Effects of temperature and atmospheric moisture on the early growth of apple powdery mildew (Podosphaera leucotricha) colonies

Effects of four temperatures and nine water vapour pressure deficits on the early growth of apple powdery mildew colonies on young leaves inoculated with conidia were studied on potted apple rootstocks in controlled environment cabinets. The number of hyphae (germ tubes + primary and secondary hyphae) per colony, total hyphal length per colony and the length of time from inoculation to the first observation of secondary hyphae were recorded on the upper surfaces of stained preparations of leaves sampled at three intervals up to 60 h after inoculation. Analyses of variance of these variables describing colony growth revealed significant differences between treatments (temperature × vpd), with most (c. 61–79%) of the treatment effects due to temperature, as shown by regression analysis. The response to temperature (13–28 °C) was non-linear, with the optimum c. 22 °C. In contrast, there was no detectable trend in the response of colony growth to vapour pressure deficit (1.6–10.4 mmHg). The results suggest that the rate of development of young colonies depends more on temperature than on moisture stress.     

An isolation of Leptospira serotype Pomona from a domestic cat

Extract

Between November 1971 and July 1972, the gastro-intestinal tracts of 51 dogs and 47 cats of various age were examined for helminth parasites. The animals examined were unselected and had been submitted for autopsy following death from causes unrelated to parasitism. Most of the animals were pets, but included in the survey were some working dogs. All came either from the city of Palmerston North or its surrounding rural areas.     

Preliminary investigation of the effect of treating sheep during pregnancy with a vitamin A,D, E formulation on the incidence of vaginal prolapse

ABSTRACT

Aim: To determine if vitamin D₃ treatment reduced the incidence of vaginal prolapse in pregnant sheep on a North Canterbury sheep breeding property.

Methods: Pregnant ewes from a single farm were allocated to three treatment groups in May 2018. At this time, the first group (EarlyVitADE; n?=?512) received an I/M 1?mL dose of 500,000?IU/mL vitamin D₃, 60,000?IU/mL vitamin A, and 25?mg/mL vitamin E. This was repeated in July 2018, when the second group (LateVitADE; n?=?695) also received the same treatment. The third group (n?=?737) were untreated controls. All cases of vaginal prolapse on the property were recorded from pregnancy diagnosis in June 2018 until ewes were set-stocked in August 2018. The planned start of lambing was 10 August 2018.

Results: During the period of observation, vaginal prolapses were recorded in 3/699 (0.4%) 2-year-old ewes, and the odds of vaginal prolapse were not associated with treatment group in these ewes (p?>?0.3). Amongst ewes aged ≥3 years, during the same period, there were 6/333 (1.8%), 6/443 (1.4%) and 25/469 (5.3%) cases in the EarlyVitADE, LateVitADE and control groups, respectively. Compared to control ewes, the odds of vaginal prolapse were reduced in both the EarlyVitADE (OR?=?0.37; 95% CI?=?0.15–0.92) and LateVitADE (OR?=?0.25; 95% CI?=?0.10–0.62) treatment groups.

Conclusions and clinical relevance: In this preliminary study, administration of injectable vitamins A, D₃, and E to pregnant ewes reduced the incidence of vaginal prolapse during the period from pregnancy diagnosis to set-stocking on one North Canterbury hill-country farm. Due to the restricted data collection period, this investigation should be replicated to better quantify the repeatability of the observed treatment effect over the complete lambing period.     

Canine rheumatoid arthritis—a review and a case report

The literature on canine rheumatoid arthritis is reviewed and current concepts of its aetiology in man and animals discussed. A case of polyarthritis in a young male Shihtzu is presented. Moderate titres of rheumatoid factor were found, and radiographie changes similar to those occurring in classical rheumatoid arthritis in man were noted.
Résumé. Observation d'un cas de myélome multiple chez une chienne bâtarde de 3 ans. Le diagnostic a été fait d'après les données histopathologiques après autopsie. La tumeur formait des masses nodulaires au niveau de la 4éme cóte gauche et des vertèbres L 3 et L 4; elle intéressait aussi les ganglions lymphatiques parasternaux, la rate, le foie et les reins. La présence de dépóts amyloïdes dans le rein n'apportait aucun renseignement complémentaire.
Zusammenfassung. Diese Abhandlung beschreibt einen Fall von multiplem Myelom bei einer 3 Jahre alten Bastardhündin. Die Diagnose beruhte auf der histopathologischen Untersuchung von Autopsiematerial. Der Tumor bildete nodulare Massen an der vierten Rippe links und am dritten und vierten Lendenwirbel; er involvierte auch die sternalen Lymphknoten, Milz, Leber und Nieren. Der Nachweis von Amyloidablagerungen in der Niere war nicht überzeugend.     

The relationship between the prevalence of uterine lesions and the use of medroxyprogesterone acetate for canine population control

SUMMARY The prevalence of uterine disease was established during desexing of 175 bitches in the Torres Strait and Cape York, 42 of which had been treated with injectable medroxyprogesterone acetate (MPA) for oestrus postponement. The prevalence of uterine lesions was 45% for treated bitches, 5% for untreated bitches, and 14.9% for the sample population. A highly significant relationship (P<0.01) between MPA treatment and uterine lesions was established. A significant association (P<0.05) between age (>2 years old) and uterine lesions was found, most likely attributable to a significantly higher proportion (P<0.01) of MPA-treated bitches in the older population. There was no significant difference in the effect of MPA on the prevalence of uterine lesions between older and younger bitches. There was no effect of parity on the prevalence of uterine lesions.     

The effect of delays in feeding colostrum and the relationship between immunoglobulin concentration in the serum of neonatal calves and their rates of growth

SUMMARY Eighty-five unsuckled newborn calves, were fed 1.5 L of colostrum of known IgG concentration at either 2, 4, 6 or 8 hours after birth with no additional colostrum feeding. Another group of 11 calves were left with their dam for 16 hours after birth, before separation. Blood samples were taken from all calves 24 hours after colostrum feeding or separation from the dam and serum Ig concentrations were measured by electrophoresis. There were no significant differences in mean serum Ig concentrations between calves fed at the different times after birth. Three of the 11 calves left to suckle were hypogamma-globulinaemic. Other calves in this group had higher serum Ig concentrations than the means of all other groups. All groups had mean serum Ig concentrations higher than the suggested minimum concentration required for adequate calf health. There were a number of calves that did not reach the suggested minimum serum concentration after feeding, but calf mortality was low and all calves were healthy apart from a slight scour for a few weeks after birth. There was no significant relationship between serum Ig concentration 24 to 48 hours after birth and either calf mortality or average growth rate over an 8- to 10-month period.     

Encephalitic listeriosis in two adult llamas (Lama glama): clinical presentations, lesions and immunofluorescence of Listeria monocytogenes in brainstem lesions

Encephalitic listeriosis was diagnosed in 2 adult llamas. Both had a multifocal suppurative encephalitis with mixed lymphocytic and neutrophilic perivascular infiltrates. Listeria monocytogenes was cultured from the brain stem of 1 llama using cold enrichment techniques; the other llama was culture negative. Formalin-fixed and paraffin embedded sections of brainstem lesions from both affected animals were labeled with a fluorescein-conjugated, anti-L. monocytogenes antibody. Using this technique, intralesional L. monocytogenes were identified in both llamas.