Japanese poultry science
Print ISSN : 0029-0254
Influences of Fasting and Fattening on the Amount of Meat and Eggs Produced by Re-feeding of Spent Layers
Kuninori FujinakaKen TatsudaToshinobu Yamasaki
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2001 Volume 38 Issue 6 Pages J152-J159


A study was made on the technology of refeeding layers. While making it, the basic technology to increase the amount of meat from spent layers by refeeding a broiler diet for 8 days after 4 days of fasting, and an investigation was made on the suitability of shortening the number of fasting days and lengthening the number of fattening days. In Experiment 1, forty 108 week old layers were forced to fast for 0, 2, 4 days, while in Experiment 2, forty 80 week old layers were fattened for 8, 11, 15 days.Then they were compared with the control group that were fed a layer diet.
As a result, the decrease in the laying rate was lower after fasting for 0 and 2 days than when fasted for 4 days. However, the meat weight was lower in the case of 4-day fasting, and the combined revenue from eggs and meat did not exceed the control value. With respect to the fattening days, laying rates of midterm and longterm fattening were slightly higher than that of shortterm fattening. However, meat weight was reduced by increasing the number of fattening days, and the combined revenue decreased after increasing fattening days.
The above results indicate that in refeeding layers through the combination of fasting and fattening, 4-day fasting followed by 8-day fattening was the most efficient for fattening layers.

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