Providing up to 2.4 kg of hay in a pellet or a cube, in addition to 4-5 kg of cereal grain, did not improve milk fat content or milk production. This has implications for feeding extra fibre in spring and it is important to consider some key points.
Pasture type is very important because of the differences in fibre content of different species.
The NDF content of the diet of grazing cows is most likely to be marginal when cereal grain supplements are fed. A different conclusion may have been reached if the pastures contained a higher proportion of clover, if higher levels of cereal grain were offered to the cows, or if cows were in better body condition.