Studies on the Restriction of Feed Supply for Meat-type Pullet:II. Effects of Feeding Programs of Restricted Daily Supply of Feed or of Skip-a-day in Two Days
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Collaborative experiments at 6 Prefectural Poultry Experiment Stations were carried out with 1, 550 White Plymouth Rock pullets in total to compare the effects of 4 restricted feeding programs during the growing and laying stages on the performance of meat-type breeders, hatched in spring or autumn. In each of the Stations, pullets were grouped into 5 lots at 7 weeks of age. One lot was the control and fed ad libitum throughout the growing and laying periods until 72 weeks of age. To two lots out of five in each of the Stations, twice the quantity of daily supply of the grower diet restricted as shown in Table 1 was served on every other day. At 24 weeks of age, they were fed the layer diet ad libitum. After 44 weeks of age, feed supply of one of the 2 lots was restricted again as shown in Table 1. The pullets of the remaining 2 lots were fed the grower diet ad libitum on alternative day, i.e. on skip-a-day feeding program. Those of one of the 2 lots were fed the layer diet ad libitum every day after 24 weeks of age, while those of the other lot were fed alternatively throughout the laying period.Restriction of daily supply of the grower diet resulted in the delay of sexual maturity for 26 days with heavier first egg and with 15% higher hatching egg production than those of the control. The feed cost per hatching egg was \3.35 lower on this feeding program than that of the control. Restriction of feed supply at the later half of the laying period reduced slight by the egg production, but the feed cost per hatching egg was reduced further by this feeding program, being \4.20 lower than that of the control.The data supported the conclusion of the previous paper that restricted feeding program, which made the body weight at 24 weeks of age equal to or less than 70% of that on the ad libitum feeding program, is favorable to get maximum hatching egg production.Skip-a-day feeding program was confirmed to be rather mild restriction, resulting in 9% restriction of body weight at 24 weeks of age and the delay of 16 days of the sexual maturity. Hatching egg production, when the pullets was fed the layer diet ad libitum, was 9% higher with \2.46 lower feed cost per egg than those of the control group.Skip-a-day feeding program thoughout the growing and laying period resulted in the almost identical hatching egg production to that of the control, sparing about 10% of the layer diet and resulting in \1.92 lower feed cost per egg than those of the control.Season of hatch had not the influence on the performance of the pullets regardless of various feeding program.
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