Simms, D.D.; Schwarz, F.L.; Corah, L.R.
(Kansas State University. Agricultural Experiment Station, 1982)
Over a 3-year period (1976-1978), heifer calves either were not implanted
or were implanted between 2 and 5 months of age. In 1977, the study also
included heifers implanted at birth. Implanting at birth increased ...