Abstract
Twenty four heifers of Holstein in 3 stations were administered with synthetic estrogen "Euvestin", one million I. U. in total, and their induced lactation, reproduction and growth were examined.
The total milk yeild was 952.5 kg., thepeak yield 5.60 kg., and milk fat 3.35% in average. There we-re differences inresults between stations, and it suggested that not only genetic factors but also environ-mental factors played an important role.
The coefficients of correlation between dairy characters were calculated and the phenotypic resemblance between half sibs in dairy characters showed fairly high value, O.318-0.588.
The influence of the treatment upon reproduction was not so much excepting few cases, and that upon growth was slight.
