An animal nutritionist in the North West says that the impact of the current dry spell depends very much on the land.
Justin McDonagh, Aurivo Animal Feeds Nutritionist, says the land here is heavier than in other parts of the country.
He says as a result the stress on the grass and the land has not been as bad.
But the problem is starting to impact now.
He has the following basic advice for farmers about grass growth at present: