Research from the
Average daily gain from 29 to 56 days of age was nearly three-fourths of a pound greater for the long-day calves. They also ate more starter per calf per day than the short-day calves. (Please see the chart below.) That, say the researchers, “stimulated faster rumen development” in these calves.
During the study, the researchers used fluorescent lights to achieve a lighting intensity of about 600 lux at eye level. Study results can be found in the November 2007 Journal of Dairy Science.