The content of lead in some organs and tissues of Hereford bull-calves K. N. Narozhnyh, Y. V. Efanova, V. L. Petukhov, O. S. Korotkevich, B. A. Skukovsky and G. N. Korotkova E3S Web of Conferences, 1 (2013) 15003 Published online: 23 April 2013 DOI: 10.1051/e3sconf/20130115003