産卵鶏のヘマトクリット値におよぼす日周変動,産卵後の時間,環境温度および食塩の影響

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タイトル別名
  • Effects of Diurnal Rhythm, Time after Oviposition, Environmental Temperature and Dietary Sodium Chloride on Hematocrit Value in Laying Hens
  • Effects of Diurnal Rhythm Time after Ov

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In order to determine plasma amino acid concentration (PAAC), corpuscle fraction (Ht) and plasma protein fraction (PPF) are removed before determination of PAAC. If both fractions fluctuate widely, the PAAC may be affected by them. Thus, the factors expected to affect PAAC, 1) a diurnal rhythm, 2) times after oviposition, 3) ambient temperature and 4) dietary sodium chloride were studied. Fifteen-month-old Single Comb White Leghorn hens were housed in individual wire cages and given free access to the basal diet and water. In Experiment I and 2, blood samples were taken from the wing vein by veinpuncture five times at two h interval from 9:00 to 17:00, and four times at 0, 5, 10 and 21h after oviposition. In Experiment 3, the ambient temperature was elevated from 16.0, 25.0 to 32.0°C or the dietary sodium chloride from 0.38 to 1.28% at every two days interval successively and blood samples were taken before changing temperature and dietary sodium chloride levels. At all blood sampling times, Ht and PPF remained constant. Water intake and feed intake were affected by ambient temperature and dietary sodium chloride levels, but Ht and plasma water content were not affected by them. These results indicated that it would be possible to use the PAAC as a parameter for determination of amino acid requirements without counting the fluctuation of Ht, PPF and plasma water content caused by diurnal rhythm, time after oviposition, ambient temperature and dietary sodium chloride.

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  • 日本畜産学会報

    日本畜産学会報 68 (3), 301-304, 1997

    公益社団法人 日本畜産学会

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