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• W2330475670 abstract "We have examined the effect of feed restriction on layers during raising or laying stage and through both stages. The experiment was carried out with strain cross of White Leghorn, Crossbred of Rhode Island Red _??__??_ x White Leghorn _??__??_ and strain cross of Rhode Island Red hatched on September 9, 1969. Numbers of layers used in this experiment were 224 of the three breeds. The layers were fully fed until 70 days of age. Each breeds were divided into 4 restricted feeding programs.Treatment No. 1. Fed ad libitum thoughout 0-519 days of age.Treatment No. 2. Fed ad libitum during 0-154 days of age, thereafter feed restriction rate was 90% of full diet of the No. 1 group during 155-519 days of age.Trestment No. 3. Fed skip-a-day feeding in two days during 71-154 days of age, thereafter ad libitum during 155-519 days of age.Treatment No. 4. Fed skip-a-day during 71-154 days of age, thereafter ad libitum during 155-182 days of age, and during 183-519 days of age feed restriction rate was 90% of full diet of the No. 3 group.Feed comsumption during 71-154 days of age of No. 3 and 4 groups was 61.5% that of No. 1 and 2 groups, and average body weight at 154 days of age was 70.6% that of No. 1 and 2 groups. Average rate of raising of No. 1 and 2 groups was 99.3% and that of No. 3 and 4 groups was 97.9%.By means of the feed restriction during raising period, the hen-day egg production of No. 3 and 4 groups was 69.6%, and it was 1.7% lower than that in the No. 1 and 2 groups, therefore the egg production per bird per day was 39.2g, and it was 0.6g lower than that in the No. 1 and 2 groups. Feed intake per bird per day of No. 3 and 4 groups during laying period was 113.5g, and it was 2.0g more than that in the No. 1 and 2 groups. Therefore the feed conversion ratio of No. 3 and 4 groups 2.90, and it was 0.1 more than that in the No. 1 and 2 groups.By mesns of the feed restriction during laying period, the hen-day egg production of No. 2 and 4 groups was 69.9%, and it was 1.1% lower than that in the No. 1 and 3 groups. Therefore the egg production per bird per day of No. 2 and 4 groups was 38.9g, and it was 1.3g lower than that in the No. 1 and 3 groups. Feed intake per bird per day of the No. 2 and 4 groups was 103.7g, and it was 17.7g less than that in the No. 1 and 3 groups. Restricted feeding in laying period improved the feed conversion ratio by 0.36.Crude profit per bird of No. 3 and 4 groups was 45 yen more than that in the No. 1 and 2 groups, and that in No. 2 and 4 groups was 169 yen more than that in the No. 1 and 3 groups. Average crude profit of three breeds was as follows, No. 1 group was 940 yen, 1, 137 yen in the No. 2 group, 1, 014 yen in the No. 3 group and 1, 154 yen in the No. 4 group. Crude profit of the No. 4 group was the highest the among groups, by means of the feed restriction throughout raising and laying periods, Whereas the value of the No. 1 group was the smallest among the groups, by means of full diet throughout raising and laying periods." @default.
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• W2330475670 date "1977-01-01" @default.
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• W2330475670 title "Studies on Feed Restriction of Layers" @default.
• W2330475670 doi "https://doi.org/10.2141/jpsa.14.71" @default.
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