جستجوی مقالات مرتبط با کلیدواژه « bangladesh » 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.

Teknaf Wildlife Sanctuary (TWS), Inani Reserve Forest (IRF) and Chittagong University Campus (CUC) are quite different types of habitat for birds but climatic and weather conditions of these areas are more or less the same because they lie on the same subtropical region. A comparative study on the seasonal occurrence of birds was conducted in TWS, IRF and CUC of Bangladesh from January to December 2015. Data were collected through both strip transect samplings and opportunistic findings. Birds were searched in transects of the existing roads, trails, streams and bridle paths. Twenty-three transects were established to record data: 9 in TWS, 7 in IRF and 7 in CUC.A total of 249 bird species belonging to 50 families were recorded during the study period. TWS was found to be the most diversified area (210 species), followed by IRF (187 species) and CUC (182 species). Among seasons, winter was found to be the most diversified season (240 species) in all areas, followed by summer (176 species), post-monsoon (164 species) and monsoon (138 species). Finally, new information on the seasonal occurrence was recorded for 22 species of non-resident birds in Bangladesh.