Sprott, L.R.; Corah, L.R.; Riley, J.G.; Kiracofe, G.H.
(Kansas State University. Agricultural Experiment Station, 1981)
Heifers fed low energy diets gained less before calving, took longer
from calving to first estrus, and dropped lighter calves. Their conception
rates were lower and fewer showed estrus the first 20 days of breeding.
Rumensin ...