育成鶏体重を目標体重に調整する簡便な方法の検討

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  • A Simple Method to Adjust a Pullet's Current Body Weight to its Objective Body Weight.
  • 育成鶏体重を目標体重に調整する簡便な方法の検討〔英文〕
  • イクセイケイ タイジュウ オ モクヒョウ タイジュウ ニ チョウセイスル カン

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In order to develop a simple and reliable method to adjust a pullet's current body weight to its objective body weight which is a weight either recommended by a breeder's manual or determined by a farmer's experience, three experiments were carried out using Single Comb White Leghorn pullets that were 8 to 17 or 18 weeks of age. The experiments involved different environmental conditions for the pullets, ad libitum feeding and restricted feeding. In the case of restricted feeding, the amount of feed supplied to the pullets was determined by both the energy in the feed and the calculated energy required by the pullet for either maintenance or weight gain for the next week. The energy requirement was calculated using either a linear or multiple regression equation involving the pullet's body weight and energy intake for the preceeding two weeks together with the pullet's objective body weight for the following week. Regression equations were calculated using six data sets of the average body weight and energy intake of pullets in three replicates. In the first experiment, a linear or multiple regression equation was investigated. Pullets were raised in an open house without photo-control, resulting in a natural cycle of daylength. In the linear regression equation for this case, the energy for body weight gain was set at 3kcal/g. In the second experiment, pullets were raised under the same environmental conditions as in the first experiment. However, in the linear regression equation, the energy required for body weight gain was set at either 1, 2, or 3kcal/g. In the third experiment, pullets were raised in a windowless house that was kept at 28 to 32°C. In this case, the energy required for body weight gain was set at either 2.5 or 3kcal/g. Our results show that it is possible to control the body weight of pullets within 30g of its objective body weight using a linear regression equation in which energy required for body weight gain was set at 3kcal/g.

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