Mid September should be OK. If it decides not to germinate it will stay dormant in the soil till springIs it too late for stictching/ broadcasting in clover into a grass ley? We'd normally do this in August but harvest has delayed us. Always felt September was getting too late. But then again April is a long way away...
Put a cup of veg oil in the water trough every day their in the field certainly helpsNot letting them go into anywhere hungry.
Drench if worried with veg oil.
Dairy cows would be biggest risk. Young stock set stocked so no issue