Gummow, Bruce; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)
Eight Bonsmara bulls and eight Bonsmara heifers, having masses of between 210 and 266 kg when
selected, were randomly allocated to four groups, each comprising two bulls and two heifers. Group 1
received 0,6 mg of copper ...