Second Broods in the Mallard Duck

The Auk ◽  
1934 ◽  
Vol 51 (1) ◽  
pp. 78-80 ◽  
Author(s):  
Paul L. Errington
Keyword(s):  
Mallard Duck

A model of the productivity of the mallard duck

1987 ◽  
Vol 38 (3-4) ◽  
pp. 257-275 ◽  
Author(s):  
Douglas H. Johnson ◽  
Donald W. Sparling ◽  
Lewis M. Cowardin
Keyword(s):  
Mallard Duck

Mallard Duck Built Nest in Tree Instead of Grass

1936 ◽  
Vol 29 (782) ◽  
pp. 214
Author(s):  
George A. Smith
Keyword(s):  
Mallard Duck

scholarly journals Population Genetics and Characterization ofCampylobacter jejuniIsolates from Western Jackdaws and Game Birds in Finland

2018 ◽  
Vol 85 (4) ◽  
Author(s):  
Sara Kovanen ◽  
Mirko Rossi ◽  
Mari Pohja-Mykrä ◽  
Timo Nieminen ◽  
Mirja Raunio-Saarnisto ◽  
...  
Keyword(s):  
Host Specificity ◽  
Campylobacter Jejuni ◽  
Multilocus Sequence Typing ◽  
Wild Birds ◽  
Whole Genome ◽  
Mallard Duck ◽  
Content Type ◽  
Game Birds ◽  
Hygienic Measures ◽  
Sequence Types

ABSTRACTPoultry are considered a major reservoir and source of human campylobacteriosis, but the roles of environmental reservoirs, including wild birds, have not been assessed in depth. In this study, we isolated and characterizedCampylobacter jejunifrom western jackdaws (n= 91, 43%), mallard ducks (n= 82, 76%), and pheasants (n= 9, 9%). Most of the western jackdaw and mallard duckC. jejuniisolates represented multilocus sequence typing (MLST) sequence types (STs) that diverged from those previously isolated from human patients and various animal species, whereas all pheasant isolates represented ST-19, a common ST among human patients and other hosts worldwide. Whole-genome MLST revealed that mallard duck ST-2314 and pheasant ST-19 isolates represented bacterial clones that were genetically highly similar to human isolates detected previously. Further analyses revealed that in addition to a divergent ClonalFrame genealogy, certain genomic characteristics of the western jackdawC. jejuniisolates, e.g., a novelcdtABCgene cluster and the type VI secretion system (T6SS), may affect their host specificity and virulence. Game birds may thus pose a risk for acquiring campylobacteriosis; therefore, hygienic measures during slaughter and meat handling warrant special attention.IMPORTANCEThe roles of environmental reservoirs, including wild birds, in the molecular epidemiology ofCampylobacter jejunihave not been assessed in depth. Our results showed that game birds may pose a risk for acquiring campylobacteriosis, because they hadC. jejunigenomotypes highly similar to human isolates detected previously. Therefore, hygienic measures during slaughter and meat handling warrant special attention. On the contrary, a unique phylogeny was revealed for the western jackdaw isolates, and certain genomic characteristics identified among these isolates are hypothesized to affect their host specificity and virulence. Comparative genomics within sequence types (STs), using whole-genome multilocus sequence typing (wgMLST), and phylogenomics are efficient methods to analyze the genomic relationships ofC. jejuniisolates.

scholarly journals Seasonal Variation in the Haematological Parameters of the Adult Mallard Duck in a Tropical Environment

2020 ◽  
pp. 30-37
Author(s):  
O. S. Olawuwo ◽  
O. I. Azeez ◽  
J. O. Oyewale
Keyword(s):  
Seasonal Variation ◽  
Osmotic Fragility ◽  
Dry Season ◽  
Tropical Environment ◽  
Haematological Parameters ◽  
Mallard Duck ◽  
Corpuscular Haemoglobin ◽  
Erythrocyte Osmotic Fragility ◽  
Mean Corpuscular Haemoglobin ◽  
Erythrocyte Fragility

Duck production is a growing poultry enterprise in Nigeria and they are mostly reared in extensive management system. However, the haematological profiles as influenced by the tropical environment have not been well documented. The objective of the present study was to examine the seasonal variation in the haematological parameters of the adult Mallard duck in the tropical environment of Nigeria; as they effects duck production adversely. The Erythrocyte, leucocyte and platelet counts, as well as the erythrocyte osmotic fragility of the domestic duck of the mallard breed during the wet and dry seasons in the hot humid tropical environment of the Experimental Animal Unit of the Department of Veterinary Physiology, Biochemistry and Pharmacology, University of Ibadan, Ibadan, Nigeria was investigated. The study showed that the values of the packed cell volume (PCV), mean corpuscular haemoglobin (MCH) and platelet were significantly higher in the dry season than in the wet season, but the red blood cell (RBC), haemoglobin (Hb), mean corpuscular volume (MCV), mean corpuscular haemoglobin concentration (MCHC), total and differential leucocyte values were similar in the two seasons. The erythrocyte fragility was also higher in the dry season. In conclusion the higher PCV, MCH and platelet values in the dry season might have resulted from haemoconcentration occasioned by higher evaporative heat loss, which is a common occurrence in the dry season. The higher erythrocyte fragility could have been the result of stress induced by the high ambient temperature during the dry season, or higher metabolic rate associated with lactic acid accumulation, which has been shown to increase erythrocyte osmotic fragility.

Mallard Duck (Anas platyrhynchos)

2010 ◽  
pp. 203-226
Author(s):  
SAM SILVERMAN ◽  
LISA A. TELL ◽  
JODY NUGENT-DEAL ◽  
KRISTINA PALMER-HOLTRY ◽  
KATHY WEST
Keyword(s):  
Anas Platyrhynchos ◽  
Mallard Duck

Isolation of Newcastle disease virus from a wild mallard duck (Anas platyrhynchos)

1979 ◽  
Vol 105 (14) ◽  
pp. 328-329 ◽  
Author(s):  
D. Alexander ◽  
D. Spackman ◽  
W. Allan ◽  
L. Borland
Keyword(s):  
Newcastle Disease Virus ◽  
Disease Virus ◽  
Newcastle Disease ◽  
Anas Platyrhynchos ◽  
Mallard Duck ◽  
Wild Mallard

Isolation of yucaipa-like avian paramyxovirus from a wild mallard duck (Anas platyrhinchos) wintering in Israel

1982 ◽  
Vol 110 (1) ◽  
pp. 15-16 ◽  
Author(s):  
M. Lipkind ◽  
Y. Weisman ◽  
E. Shihmanter ◽  
D. Shoham
Keyword(s):  
Avian Paramyxovirus ◽  
Mallard Duck ◽  
Wild Mallard
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