Scientist Profile


Rio John T. Ducusin

Veterinary Science, Outstanding Young Scientist (2004)

Expertise: Bioactive Medicine , Chemistry

Dr. Rio John T. Ducusin is recognized of his significant contributions to the field of veterinary internal medicine specifically by developing a simplified method for measuring phagocytosis in which the relationship phagocytosis and intra- and extra-cellular calcium ions under natural conditions of parturient paresis in cows have been clarified. This method is also used in exploring the feasibility of using alternative form of medicine in ruminants: the ozone therapy. His accomplishments as a research scientist have contributed significantly to the advancement of animal production and medicine, and animal diagnosis.


Research Scientist, College of Veterinary Medicine, UPLB

Scientist, International Rice Research Institute, College, Launa


    • Gamma Sigma Delta Honor Society of Agriculture, Member
    • Philippine Veterinary Medical Association (PVMA), Member
    • Philippine Society of Animal Science (PSAS), Member
    • Pi Gamma Mu International Honor Society of Social Science, Member
    • Phi Sigma Biological Honor Society, Member
    • Phi Kappa Phi Honor Society, Member


    • University of the Philippines at Los Banos, Instructor, 1987 Je- 1988 Ja
    • UPLB, Instructor II, 1988 F- 1992 O
    • UPLB, Instructor V, 1992 N-1993 My


    • Outstanding Young Scientist Award (Veterinary Science), NAST, 2004
    • International Publication Award, University of the Philippines System, 2001
    • Best Paper Award (with Maala, C.P. J.L.L. Castro Jr., and L.J. Querubin), 34th Philippine Society of Animal Science Annual Convention, PICC, O 1997
    • Recipient, UPLB Diamond Jubilee Professorial Chair Award, UPLB, 1995 and 1996
    • Outstanding Young Professional in Animal Science Award, PSAS-UNIVET, 1994
    • Best Paper Award ( with B.P. Divina, A.T.N. Ballesteros and F.B. Javier-Diaz), 31st Philippine Society of Animal Science Annual Convention, Century Park, Sheraton Hotel, Manila, 1994 N
    • Recipient, UPLB Diamond Jubilee Faculty Grant, UPLB, 1992
    • Recipient, Japanese Ministry of Education, Culture and Sports (Monbusho) Fellowship, Monbusho, 1990-1991
    • Class Valedictorian, UPCVM Class of 1987, UP, 1987
    • Drs. E.S. Sarmiento and L.R. Uyenco Award in Veterinary Medicine, , Ap 1987
    • Professor Jose Q. Solis Memorial Award in Veterinay Anatomy, , Ap 1987
    • International Honor Society of Phi Kappa Phi Award, , Mr 1987
    • Phi Sigma Biological Honor Society Award, , Mr 1987


