Studies on Herpesvirus scophthalmi infection of turbot Scophthalmus maximus (L.): Histopathological observations

Abstract. The histological features of the disease caused by infection of turbot by Herpesvirus scophthalmi are described. Infection of epidermal cells of skin and gill resulted in the formation of giant cells showing a variety of nuclear and cytoplasmic changes associated with the replication of the virus. The effects of the condition together with possible control measures are discussed.     

Occurrence of cataracts in triploid Atlantic salmon (Salmo salar) on four farms in Scotland.

In September 1991 cataracts occurred in two year-classes of triploid Atlantic salmon. The fish showed varying degrees of blindness, were lethargic and became emaciated owing to their inability to feed. The lesions in the lens were mainly in the anterior and posterior cortex and perinuclear areas, the capsule and embryonic nucleus remaining unaffected. Diploid fish of the same year-class did not have cataracts. The origin of the triploid fish, the method of triploidisation, their diet and disease status were investigated, but no predisposing factors could be found to account for the high incidence of cataracts.     

Lymphoid neoplasia in the koala

Objective Correlation of immunophenotype with history, anatomical and morphological features of lymphoid neoplasia in the koala.
Methods Routine necropsies were performed on 51 koalas with suspected lymphoid neoplasia between 1986 and 1997 in New South Wales and Queensland. Immuno-phenotyping was by an immunoperoxidase method utilising species cross-reactive antibodies raised against human lymphocytes and an antibody raised against koala IgG. Cases were classified according to organs and tissues affected and the morphological features of neoplastic cells.
Results Twenty-six (51%) of the cases were of the T cell immunophenotype, 12 (24%) were of B cell immunopheno-type and 13 (25%) did not stain. The age and sex of koalas did not correlate with immunophenotype (P = 0.686 and P = 1.000, respectively). Thirty-two cases were leukaemic and 36 had multiple organ involvement, probably reflecting presenta tion of koalas at advanced stages of disease. Abdominal tissue involvement was most common (44 cases), followed by nodal (32), atypical (21) and cervicomediastinal (14). The T cell immunophenotype was over-represented among the leukaemic cases (P = 0.013). Generally, the T cell immunophenotype predominated except for many affected atypical tissues. Neoplastic cells were mostly of medium nuclear size with round to oval nuclei. No correlations were found for cell morphology, mitotic index and immunopheno-type.
Conclusion The prognostic value of an immunopheno-typic, anatomical and morphological basis for the classifica tion of lymphoid neoplasia in the koala currently is limited by the need to detect these neoplasms at an early age, the requirement for freshly fixed tissues and the restricted range of available cross-reacting antibodies.     

Blood bactericidal assay (Pasteurella haemolytica) comparison of morbidity in marketed feeder calves

An in vitro bactericidal assay that used bovine heparinized blood was investigated for its usefulness in detecting differences in the bactericidal immunity of calves against Pasteurella haemolytica serotype 1 (Ph1). Greater than 90% of killing occurred within 30 minutes. The substitution of fetal calf serum for autologous calf plasma caused loss of bactericidal activity of the blood. Decomplemented calf serum also was low in bactericidal activity. The blood bactericidal assay appears to be opsonin antibody-dependent and complement-dependent. The coefficient of variation (CV) that can be expected with this assay was established by use of a group of 8 calves; within-day CV maximum was 0.9, and between-day CV maximum was 2.1. The blood bactericidal assay was used to evaluate 30 calves under typical market stress from 4 farms in eastern Tennessee. All calves had decreased bactericidal activity, as they moved into a feedyard in Texas. The bactericidal activity was reduced among sick calves, based on the severity of clinical signs. Morbidity was highest during the first 14 days in the feedlot. During this period, healthy calves had a decreased bactericidal index (BI) of 4 points, and calves with clinical signs of bovine respiratory tract disease for 3 days had a decreased BI of 8 points. The average reduction in the BI of calves with clinical signs of bovine respiratory tract disease for 6 or more days was 14 points.     

The 2006 American Association of Feline Practitioners Feline Vaccine Advisory Panel report

Vaccination is a medical procedure, and the decision to vaccinate should be based on a risk-based assessment for each cat and each vaccine.     

Feline vaccination guidelines.

The 1998 Report of the American Association of Feline Practitioners and Academy of Feline Medicine Advisory Panel on Feline Vaccines was developed to help veterinary practitioners formulate vaccination protocols for cats. The current panel report updates information, addresses questions, and speaks to concerns raised by the 1998 report. In addition it reviews vaccine licensing, labeling, and liability issues and suggests ways to successfully incorporate vaccination protocol changes into a private practice setting.     

Effect of high daytime temperatures on the intake and utilisation of water in lactating Friesian cows

Summary Four primiparous Friesian cows in mid-lactation and housed in climate chambers were simultaneously exposed to three sequential climate treatments: 1, a three-week period in a thermoneutral environment (ambient temperatureT _a 14–21°C and relative humidity r.h. 60–70%); 2, a similar period during which they were exposed toT _a max. 38°C/r.h. max. 80% for up to 7h andT _a 14–21°C/r.h., 60–70% for 17h each day; and 3, a three-week period during which they were subjected once more to the thermoneutral conditions described for 1. Water and a complete feed were constantly available. Compared with water intake (drinking water+feed water) under thermoneutral conditions cows exposed to treatment 2 significantly increased their mean intake by 12.2%; in three cows, this involved a phase-shift of >20% in drinking habits from day (hot) to night (cool) time. Water balance trials conducted at the mid-point of each treatment revealed that the mean losses of water via urine, faeces, milk, sweat and saliva as a percentage of water intake changed significantly resulting in a net gain (retention) of body water. An accompanying significant increase in live weight despite a 9.1% decrease in DM intake during treatment 2 confirmed the water retention results. On return to thermoneutral conditions (3), the cows exhibited a marked weight loss and a significant increase in urinary water excretion over treatment 1 and 2 values, signifying that a large proportion of the water retained during 2 was of extracellular origin. A positive correlation was found between the severity of the clinical and behavioural responses of the individual cows during 2 and their retention of water.

