Non-phytate phosphorus requirement of laying hens reared in Kyushu district in Japan.
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概要
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A study was carried out using facilities attached to three different poultry research stations of three prefectures in Kyushu district in Japan. Two experiments were conducted to determine the quantitative dietary np-P requirement of Shaver Starcross 288, white Leghorn hens. In both experiments, corn-soybean meal based diets contained 0.20, 0.35, 0.50 or 0.65% np-P were fed. All diets contained 15.0% crude protein (CP) and 2750 kcal metabolizable energy (ME). Tricalcium phosphate was used to attain a np-P levels of 0.35-0.65%. The first experiments started in December 1986 and the second experiments started in June 1987. The hens were 20 weeks old when the experiments were set up. All hens houses used in the present investigation were open-sided houses. The birds were assigned to four dietary groups and fed the respective experimental diet ad libitum throughout 48 weeks experimental period. The experimental period was divided into 3 stages to observe the influence of laying stage.Egg production rate, egg weight and egg yield increased as the dietary np-P level increased. Egg yield of hens fed 0.50-0.65% np-P diets was significantly higher than that of 0.20% np-P diet. There were no significant differences between any levels of 0.35-0.65%. Feed intake and body weight gain also increased as the dietary np-P level increased. Feed conversion and viability were not affected by dietary np-P levels.However Egg shell quality decreased as the dietary np-P level increased. Egg shell thickness, egg shell breaking strength and egg shell weight ratio decreased as the np-P level increased. From the combined data from two experiments it was concluded that the np-P requirement of laying hens in Kyushu district was 0.35%.
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日本家禽学会 | 論文
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