breedsSelection