    • A Study of Some Blood Chemistry Values in Infertile and Normal Cyclic Cows in Selected Dairy Farms [Completed]
    • A Case of Hog Cholera in Vaccinated Swine (Case Report) [Completed]
    • Clinicopathologic Findings of Intraepididymal Injection of 10% Formalin in Sexually Mature Goats (Capra hircus) [Completed]
    • The Effects of a Commercial Toxin Binder on Broiler Growth Performance [Completed]
    • A Suspected Case of Acetonemia in a Dairy Cow (Case Report) [Completed]
    • A Preliminary Study on the Clinical Effects of Azaperone and Chlorperidol on Carabaos (Bubalus bubalis) Raised in the Philippine Carabao Centre [Completed]
    • A Preliminary Field Study on the Effects of a Digestive Enzyme (Fradiase) on the Average Daily Gain and Feed Convertion Ratio of Broilers [Completed]
    • Inguinal Herniation of a Gravid Uterus in a Bitch (Case Report) [Completed]
    • Manipulation of the Oestrous Cycle in CFA Merino Ewes with Exogenous Progesterone and Oestradiol [Completed]
    • Mating Activity, Conception Rate, Fertility and the Incidence of Multiples in CFA Merino Ewes Treated with MAP Sponge and PMSG in June, July and August [Completed]
    • Superovulation and Ova recovery from CFA Merino Ewes-Dose Response to PMSG in Two Seasons [Completed]
    • Preliminary Studies on the Effects of Ozone on the Phagocytic Acvtivity of Canine and Bovine Neutrophils by Luminol-Dependent Chemiluminescence [Completed]
    • Immunologic Changes Observed in Ozone Therapy for the Treatment of Acute Bovine Mastitis [Completed]
    • Direct and Indirect Effects of Ozone Gas Administered In Vitro on the Phagocytic Activity of Canine Polymorphonuclear Leukocytes Using Flow Cytometry [Completed]
    • Effects of In Vitro Administration of Ozone Gas on the Nitroblue Tetrazolium (NBT)-Reduction Activity of Bovine Neutrophils [Completed]
    • Flow Sytometric Measurement of Phagocytosis of Bovine Milk Polymorphonuclear Leukocytes Using Flourescent Beads [Completed]
    • Preliminary Studiess on the Effects of Hydrogen Peroxide on the Phagocytic Activity of Canine and Bovine Neutrophils [Completed]
    • A Case of Calving Paralysis in a Dairy Cow (Case Report) [Completed]
    • Evaluation of the Ratio of the Placenta and Foal Birth Weight as a Means of Determining Viability and Performance of Foal [Completed]
    • Physiological and Hematological Effects of Xylazine Sedation in Carabaos (Bubalus bubalis) [Completed]
    • The Effects of a Hemodialysate (Solcoseryl) on Wound Healing in Cats [Completed]
    • Efficacy of Three Selected Herbal Plants on Gastro-intestinal Parasites of Cattle [Completed]
    • Esophageal Fistulation in Small Ruminants (Case Report) [Completed]
    • A Comparative Study of Two Commercial Growth Promotants (Zinc-Bacitracin and Halquinol) on Broiler Performance [Completed]
    • A Descriptive Study on Semen Values of a Brahman Bull and a Murrah Buffalo Bull Kept at National Artificial Breeding Center from 1988 to 1991 [Completed]
    • A Case of Gastric Dilatation and Volvulus in a Pug (Case Report) [Completed]
    • Ducusin Verminous Pneumonia in a Brahman Cow (Case Report) [Completed]
    • Retrospective Study on the Prevalence of Equine Infectious Anemia in Horses Tested at the National Stud Farm (1987-1995) [Completed]
    • Practices of Smallhood Swine Farmer in Response to Foot and Mouth Disease (FMD) in Selected Areas in Luzon [Completed]
    • Esophageal fistulation in sheep and goat using a locally-fabricated cannula [Completed]
    • A Performance of small ruminants (SR) grazing on native grassland (NG) overseeded with Centrosema [Completed]
    • Planned health program for small ruminant-coconut system:its effects and modifications [Completed]
    • A field study on the efficacy of ivermectin against gastrointestinal nematodes of sheep and goats following oral and subcutaneous administration [Completed]
    • Mineral profile and suplementation of small ruminants under coconuts [Completed]

Papers Presented

    • Recent Research Development in Buffalo Production, 2nd Asian Buffalo Association (ABA) Congress, Makati City


    • The United Graduate School of Veterinary Sciences, Gifu University (Obihiro University of Agricultur, Obihiro, Hokkaido, Japan, Ph.D. in Veterinary Medicine, 2003 Mr
    • University of Sydney, Sydney, New South Wales, Australia, Master of Agriculture, 1991 F
    • University of the Philippines Los Ba?os, College, Laguna, Doctor of Veterinary Medicine (cum laude), 1987 Ap