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Resumen Cuatro vacas Friesian primíparas, en la mitad de la lactancia, fueron expuestas en cabinas climáticas a tres tratamientos diferentes consecutivos: I—a un período de tres semanas en un ambiente termoneutro (temperatura ambiente, Ta 14–21°C y humedad relativa HR 60–70%); II—durante período similar, fueron expuestas a una Ta máxima de 38°C/HR máxima de 80% por siete horas y Ta 14–21°C/HR 60–70% por diecisiete horas cada día; y III—durante un período de tres semanas fueron sometidas otra vez a las condiciones termoneutras descritas en el tratamiento I. Agua y un alimento completo estuvieron siempre a disposición. Comparado con el consumo de agua (agua de bebida+agua de alimento) bajo condiciones termoneutrales, las vacas sometidas al tratamiento II incrementaron significativamente su consumo medio en un 12.2%; en tres vacas esto significó un cambio de >20% en hábitos de bebida, del día caluroso a la noche tibia. Los ensayos de balance de agua conducidas en la mitad de cada tratamiento, revelaron que las pérdidas medias de agua via orina, heces, leche, sudor y saliva, como porcentaje del agua ingerida cambió significativamente, resultando en una ganancia neta (retención) de agua corporal. Se observó tambien un incremento significativo en peso vivo de 16.8±7.3 (SE) kg/animal, a pesar de la disminución de 9.1% en la igestión de MS durante el tratamienta II, confirmando así la retención de agua. Bajo condiciones termoneutrales (III), las vacas exhibieron pérdida marcada de peso y un incremento significativo en la exreción de agua, sobre los valores de los tratamientos I y II, indicando así que una proporción alta del agua retenida durante II fue de origen extracelular. Se encontró tambien una correlación positiva entre la severidad de las respuestas clínicas y de conducta de las vacas individuales durante II, con la retención de agua.

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Résumé Quatre vaches frisonnes primipares, à mi-lactation et logées dans des chambres climatisées ont été simultanément exposées à 3 traitements climatiques séquentiels: I. une période de 3 semaines dans un environnement thermique neutre (température ambiante, Ta 14–21°C et humidité relative, HR 60–70 p. 100); II. une période similaire pendant laquelle elles étaient exposées à Ta max. 38°C/HR max. 80 p. 100 pendant sept heures et à Ta 14–21°C/HR 60–70 p. 100 pendant dix sept heures chaque jour; et III une période de 3 semaines pendant laquelle elles étaient de nouveau soumises aux conditions thermiques neutres décrites en I. L'eau et un aliment complet étaient constamment disponibles. Par comparaison avec leur absorption totale d'eau (abreuvement plus eau de constitution des aliments) dans des conditions thermiques neutres, les vaches soumises au traitement II ont augmenté significativement leur absorption moyenne de 12,2 p. 100: chez 3 vaches, ceci a entra?né un décalage dans le temps supérieur à 20 p. 100 de l'absorption diurne (période chaude) à l'absorption nocturne (période fra?che). Des essais d'équilibre hydrique effectués au milieu de chaque traitement ont révélé que les pertes moyennes en eau par les urines, les fèces, le lait, la sueur et la salive, en tant que pourcentage de l'eau absorbée changeait de fa?on significative, ce qui s'est traduit par un gain net (retention) d'eau corporelle. Une augmentation significative concommittante du poids vif de 16,8+7,3 (SE) kg par animal, en dépit d'une diminution de 9,1 p. 100 de l'ingestion de MS pendant le traitement II a confirmé les résultats de rétention d'eau. De retour aux conditions thermiques neutres (III) les vaches ont montré une perte de poids marquée et une augmentation significative de l'excrétion d'eau urinaire, par rapport aux valeurs relevées pendant les traitements I et II, ce que signifie qu'une grande proportion de l'eau retenue au cours du traitement II était d'origine extracellulaire. Une corrélation positive a été observée entre la gravité des réponses cliniques et de comportement des individus en II et leur rétention d'eau.

     

The effects of limb posture on relationships between in vitro radial hoof strain,load and joint angles

Reasons for performing study: Radial strain in normal hooves has been found to vary with strain gauge location, limb posture and sample limb but reported magnitudes were considered to be low. More accurate measurement of radial strain may enhance the understanding of hoof function. Objectives: To explore in vitro radial hoof strain in relation other kinetic and kinematic variables that may be related. Methods: Five normal forelimbs were removed at the proximal articular surface of the third metacarpal bone (McIII). The limbs were loaded using a modified Instron test machine. Six calibrated infrared cameras captured movement from markers on the hoof and bone fixed markers on the second and first phalanxes and McIII, whilst radial hoof strain was measured using a calibrated instrumented plug. Change in strain, joint angle and load were found at simulated walking postures and bivariate correlations were used to compare the relationships between them. Results: Radial strain was moderately correlated with proximal interphalangeal joint (PIPJ) rotation (r =?0.519). Large reductions in radial strain were found in loading and midstance with 10° of heel lift postures. Conclusions and potential relevance: PIPJ rotation has previously been linked to the magnitude of deep digital flexor tendon (DDFT) loads and it is therefore suspected that these loads may have the greatest influence on radial strain magnitudes. Further investigation of radial strain is needed to describe the patterns fully during the stance phase in vivo.