; and and inserting a semicolon; (C) in subparagraph (B), by striking is at least every 5 but not more than once every 3 years; and inserting contributes to the health and vigor of the established cover, and is not more than once every 3 years; and ; and (D) by adding at the end the following: (C) shall ensure that 25 percent of the acres covered by the contract are not harvested, in accordance with an approved plan that provides for wildlife cover and shelter; ; (2) in paragraph (3)— (A) in the matter preceding subparagraph (A), by striking not less than 25 percent and inserting 25 percent ; and (B) in subparagraph (B)— (i) in the matter preceding clause (i), by striking routine grazing, except that in permitting such routine grazing and inserting grazing, except that in permitting such grazing ; (ii) in clause (i), by striking continued routine grazing; and and inserting grazing; ; (iii) in clause (ii)— (I) in the matter preceding subclause (I), by striking routine grazing may be conducted, such that the frequency is not more than once every 2 years and inserting grazing may be conducted, such that the frequency contributes to the health and vigor of the established cover ; (II) in subclause (II), by striking the number of years that should be required between routine and inserting the appropriate frequency and duration of ; and (III) in subclause (III), by striking routine each place it appears; and (iv) by adding at the end the following: (iii) shall ensure that the grazing is conducted in accordance with an approved plan that does not restrict grazing during the primary nesting season and will reduce the stocking rate determined under clause (i) by 50 percent; and ; (3) by redesignating paragraphs (4) and (5) as paragraphs (5) and (6), respectively