DeBenedetti, R.C.; Kiracofe, G.H.; Ward, H.S.; McKee, R.M.
(Kansas State University. Agricultural Experiment Station, 1977)
One hundred seven of 112 heifers were in estrus 1 to 5 days after
an injection of prostaglandin F2α given when a 7-day synchronization implant
was removed. Checks for estrus were made every four hours and
heifers were ...