Section 13(b)(13) of the Fair Labor Standards Act exempts from the
overtime provisions of section 7:
Any employee with respect to his employment in agriculture by a
farmer, notwithstanding other employment of such employee in connection
with livestock auction operations in which such farmer is engaged as an
adjunct to the raising of livestock, either on his own account or in
conjunction with other farmers, if such employee (A) is primarily
employed during his workweek in agriculture by such farmer, and (B) is
paid for his employment in connection with such livestock auction
operations at a wage rate not less than that prescribed by section
6(a)(1).