**College of Veterinary’ Sciences, G B. Pant University of Agriculture and Technology, Pantnagar - 263145, India
Livestock Research Centre. G B. Pant University of Agriculture and Technology, Pantnagar-263145, India
*Present address Division of Animal Reproduction, Indian Veterinary Research Institute, Izatnagar-243122, India
Online published on 5 January, 2012.
Prepubertal levels of plasma Ca, Inorganic P, Mg, Cu and Zn were measured In 18 crossbred heifers. Plasma levels of Ca, P and Mg were not related with age at puberty (P>0.05). Plasma levels of Cu and Zn were significantly related to age at puberty (P>0.01). Heifers with Cu level of 125 µg/dl and Zn level of 230 µg/dl in plasma attained puberty earlier than those having levels lower than these.
