Çalışmada Türkiye 'de üretilen veya ithal edilen soya fasulyesi unu örneklerinde üreaz etkinlik düzeyi ve kanatlı kanna yemlerinde toplam yağ içeriği ve bu yağlarda ölçülen peroksit değerinin ortaya konulması amaçlanmıştır. Bunun için, Nisan 1993-Nisan 1995 döneminde, Türkiye'nin 7 bölgesinde faaliyette bulunan 48 yem fabrikasından düzenli aralıklarla 11 O'u soya fasulyesi unu ve 286'sı kanatlı karma yeminden oluşan 396 örnek sağlanmıştır. Soya unu örneklerinde üreaz etkinliği, kanatlı yemlerinde ise toplam yağ ve peroksit değeri yönünden analiz yapılmıştır. 30°C'de inkübasyon sonucunda açığa çıkan amonyak azotunun nötralize edilmesiiçin harcanan 0.1 N hidroklorik asit hacminin ölçülmesi esasınadayanmaktadır;buna göre, örneklerin üreaz etkinliğinin 0.02-0.73 L.pH arasında belirlenmiştir. Toplam yağ ölçümü için, yemlerdeki yağ sokselet ekstraksiyon tekniği kullanılmıştır. Örneklerdeki toplan1 yağ içeriği %0.8-15 .6, peroksit değeri ise 1.4-42 mEq/kg olarak belirleruniştir. Örneklerde belirlenen üreaz etkinlik düzeyleri ve peroksit miktarlarının değerlendirilmesiyle, ülkemizde yem sanayii ve böylece tavukçuluk sektörünün belli ölçüde ama sürekli şekilde kalitesiz-acılaşmış yağ ve yeterince işlemnemiş soya fasulyesi unu kullanmakta olduğu sonucuna varılmıştır.

In this study, it was aimed to acl1ieve the urease activity in soybean meals samples which were imported or produced in Turkey and the total oil content with their peroxide values in poultry feeds . Of this, total 396 samples that 110 of them are soybean meal and 286 of them are poultry feeds were provided from 48 feed factories which are found at seven region of the Turkey in the years of April 1993-April 1995 . Determ"ination of the urease activity levels in soybean meal samples were based to cletennine volume of 0.1 N HCl exerted to notralize the ammonium nitragen which is ariesed after ineubatian at 30°C, in return for urea added in one gram soybean meal. According to this, it -vvas determin Kaynakça ABDELGADIR, I.E.O., MORRILL, J.L., STUTTS, J .A., MORRILL, K.C., JOHNSON, D.E. AND BEHNKE, K.C. (1984) . Effect of processing temperature on u tilisation of who le soybeans by calves. J. Dairy Sci. 67:2554-2559. ALMQUİST, H.J. AND MERRİTT, J.B. (1952). 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