Sections 57.10 “Requirements for primary breeding flocks (grandparent flocks) and multiplier breeding flocks (parent flocks),” 57.11 “Requirements for commercial pullet grower flocks” and 57.12, “Requirements for commercial egg-producing poultry flocks,” shall apply to flocks placed in houses after the effective date of said sections. Poultry placed in houses prior to the effective date of said sections shall be deemed to comply therewith and shall remain eligible for use.