جستجوی مقالات مرتبط با کلیدواژه « duck » در نشریات گروه « علوم دام »

Duck is an important genetic resource primarily used for egg and meat in Bangladesh. This study evaluated the growth performance and egg production potentials of Pekin (P) × Nageswari (N) crossbred ducks compared to its parental Pekin and Nageswari breeds. The growth performance data of 440 P×N crossbreds were collected from three generations (F1, F2, and F3), while the first two generations' data on productive and reproductive traits were considered. Besides, performances of parental Pekin and Nageswari ducks (100 from each breed) were included in the evaluation process. The growth performance significantly differed among the Pekin, Nageswari and P×N crossbreds from day old to the 12th week of age (P < 0.001). The average live weight of the Nageswari duck was 1367 ± 17.38 g at the 12th week of age and was 1703.02 ± 19.76, 1910.46 ± 18.81 and 1826.49 ± 20.63 g, respectively, in F1, F2 and F3 crossbreds that close to the parental Pekin duck (1908.26 ± 34.18 g). Growth performance was superior in all three crossbred generations up to the 12th week of age except day old. The positive heterosis varied from 3.86 to 15.64% at marketing age (12th week). The P×N crossbreds attained sexual maturity two weeks earlier than the Pekin duck. The hen day egg production (HDEP%) was significant (P < 0.01) among the genotypes up to the 40th week of age except the 28th week. The total number of eggs up to 280 days in Pekin, Nageswari and two P×N crossbred F1 and F2 generations were 90.54, 92.32, 86.61 and 94.08, respectively. The egg weight of parental pure breeds and P×N crossbreds differed significantly (P < 0.05) during the investigated periods from the 24th to the 40th week of age. This result reflects the significance of non-additive genetic effects on growth traits. In conclusion, the genetic evaluation involving three generations of data essentially helps to establish the performances of the developed P×N crossbred duck.

Antibiotic resistance is a growing concern all over the world. The current study sought to identify antimicrobial resistance (AMR) patterns and antibiotic-resistant genes in Escherichia coli (E. coli) isolated from seemingly healthy ducks and neighboring tap water sources at three separate live bird markets (LBMs) in Chattogram, Bangladesh. A total of ninety cloacal swab samples of Khaki Campbell ducks and fifteen water samples from nearby tap water sources were collected from three LBMs. Several cultural and molecular tests were conducted to determine  E. coli contamination. The disk diffusion technique was used to evaluate the antibiotic sensitivity of E. coli isolates to 12 different antibiotics. For each isolate, a Multiple Antibiotic Resistance (MAR) index was calculated. The resistance genes were detected using a polymerase chain reaction (PCR) assay. The overall prevalence of E. coli in feces and tap water samples was 64.4% (58/90, 95% CI 54.1-73.6) and 100% (15/15, 95% CI 76.1-100), respectively. Both fecal and water isolates showed 100% resistance to ampicillin, tetracycline, and nalidixic acid. Resistance to other antibiotics was also found to be high. Multidrug- resistance (MDR) was unveiled in all fecal (58/58) and water (15/15) isolates. MAR index ranged from 0.33 to 0.67 in all recovered isolates. Both fecal and water E. coli isolates harbored blaTEM, tetA, sul1, and sul2 genes. The resistance genes in MDR E. coli in live bird markets might transmit from ducks to humans and they, therefore local authorities should consider this issue a major public health risk.