Tình hình nhiễm virus gây bệnh Marek trên gà thả vườn ở thành phố Cần Thơ
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Abstract
An investigation was conducted to access the prevalence of Marek’s disease virus (MDV) in backyard chicken flocks in Can Tho city. A total of 353 feather follicle samples were collected from 50 unvaccinated chicken flocks for Marek’s disease in Phong Dien, Co Do, Thoi Lai and Vinh Thanh districts. The confirmation of MDV infection was conducted by polymerase chain reaction to detect in specific Meq gene of the MDV serotype 1. The results showed that 26 out of 353 samples were positive for MDV accounting 7.37%. The prevalence of MDV in chickens in Phong Dien district was highest with 16.07%, followed by Co Do (8.60%), Thoi Lai (5.43%), and Vinh Thanh (3.57%) districts, and the different prevalence of MDV in chickens among Phong Dien, Thoi Lai and Vinh Thanh districts was significant (P<0,05). Prevalence of MDV in noi breed (11.58%) was higher than that in cross-breed (6.17%). There were no statistically significant differences in the prevalence of MDV by chicken age. The results illustrated that MDV presented in chickens in all the survey districts.
Tóm tắt
Khảo sát tỷ lệ nhiễm virus gây bệnh Marek (MDV) trên các đàn gà thả vườn đã được thực hiện ở thành phố Cần Thơ. Tổng số 353 mẫu nang lông được thu thập từ 50 đàn gà chưa tiêm vaccine phòng bệnh Marek ở các huyện Phong Điền, Cờ Đỏ, Thới Lai và Vĩnh Thạnh. Việc xác định gà nhiễm MDV được thực hiện bằng kỹ thuât PCR để phát hiện gen Meq đặc hiệu của MDV serotype 1. Kết quả nghiên cứu cho thấy có 26/353 mẫu nhiễm MDV chiếm 7,37%. Tỷ lệ nhiễm MDV trên gà ở huyện Phong Điền là cao nhất với 16,07%, kế đến là ở các huyện Cờ Đỏ (8,60%), Thới Lai (5,43%) và Vĩnh Thạnh (3,57%); có sự khác biệt có ý nghĩa về tỷ lệ nhiễm MDV trên gà giữa các huyện Phong Điền, Thới Lai và Vĩnh Thạnh (P<0,05). Tỷ lệ nhiễm MDV trên giống gà nòi (11,58%) cao hơn gà lai (6,17%). Tỷ lệ nhiễm MDV trên gà giữa các độ tuổi khác biệt không có ý nghĩa thống kê. Kết quả nghiên cứu chứng minh có sự hiện diện của MDV trên gà ở các huyện khảo sát.
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