There is a positive correlation to PLH resistance and improved forage quality. In an unpublished animal study by Combs, et. Balanced rations were formulated around the differing hay sources and fed to dairy cows in early lactation. The basis of the apparent improved forage quality of glandular-haired types is not known. The challenge for alfalfa breeders will be to incorporate the high levels of resistance required to provide complete protection against PLH losses, improve forage yield potential and maintain the improved forage quality characteristic of the glandular-haired types.
Current research suggests that progress is being made on all fronts.