PURPORT

Everything was Krsna. The calves, the cowherd boys and their maintainer Himself were all Krsna. In other words, Krsna expanded Himself in varieties of calves and cowherd boys and continued His pastimes uninterrupted for one year. As stated in Bhagavad-gita, Krsna's expansion is situated in everyone's heart as the Supersoul. Similarly, instead of expanding Himself as the Supersoul, He expanded Himself as a portion of calves and cowherd boys for one continuous year.