I disagree, it hasnt killed out the grass, the ley is thicker this year for self seeding.Like the Danish red.
Not one for letting grass head. Kills out the sward. And if some seed drops and sprouts for next year, then you have a new sward bred from the earlier heading varieties, which is the opposite to what you'd want.
The problem with it is, its not cool and gonna get you in dairy farmer magazine with some expensive dry cow diet.
Also Our swards will only ever see 5 seasons before there replaced.