福岡県農業総合試験場研究報告

[摘要]肥育豚のふん排泄量を低減させるため、複合酵素、植物細胞膜崩壊酵素及びカプセル化植物細胞膜崩壊酵素添加飼料給与が、生ふん量、発育、飼料利用性等に及ぼす影響について検討した。①複合酵素（主にセルラーゼ）は0.2％添加区では、乾物の消化率は対照区に比べ1.1％向上し、生ふん量は11％減少したが、飼料費は高くなった。②植物細胞膜崩壊酵素（主にペクチナーゼ）は0.2％、0.5％添加区では、乾物の消化率は対照区に比べそれぞれ1.9％および5.7％向上した。生ふん量は対照区に比べそれぞれ11％および41％減となり有意（Ｐ＜0.01）に低減できた。飼料要求率は酵素の飼料添加割合の増加に伴って良くなり、0.1～0.3ポイント向上した。と体品質は各区間には差はなかった。飼料費は酵素0.2％添加区では、対照区より安くなったが、酵素0.5％添加区では高くなった。③マイクロカプセル化植物細胞膜崩壊酵素は0.5％添加区では、乾物消化率は対照区に比べ6.0％向上し、生ふん量は減少率43％と大幅に減少した。以上の結果から、複合酵素、植物細胞膜崩壊酵素を肥育豚用飼料に添加給与することにより飼料の消化率が改善され、ふん排泄量が減少することが明らかになった。また、植物細胞膜崩壊酵素の添加割合が0.2％では飼料利用性が向上し、それに伴い飼料費が下がった。さらに、その酵素の添加割合を上げ、カプセル化し、飼料に添加給与することにより、飼料の利用性が一層向上し、ふん排泄量の低減効果が大きくなることが明らかになった。

［キーワード：肥育豚、ふん排洪量、酵素、飼料費、マイクロカプセル化］

　For the purpose of decreasing the quantity of pig excrement, research was carried out to detect the effect of using composite enzymes(Aspergillus niger var macrosporus, Trichoderma Koningi), plant cell membrane collapse enzyme(Aspergillus usamii mut. shiro‐usamii) and microcapsulated plant cell membrane collapse enzyme as diet additives on digestibility, excrement quantity, gain of body weight, feed conversion, carcass quality and feeding costs. 1)Dry matter digestibility of pigs being fed a diet with the addition of 0.2% a composite enzyme based on cellulase(A) was higher by 1.1% than that of the control. Excrement quantity of (A) decreased by 11% compared with the control. The feeding cost of (A) was higher than that of the control. 2)Dry matter digestibility for pigs being fed a diet with an addition of 0.2%(B) and 0.5%(C) of plant cell membrane collapse enzyme based on pectinase was higher by 1.9-5.7% than that of the control. Excrement quantity of (B) and (C) were significantly(p<0.01) lower by 11-41% than that of the control. The feeding conversion rate decreased by 0.1-0.3 as a result of increasing the additive ratio of enzyme. The feeding cost of (B) was lower than that of the control, but, that of (C) was higher than the control. 3) Dry matter digestibility for pigs being fed a diet with the addition of 0.5%(D) microcapsulated plant cell membrane collapse enzymes was higher by 6% than that of the control. The excrement quantity of (D) decreased by 43% compared with that of the control.

　The results suggested that digestibility was improved and excrement quantity was decreased by being fed a diet with the addition of composite enzyme, plant cell membrane collapse enzymes and microcapsulated enzymes. Especially, it was effective to feed a diet with the addition of 0.5% microcapsulated plant cell membrane collapse enzymes.