Intradermal tests as an aid to the diagnosis of skin disease in dogs

The diagnosis and treatment of skin disease form a major part of the small animal practitioner's work. A significant number of cases will be allergic in nature and may present difficulties in diagnosis. In man, skin testing for allergy is an established aid to diagnosis, but has been little used by the small animal veterinarian; published results are few. This paper is a preliminary report of the results of skin tests using allergens on normal and allergic dogs. It is considered that the method is of value as an aid to the diagnosis of flea hypersensitivity, but that the preliminary results using other allergens are inconclusive. Résumé. Le diagnostic et le traitement de dermatoses constituent une partie importante du travail du vétérinaire spécialisé dans le traitement d'animaux domestiques. De par la nature allergique d'un nombre considérable de cas, leur diagnostic peut poser des problèmes. Chez l'homme, les essais dermiques pour déterminer l'allergie sont reconnus comme facilitant le diagnostic; les vétérinaires, toutefois, n'y ont pas souvent recours et rares sont les résultats publiés dans ce domaine. Cette communication est un rapport préliminaire des résultats qu'ont fournis les essais dermiques en usant des allergènes chez des chiens normaux et ailergiques. On estime que la méthode a de la valeur en ce sens qu'elle aide à établir le diagnostic de l'hypersensibilité aux puce, mais que les résultats préliminaires avec d'autres allergènes sont peu concluants. Zusammenfassung. Die Diagnose und die Behandlung von Hautkrankheiten stellen einen grossen Teil der Arbeit des praktkchen Tierarztes dar. Eine nicht unbedeutende Zahl von Fällen wird allergischer Natur sein und kann diagnostische Schwierigkeiten bieten. Beim Menschen ist die Prüfung der allergischen Reaktion der Haut ein anerkanntes Mittel der Diagnose, das jedoch in der tierärztlichen Praxis wenig angewendet wurde, und auch Veröffentlichungen über die Ergebnisse sind selten. Die vorliegende Arbeit ist ein vorläufiger Bericht über die Ergebnisse von Hauttests unter Verwendung von Allergenen an normalen und allergischen Hunden. Man darf annehmen, dass die Methode einen Wert als diagnostisches Hilfsmittel im Falle der Überempfindlichkeit gegen Flöhe besitzt, dass die vorläufigen Ergebnisse der Verwendung anderer Allergene aber nicht eindeutig sind.     

Evaluation of age of dam effects on maternal performance of multilactation daughters from high- and low-milk EPD sires at three locations in the southern United States

Angus bulls (n = 16) selected for either high- or low-milk EPD but similar growth EPD were mated within location at random to Angus cows. Daughters were bred to calve at 2 yr of age and annually until 6 yr of age. Milk yield was measured four times during lactation with a portable milking machine to estimate 12-h milk yield. Milk was collected for analysis of the percentage of fat and protein. A mixed model procedure was used to analyze the weaning weight, milk yield, and milk component data. The model for weaning weight included location, genetic line of sire, gender of calf, and age of dam. Calf age at weaning was used as a covariate. The model for the milk yield and components included location, genetic line of sire, gender of calf, period, and age of dam. Random effects for all models included sire of dam nested within line, sire of calf, and year. Genetic line was a significant source of variation for milk yield (P < 0.01) and weaning weight (P < 0.01) but not for percentage of fat or protein. Location was significant for milk yield (P < 0.01), fat (P < 0.01), protein (P < 0.01), and weaning weight (P < 0.01). The interaction of line with location was not significant except for percentage of protein (P < 0.01). Age of dam was significant for milk yield (P < 0.01), weaning weight (P < 0.01), and percentage of protein (P < 0.01), but not for percentage of fat (P = 0.29). Line difference for mean weaning weight was 18.1 kg, which is similar to the difference between lines for milk EPD (19 kg). Weaning weights from high-milk EPD line daughters were heavier (P < 0.01) than low-milk EPD line daughters at each age of dam evaluated. Cows nursed by males had higher milk yields (4.33 kg/12 h) than cows nursed by heifers (4.0 kg/12 h). The difference in yields for gender was significant for 2-, 3-, and 5-yr-old cows, but not for 4- (P < 0.052) and 6-yr old (P < 0.15) cows. Correlation coefficients between weaning weight and weaning EPD, milk EPD, and total maternal EPD were greater than zero (P < 0.01) (0.76, 0.65, and 0.89, respectively). Daughters of sires with high-milk EPD produced more milk at each age and weaned heavier calves than daughters of sires with low-milk EPD. These results confirm the value of milk EPD for improvement of weaning weights in beef cattle and also validate age of dam effects on milk yield and the associated effects on weaning weights.