Radiation treatment of feedstuffs

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  • 飼料の放射線処理
  • In vitro ニ オケル ショウカリツ , トリプシンインヒビター ノ カッセイ オヨビ ユウコウセイ リジン ニ オヨボス デンシセン ノ エイキョウ ト ケナガコナダニ ノ サッチュウセンリョウ ニ ツイテ
  • 1. Digestibility of irradiated starch pulp, corn cob meal and soybean flour in vitro and disinfestation dose of tick (Tyrophagus putrescentiae)
  • I. In vitroにおける消化率,トリプシンインヒビターの活性および有効性リジンにおよぼす電子線の影響とケナガコナダニの殺虫線量について

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Abstract

Several feed ingredients were irradiated up to 20 Mrad by cathode ray and the digestibility in vitro, the activity of trypsin inhibitor in soybean flour, the content of available lysine in raw soybean flour and torula yeast were investigated.<br>The following results were obtained:<br>1. After the radiation treatment by cathode ray with 6, 10, 20 Mrad, sweet potato pulp and corn cob meal were digested by diastase and raw soybean flour and torula yeast were by pepsin. The content of crude starch and crude fiber decreased with dose (Tables 2, 3). Although the digestibility of crude starch residue in starch pulp was prompted with dose, the opposite result was obtained in corn cob meal (Table 1). The digestibility of protein in raw soybean flour increased with dose but there was little difference between irradiated and non-irradiated torula yeast (Fig. 1).<br>2. The activity of trypsin inhibitor in raw soybean flour was reduced gradually with dose and the rate of inactivation were 18% and 58% for 10 Mrad and 20 Mrad respectively. When water was added to the raw material the sensitivity of trypsin inhibitor to the radiation was raised up remarkably (Fig. 2). However, the inactivation ratio of trypsin inhibitor at the practical dose was implied to be only a few percent. The content of available lysine in raw soybean flour decreased gradually with dose and the rate of decrement was 18% for 20 Mrad. On the other hand, in the case of torula yeast the content of available lysine was not changed by radiation treatment (Table 4).<br>3. Pre-breeded ticks (Tyrophagus putrescentiae) were mixed with several different feed materials and irradiated by cathode ray up to the dose of 160 Krad. After the breeding at RH 70%, 25-30°C for one month, ticks irradiated over 80 Krad in different feed materials were not increased (Tables 5, 6). About 50 Krad of irradiation would be enough for effective disinfestation of ticks considering the sterilization of ticks.

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