The study was conducted to investigate the haematological and biochemical parameters of four indigenous duck breeds in northern Vietnam. A total of 115 blood samples of Co, Pat Lai, Na Tau, and Troi ducks were collected from Ha Noi, Lang Son, Dien Bien, and Bac Ninh provinces, respectively, for the analyses of haematological parameters (red blood cells, white blood cells, and their indices) and biochemical parameters (total protein, albumin, and globulin). Most of the haematological parameters and all of the biochemical parameters were significantly different among the breeds (P <0.05). Particularly, red blood cells, hematocrit percentage, lymphocytes, and basophils in Co; mean corpuscular volume and mean corpuscular hemoglobin in Pat Lai; white blood cells in Pat Lai and Troi; and neutrophils in Na Tau and Troi ducks were found to be higher (P <0.05). Total protein and albumin were greater in the Co and Pat Lai breeds while globulin was observed to be lower in the Na Tau ducks (P <0.05). Significant effects of sex (P <0.05) were observed in most of the haematological and biochemical parameters except mean corpuscular volume, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration, and neutrophils. Interactions between breed and sex were observed for most of the haematological and biochemical parameters except red blood cells, white blood cells, lymphocytes, and eosinophil (P <0.05).
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