Effect of Various Light Treatments During Growing Period on Egg Production of October Hatched White Leghorn Pullets

RESULTS in two previous experiments with October-hatched White Leghorns showed, during a period of 51 weeks egg production, that birds which had received daylight only until they were 20 weeks old laid an average of seven or eight eggs more per bird than those which had received 16 hours light daily (Lowe and Heywang, 1961). It was considered desirable to obtain more data about the effect of various light treatments during the first 20 weeks of age on subsequent egg production of White Leghorns hatched in October. Reported in this paper are the results of three experiments conducted at this station in three successive years. PROCEDURE Day-old White Leghorn pullets of the same strain and hatched during the fourth week of October were used. Experiments were conducted in three successive years. At the start of the first and second experiments, 110 chicks were in each of six groups and 105…