Melanomas are malignant neoplasms originating from melanocytes. They reported in birds.  In this  case, macroscopic and microscopic (the histopathologic and IHC) findings supported a final diagnosis  of cutaneous malignant melanoma in a mallard duck (Anas platyrhynchos). A female mallard duck  (Anas platyrhynchos) was observed with a mass on the ventral portion of the neck. Th...

Hematologic parameters were studied in giant Canada geese (Branta canadensis maxima), mallard ducks (Anas platyrhynchos platyrhynchos) and various species of diving ducks at seasinal intervals throughout the year. Highest values for packed cell volume, hemoglobin content and erythrocyte counts were found in the winter and pre-nesting periods. Mean corpuscular volume and mean corpuscular hemoglo...

BACKGROUND: Protozoa are common in poultry and otherbirds and can cause mild to severe disease. OBJECTIVES: Thisstudy was concerned with the prevalence of parasitic protozoa inwild waterfowl in Caspian sea lagoons in the North of Iran.METHODS:Atotal of 293 waterfowl belonging to various generaincluding Tadorna tadorna (common shelduck),Aythya fuligula(Tufted duck), Aythya ferina (Common puchard...

In this study, twelve Mallards living in an artificial wastewater wetland were exposed to treated wastewater containing 1 x 104 x 10 enterococci 100 ml for a period of 55 days. Faecal samples were collected before, during and after exposure and analysed for Enterococcus spp. The isolates were phenotyped using the PhenePlate system. 270 Enterococcus spp. of Mallard origin were analysed, together...

Mallard (Anas platyrhynchos) duckling survival is an important, but not well understood, component of reproductive success for the species. To further investigate how mallard duckling survival is related to hatch date and wetland density, we analyze duckling counts for broods in southwestern Manitoba during the late 1980’s. Various models are explored to explain the patterns in the observed dat...

Embryotoxicity of the oil dispersant Corexit 9500 was examined using fertilized mallard duck eggs. Corexit 9500 was topically applied below the air cell to eggs in volumes ranging from 0 to 100 μL on day 3 of incubation. The highest incidence of mortality occurred at developmental stage 4, one day post-Corexit 9500 application. Hatching success was significantly decreased among eggs treated wit...

Divergencia de coloración en las subespecies del Pato Colorado (Anas cyanoptera) de Norteamérica y Sudamérica.

The outbreak of Riemerella anatipestifer (RA) infection has been confirmed in meat-type domestic ducks (Anas platyrhynchos) for the first time in 27 years in Japan. In January 2014, increased mortality in a 14- to 21-day-old duck flock was reported to veterinary officials by the owner. The affected ducks exhibited reduced movement, ataxia and dorsal recumbency with leg paddling. Pathological fi...

Paul Merola of the Connecticut DJLP. for allowing access to hunter-killed ducks. Many thanks to Beth Wingate-Ehrhorn for help with everything.