    • Ducusin, R.J.T., Uzuka, Y., Satoh, E., Otani, M., Nishimura, M., Tanabe, S., Sarashina, T.,, (2003) Effects of extracellular Ca on phagocytosis and intracellular Ca concentrations in polymorphonuclear leucocytes of postpartum dairy cows
    • Research in Veterinary Science Volume 75, No. 1
    • Ducusin, R.J.T., Nishimura, M., Sarashina, T., Uzuka, Y., Tanabe, S., Otani, M.,, (2003) Phagocytosis of bovine blood and milk polymorphonuclear leukocytes after ozone gas administration in vitro
    • Journal of Veterinary Medical Science Volume 65, No. 4
    • Sakai, H., Tsushima, Y., Nagasawa, H., Ducusin, R.J.T., Tanabe, S., Uzuka, Y., Sarashina, T., (2003) Cryptosporidium infection of cattle in the Tokachi District, Hokkaido.
    • Journal of Veterinary Medical Science Volume 65, No. 1
    • Ducusin, R.J.T., Sarashina, T., Uzuka, Y., Tanabe, S., Ohtani, M., (2001) Phagocytic response of bovine polymorphonuclear leukocytes to different incubation conditions and following exposure to some effectors of phagocytosis and different anticoagulants in vitro.
    • Canadian Journal of Veterinary Research Volume 65, No. 1
    • Tanabe, S. Ducusin, R.J.T. et al., (2002) Expression of mRNA of chemokine receptor CXCR4 in feline mammary adenocarcinoma.
    • The Veterinary Record Volume 151
    • Takahashi, K., Takahashi, E., Ducusin, R.J.T., et al., (2001) Changes in serum thyroid hormone levels in newborn calves as a diagnostic index of endemic goiter.
    • Journal of Veterinary Medical Science Volume 63, No. 2
    • Mori, F., Sawada, K., Watanabe, N., Ducusin, R.J.T., Tanabe, S., Uzuka, Y., Takahashi, J., Sarachina, T., (2001) Relationship between the incidence of displaced abomasums and feeding of cows in Tokachi District, Hokkaido, Northern Japan
    • Asian-Australasian Journal of Animal Sciences Volume 14, No. 1
    • Lapitan, R.M., del Barrio, A.N., Flor, J.A.C.G., Canaria, C., Lihat, T.S., Ducusin, R.J.T., Serrano, R.M.F., (1999) Growth performance of water buffalo crossbreds on a Napier grass based diet supplemented with concentrate and urea-molasses-mineral block (UMMB)
    • Philippine Journal of Veterinary and Animal Science Volume 25, No. 2
    • Maala, C.P., Castro, J.L.L. Jr., Ducusin, R.J.T., Querubin, L.J., (1998) The anatomy of the cecum and the effect of its surgical removal on fiber digestibility in sheep (Ovis aries)
    • Philippine Journal of Veterinary and Animal Sciences Volume 24, No. 1-2
    • Ducusin, R.J.T., Faylon, P.S., (1996) Gastrointestinal helminths of small ruminants in the Philippines
    • Sustainable Parasite Control in Small Ruminants, Proceedings of the Workshop. Bogor, Indonesia, ACIAR Proceedings No.74
    • Ducusin, R.J.T. Divina, B.P. Ballesteros, A.T.N. Javier-Diaz, F.B., (1995) Some physiological and hemotological values of sheep raised under Philippine conditions.
    • Philippine Journal of Veterinary and Animal Sciences Volume 21(1 & 2)
    • Ducusin, R.J.T., (1994) The small ruminant-coconut production system committee (member).
    • The Philippines Recommends for Sustainable Small-Ruminant-Coconut Production System (Technical Bulletin), Los Ba?os, Laguna, PCARRD
    • Ducusin, R.J.T,, (1994) Understanding veterinary research. Part II. Analysis and interpretation of results (Review article)
    • Veterinary Medicine Extension Updates II Volume 1
    • Masangkay, J.S. Ducusin, R.J.T. Momongan, V.G. Namikawa Escalada, R., (1993) Chronic toxic hepatitis in captive tamaraw (Bubalus mindorensis) (Case report)
    • Philippine Journal of Veterinary Medicine Volume 30
    • Molina, J. Faylon, P.S. Villar, E.C. Colico, A.B. Ducusin, R.J.T., (1993) Development of a health programme for small ruminant-coconut systems.
    • In Advances in Sustainable Small Ruminant-Tree Cropping Integrated Systems (ed. S. Sivataj, P. Agamuthu and T.K. Mukherjee) University of Malaya and IDRC, Kuala Lumpur
    • Ducusin, R.J.T. , (1993) Understanding veterinary research (Part I)
    • Research Methods Review Article (Vet Med Extension Updates) Volume I , No. 1
    • Maala, C. P. Domingo, R.D. Ducusin, R.J.T., (1989) The anatomy of the permanent and temporary cheek teeth of the Philippinne carabao
    • Philippine Journal of Veterinary Medicine Volume 26
    • Maala, C. P. Reyes, E.V. Ducusin, R.J.T., (1988) Some contributions to the anatomy of the arterial supply to the stomach of the goat
    • Philippine Journal of Veterinary Medicine Volume 25
    • Maala, C. P. Domingo, R.D. Ducusin, R.J.T., (1988) The anatomy of the permanent and temporary incisors of the Philippine carabao
    • Philippine Journal of Veterinary Medicine Volume 25
    • Maala, C. P. Bacani, R.V.D. Ducusin, R.J.T., (1987) An unusual origin of the ovarian arteries in a non-descript goat
    • Philippine Journal of Veterinary Medicine Volume 24
    • Ducusin, R. J. T Maala, C.P., (1987) The blood supply of the spiral colon in goats
    • Philippine Journal of Veterinary Medicine Volume 24