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Articles by A. Nahar
Total Records ( 2 ) for A. Nahar
  A. Hoque , A. Nahar , M.A. Razvy , M.K. Biswas and A.H. Kabir
  Three varieties of water chestnut (Trapa quadrispinosa, T. bispinosa and T. acornis) collected from Rajshahi, Naogaon, Natore have been used in this study. Embryonal explants were found to be best for callus induction on the medium containing half strength MS salts in combination of 2.5 mg L-1 2,4-D and 1 mg L-1 BA in all three varieties. For survival of explant 0.1% HgCl2 having 7 minutes of treatment period was found to be best. Addition of CH (2.0 mg L-1) and PG (2.0 mg L-1) proved to be effective to overcome the phenolic oxidant during callus induction. Callus derived plantlet formation was being a difficult task in water chestnut. Liquid half strength MS medium supplemented with 1.1 mg L-1 BA and 0.5 mg L-1 NAA has been proved to be best for shoot proliferation in all the varieties. Moreover, addition of 0.5 mg L-1 GA3 with aforesaid combination highly stimulated the axillary shoot elongation of Trapa sp. Rooting of produced shoot showed highest percentage in a liquid half strength MS medium containing 1.1 mg L-1 IBA. This in vitro plantlet were then transferred and acclimatized in plastic pots under favorable humidity and temperature. After 4 weeks of acclimatization callus derived plantlets were established successfully in a water chestnut field. It was found that all the plantlets were disease free and the survival rate was almost 95%.
  A. Nahar , M. Al-Amin , A. Wadud , M.M. Monir and M.A.S. Khan
  This study was undertaken with a view to determining the effect of partial green grass over dry feeding on the productive performance of early lactating crossbred cows. With that understanding, fifteen early lactating crossbred cows having nearly similar body weight, body condition score, milk yield and stage of lactation were selected and divided into three groups composed of five in each group (A, B and C group). Cows of A group received 2 kg concentrates without green grass daily. Group B and C received daily 1.85 kg conc. + 3 kg green grass and 1.75 kg conc. + 6 kg green grass respectively along with ad libitum straw for each cow of all groups. Daily feed intake were recorded. Live weight changes of cows were measured fortnightly and condition scores were measured before starting and at the end of the experiment. Milk composition (fat, SNF, protein and ash) as percentage were determined monthly. The average daily DM intake were 7.07±0.12, 7.16±0.03 and 7.78±0.04 kg for A, B and C group, respectively. This study showed that the DM intake, live weight gain, body condition score, milk yield and milk composition in respect of fat, SNF and protein were significantly (p<0.01 and p<0.05) higher in C group followed by B group and lowest values obtained in A group. Considering the present research, it would be fair to conclude that the partial green grass over dry feeding showed the positive effect on the productive performance of early lactating crossbred cows.
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