author(s)
Praful Chandra Bhatnagar, JL Choudhary, B Bhardwaj, Chandr Shakhar and Deepak Kumar Sharma

abstract
Effect of beta carotene on multiparous infertile dairy cows was assessed in this study. A total of 135 dairy cows were divided into three groups, each of 45 cows. Group–I supplemented balance feed without minerals and vitamins while group II supplemented balance feed with minerals and vitamins without β-Carotene and group–III supplemented balance feed with minerals and vitamins with β-Carotene. Plasma β-Carotene concentrations were much higher in the β-Carotene group III {3•02 mg/L v. control (group 1) 1.32 mg/L} at 90 days. Conception rate was greatly improved by β-Carotene supplementation in cows (group III): conception rates at first group were 64.44% v. 37.77%.