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A merganser die-off associated with larval eustrongylides
A die-off of red-breasted mergansers on Lake Holly, Virginia Beach, Virginia, was found to be due to a larval Eustrongylides. Massive tissue destruction and hemorrhage was produced by the migration of the larval Eustrongylides. Earlier stages of the same Eustrongylides were found in eastern mosquitofish and silversides upon which the mergansers had been feeding. In addition, residues of DDT were found in mosquitofish, gizzard shad, and five mergansers collected from Lake Holly, and in the tissues of two mergansers from Back Bay, Virginia. However, the information available was insufficient to establish the significance of these residue levels.
Multicentric neurofibrosarcoma in a Canada goose, Branta canadensis
No abstract available.
Subinoculation as a technique in the diagnosis of avian plasmodium
In two successive years, 1964 and 1965, blood subinoculated from wild Canada geese, negative for Plasmodium by examination of peripheral blood smears, into 5-day-old domestic geese produced 60 % infection in the recipients. Prepatent and patent periods, as well as intensity of parasitemia showed much variation. Intramuscular inoculation produced the same prevalence as the intravenous route, but longer prepatent periods and less intensity of parasitemia.
Rapid dosing of food pellets in toxicological studies with birds
No abstract available.
Lead poisoning in Canada geese in Delaware
Trainer and Hunt (9) stated that lead poisoning of Canada geese ( Branta canadensis ) had been reported from three states: North Carolina, Indiana, and Wisconsin. More recently, the Mississippi Flyway Council (8) cited suspected cases of lead poisoning of Canada geese in Massachusetts, New York, Pennsylvania, Delaware, Virginia, and Maryland. Hanson and Smith (6) also cited cases in widely separated areas of the country, including Texas and Michigan. this paper reports lead poisoning among Canada geese in Delaware, and presents evidence that it is a recurring problem among wintering flocks of Canada geese along the Middle Atlantic Coast.
Effect of Hygromycin-B on pigeons (Columba livia) with and without Trichomonas gallinae
Hygromycin-B was administered in varied quantities to pigeons harboring nonvirulent Trichomonas gallinae and to pigeons free of T. gallinae. Both groups responded identically with large yellow caseous lesions in the upper digestive tract which superficially resembled canker (trichomoniasis). No mycotic association with the lesions could be established in either .group from sections stained with periodic acid-Schiff. The lesions observed in Hygromycin-B-treated pigeons were concluded to be the direct result of the drug on the mucosa of the pigeon's upper digestive tract.
Ruptured-yolk peritonitis and organochlorine residues in a royal tern
Ruptured-yolk peritonitis was responsible for the death of a royal tern. Lodgment of eggs in the oviduct was probably due to reverse peristalsis brought about by breakage of the thin-shelled eggs and secondary bacterial infection. The thin shells were apparently not related to the low levels of DDE and other organochlorine pollutants found in tissues and egg contents.
Duck viral enteritis: A comparison of replication of CCL-141 and primary cultures of duck embryo fibroblasts
No abstract available.
Duck plague virus replication in Muscovy duck fibroblast cells
Duck embryo fibroblast cell cultures from seven species of ducks were compared for virus yield, plaque quality, and sensitivity to infection by the duck plague herpesvirus (duck virus enteritis). Muscovy duck and wood duck cells gave the best results for virus yield and plaque quality, but muscovies were considered superior because they are more available than wood ducks. Pintails and lesser scaup gave the poorest results, and pekin duck, black duck, and redhead duck were intermediate. A growth curve for the virus, determined in muscovy cells, had a latent period of six hours and a maximum new virus titer reached at 36 hours. Because of their superior plaque production and ability to replicate the virus, muscovy embryo fibroblasts (MCE) are recommended for diagnostic and research work.
Salmonella enteritidis and Arizona hinshawii isolated from wild sandhill cranes
Salmonella enteritidis serotype Rubislaw and Arizona hinshawii were isolated from cloacal swabs of "healthy" live-trapped sandhill cranes ( Grus canadensis tabida ) in Indiana and Wisconsin. These respective isolations were the first reported from wild sandhill cranes.
Brain lesions in mallard ducklings from parents fed methylmercury
Methylmercury dicyandiamide was fed to mallard ducks at 3 ppm mercury. Mercury accumulated in the eggs to an average of 7.18 and 5.46 ppm on a wet-weight basis in 2 successive years. Mercury in the eggs is believed to have caused brain lesions in the hatched ducklings. Lesions included demyelination, neuron shrink-age, necrosis, and hemorrhage in the meninges overlying the cerebellum. Brains of dead ducklings contained an average of 6.17 and 5.19 ppm mercury on a wet-weight basis in 2 successive years.
An outbreak of streptococcosis in eared grebes (Podiceps nigricollis)
An outbreak of streptococcosis ( Streptococcus zooepidemicus ), apparently the first recorded in wild birds, killed an estimated 7,500 eared grebes ( Podiceps nigricollis ) on Great Salt Lake (Utah) in November and December, 1977. Ducks and gulls feeding in the same area were unaffected.