The outbreak of saprolegniasis in the experimental clariid catfish (Clarias batrachus) was observed in the fish diseases laboratory. The spread of this fungal disease was very rapid. The mortality and morbidity were 45% and 90% respectively. The sand goby (Oxyeleotris marmoratus) was considered as the source of disease. The infection disappeared in 9 days after the initial detection of the moribund catfish. The clinical signs, pathological appearance and the characteristics of the causative fungi were described.

Three swamp buffalo bulls aged 1.5, 1.10 and 2 years were submitted to frequent blood sampling every 15 m within a period of 25 hrs. Plasma LH and testosterone were quantified by radioimmunoassay method. The levels of the 2 hormones in each individual exhibited episodic and nonrhythmic patterns. The number of LH peaks varied according to individuals ranging from no peak in one bull to 2 in the other 2 bulls. The mean concentrations during the period of study for each bull were 0.74, 0.33, and 1.17 ng/ml. Whereas the number of testosterone peaks varied between 1-10 and the average testosterone concentration were 0.1, 0.33 and 0.55 ng/ml for the younger to the older bulls respectively. The testosterone peaks related to LH peaks in each individual bull.

Some observations before, during and after parturition were reported in 20 swamp buffalo cows (Bubalus bubalis) all together. Preparturient changes concerning labia, pelvis and udder were described. The rectal temperature in one cow was recorded every morning and evening for 11 days before parturition. During parturition the appearance and the rupture of the fetal membranes were observed. The expulsion of the calf took 28 min. in average. The placenta was expelled 3 hours and 24 min. after the expulsion of the fetus.

Six outbreaks of Aujeszky's disease in pigs have been confirmed by the Department of Pathology, Faculty of Veterinary Science, Chulalongkorn University since December, 1977. The clinically ill piglets were submitted and diagnosed by several laboratory methods. F.A. tests applied on brain impression smears and cryostat tonsil sections were rapid and gave an accurate results. Taking more time, histopathology of brains, tonsils and other organs of the infected pigs and the rabbit inoculation with the isolated virus were found reliable to support the F.A. tests. In this study, 21 out of 22 piglets from the 6 outbreaks of Aujeszky's Disease had non-suppurative encephalitis associated with Cowdry tape A intranuclear inclusion bodies in nerve and glial cells. Focal necrosis on livers, lungs, spleens, lymph nodes and tonsils were common. Rabbits developed intense pruritus at the site of injection at 2-4 days after inoculation of the virus. Clinically, the affected pigs, in all 6 outbreaks, exhibited nervous and respiratory signs and the pregnant swine had a high rate of abortions during the outbreaks.

Culture of the giant freshwater prawn in three different systems were comparatively studied. These culture systems are: 1) a large earthen pond; 2) nylon cages submerged in an irrigation canal; and 3) a longitudinal ditch located in an orchard. Each culture system was initially stocked with juvenile prawns at 5 prawns/m2. The prawns were fed with a compound diet at the same ratio for the experimental period of six months. The results showed a significant difference on growth among these three systems. The prawns reared in cages exhibited the poorest growth while those of the other two systems exhibited better and comparable growth. Nevertheless, the prawn reared in cages showed the best survival (52.5%). Survival of prawn reared in the earthen pond and the longitudinal ditch were 48.0% and 35.2%, respectively. The yield per rai (0.16 ha) per crop (six months) of these three systems were 210 kg, 138 kg, and 74 kg, respectively. The factors affecting growth, survival, and production of the prawn are discussed.

A report of an outbreak of Aspergillus among 100,000 young chicks in a farm was presented. The mortality rate was 6 percent with pulmonary system, and about 4 percent were opthalmic lesions in either left or right side of the eye. The yellowish diphtheriatic membrane which is attached to the conjunctiva under the third eye lid contained numerous branching septated hyphae of Aspergillus fumigatus. Histopathological examination of the affected eyes revealed inflammation of the conjuctiva, third eye lid, choroid and iris. Abundance of mononuclear cells and heterophils were observed in the affected tissue. Opacity of the cornea showed evidence of edema, heterophils infiltration and ulceration. The upper part of the wing of the same side of the affected eye were wet and dirty due to deposition of tear and dust.