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418MARTÍ, A. • MOLINA, P. • DÍAZ, J.R. & PERÍS, C.CONCLUSIONESLa actividad de la plasmina y el contenido en proteosas-peptonasse vieron incrementadas tanto porel efecto de la infección mamítica como por elaumento del recuento de células somáticas independientementede la infección, observándose diferenciassignificativas a partir de 200.000 células/ml enel caso de la actividad de la plasmina y de 1.000.000células/ml para la fracción proteosa-peptona. Estosugiere que en leches con un alto contenido celular,las enzimas procedentes de las células somáticaspueden presentar un papel más importante que laplasmina en la degradación de las proteínas.REFERENCIAS BIBLIOGRÁFICASANDREWS, A.T., 1979. The formation and thestructure of some proteose-peptone components.Journal of Dairy Research, 46, 215.COGAN, T.M., 1997. A review of heat resistant lipasesand proteinases and the quality of dairy products. Ir.Journal of Food Science Technology, 1, 95.DE RHAM, O.,ANDREWS, A.T., 1982. The roleof native milk proteinase and its zymogen duringproteolysis in normal bovine milk. Journal ofDairy Research, 49, 577.HARWALKAR, V. R., CHOLETTE, H., MCKELLAR, R. C., D. B. EMMONS, R. C., 1993.Relation between proteolysis and astringent offflavorin milk. Journal of Dairy Science, 76,2521.HUMBERT, G., 1986. La protéase alcaline (plasmine)du lait: dosage, purification et implications en technologielaitiere. These, Univ. Nancy I, France.HUMBERT, G., GUINGAMP, M.F., LINDEN, G.,1997. Method for the measurement of lipase activityin milk. Journal of Dairy Research, 64, 465.LE ROUX, Y., COLIN, O., LAURENT, F., 1995.Proteolysis in samples of quarter milk with varyingsomatic cell counts. 1. Comparison of someindicators of endogenous proteolysis in milk.Journal of Dairy Science, 78, 1289.MARTI, A., LE ROUX, Y., LAURENT, F., 1998.Quality of protein in goat half-udder milk with varyingsomatic cell count levels. Procedings of the VISymposium of milking of small ruminants. Ayhenes26 Sept.-1 Oct. (Enviado para su publicación).MIRANDA, G., AND J.C. GRIPON., 1986. Origine,nature et incidences technologiques de laprotéolyse dans le lait. Lait, 66, 1.MURPHY, S.C., CRANKER, K., SENYK, G.F.,BARBANO, D.M., SAEMAN, A.I., GALTON,D.M., 1989. Influence of bovine mastitis onlipolysis and proteolysis in milk. Journal of DairyScience, 72, 620.PERIS, C., DIAZ, J.R., FERNANDEZ, N., RODRI-GUEZ, M., 1996. Effect of subclinical mastitison milk yield in Manchega ewes: preliminaryresults. En: Somatic cells and milk of small ruminants.EAAP, 77, 203.POLITIS I., NG-KWAI-HANG, F., 1988. Effectsof somatic cells count and milk composition onthe coagulation properties of milk. Journal ofDairy Science, 71, 1740.ROMEO, M., ESNAL, A., GONZALEZ, L.,JUSTE, R.A., MARCO, J.C., 1993. Ovine Mastitis:relationship between somatic cell count, milkyield and composition. Third international sheepveterinary conference. Edinburgh.ROWLAND, S. J. 1938. The precipitation of theproteins in milk, I caseins, II total proteins, IIIglobulin, IV albumin and proteose-peptone.Journal of Dairy Research, 9, 30.SAS ‚ User Guide Statistics. Version 6.12. Edición1996. SAS Institut, Cary, NC.