The aim of the study was to estimate the prevalence of subclinical mastitis (SCM) in lactating cows of Mymensingh and Lakshmipur sadar upazilas and to evaluate the efficacy of intramammary infusion in subclinical mastitis affected cows. A cross-sectional study was carried out on 78 smallholder dairy farms using a pretested questionnaire to collect data from June 2011 to May 2012. Milk samples from 139 lactating cows were screened for SCM by California Mastitis Test. A total of 72 cows was found positive for SCM and treated with the Neomastipra-JR5 ® intramammary infusion tube (Hipra, Spain). The overall prevalence of subclinical mastitis in lactating cows was 51.8%, of which 51.4% at Mymensingh sadar and 52.2% at Lakshmipur sadar upazilas. The prevalence of subclinical mastitis was significantly increased with age and parity of cows. In left hind quarter, the prevalence of subclinical mastitis was significantly higher (33.1%) than those of other quarters. The efficacy of intramammary infusion with Neomastipra-JR5 ® in lactating cows was 66.7%.

Anther of five varieties of Brassica species, namely BARI Shariaha-7, Tori-7, Agrani, Daulat and Safal were cultured in vitro to observe their regeneration potentiality. Different concentrations and combinations of growth regulators were supplemented in MS medium. The range of callus induction was 12.50-87.50 %. Maximum callus induction (75.00%) was observed on MS +4 mg/L 2, 4-D + 1.0 mg/L BAP. Among the genotypes, BARI Sharisha-7 showed the highest percentage of callus induction (60.42%). Among the treatments, highest percentage of shoot regeneration (75.00%) was observed on MS + 4 mg/L BAP + 1.0 mg/L NAA. BARI Sharisha-7 also showed the highest rate of plant regeneration (66.67%). Root induction was highest (75%) on half strength MS medium supplemented with 1.0 mg/L IBA and 0.5 mg/L NAA. The plantlets with sufficient roots thus obtained were transferred successfully to plastic pots and subsequently to the field. BARI Sharisha-7 and Tori-7 survived easily in the pots as well as in the field but Safal was very poor in survivability both in the pots and in the field. Key Words: Brassica; haploid; anther culture; in vitro regeneration.DOI: 10.3329/bjar.v34i4.5844Bangladesh J. Agril. Res. 34(4) : 693-703, December 2009

The experiment was conducted to investigate the present status and potentialities of organic goat production in Mymensingh district of Bangladesh through field survey. The data were collected through an interview schedule personally from 45 respondents in 3 villages of Bhaluka upazila who were involved in goat production. Parameters studied were check list for organic goat production likes origin, feeds and fodder, breeding, health care, living conditions and record keeping of livestock and factors related to organic goat production. In this study, about 100% goats were indigenous in origin. Among the farmers, 96% farmers used roadside grass and tree leaves whereas, only 4% farmers used cultivated fodder which was cultivated in their own land. 85% farmers used mixed feed which prepared by themselves. However, only 11% farmers used vitamin mineral supplementation.100% farmers used natural breeding method for goat breeding. About 91, 80 and 100% farmers practiced vaccination, deworming and castration method, respectively. About 84% farmers did not use hormone, antibiotic and growth promoter and 67% farmers removed sick or injured animals from healthy stock. About 100% farmers allowed access to outdoor and fallow land throughout the year. Only 31% farmers reared male and female goat separately and 60% farmers kept livestock record. In Bangladesh goat are reared in the conventional method where different inorganic substances are used by the farmers There are great potentialities for organic goat production in Bangladesh both for satisfying animal protein requirements and production of quality goat meat. For this, it is a prime importance to find out the present status and explore the potentialities of organic goat production in Bangladesh. Bang. J. Anim. Sci. 2018. 47 (1): 13-20

A Petridish and hydroponic culture experiments were conducted at Crop Physiology Laboratory, Department of Crop Botany and Agriculture Chemistry Laboratory, Bangladesh Agricultural University, Mymensingh during the period from August to October 2011 to investigate the effect of aluminium on morphological characters and growth of wheat seedlings. The experiment comprised of two levels of aluminium concentrations viz., 0 μM (control) and 100 μM and five varieties viz; Kanchan, Shatabdi, Sourav, Bijoy (BARI-23) and Sufi (BARI-22). The experiment was laid out in two factors completely randomized design with three replications. Applications of 100 μM aluminium had a profound influence on hypocotyls and epicotyls length, germination percentages, and rootshoot length, fresh and dry mass production in wheat. Results indicated that germination percentage, hypocotyls and epicotyls length, root and shoot length, leaf length, leaf sheath length, plant height, fresh and dry mass plant were greater in control than aluminium stress conditions. It revealed that wheat seedlings are susceptible to aluminium stress. However, among the varieties, the reduction of dry mass under aluminium stress was minimum in Shatabdi followed by Kanchan showed that Shatabdi was more tolerant to aluminium stress than the other varieties namely Sourav, Bijoy (BARI-23) and Sufi (BARI-22). Sufi and Sourav were more susceptible to aluminium stress. SAARC J. Agri., 17(1): 65-76 (2019)

ABSTRACT. Performance of three generation (G 0

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An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from December 2017 through May 2018 to evaluate the effect of weed management practices on the performance of boro rice cultivars. The experiment consisted of three boro rice cultivars viz., BRRI dhan28, BRRI dhan29 and BRRI dhan74 along with six different weed management practices such as no weeding, application of preemergence herbicide Superhit, application of early post-emergence herbicide Changer, application of pre-emergence herbicide Superhit followed by one hand weeding at 40 DAT (days after transplanting), application of early postemergence herbicide Changer followed by one hand weeding at 40 DAT, and two hand weedings at 20 and 40 DATs. Cultivars had no significant effect on weed density at 20 and 40 DATs but showed significant effect at 60 DAT and weed dry weight was not significantly affected by cultivars at different DATs.Weeding regime had significant effect on weed density and dry weight at different DATs. The highest weed dry weight was observed in no weeding treatment and the lowest one was recorded in application of early postemergence herbicide followed by one hand weeding at 40 DAT. BRRI dhan29 with no weeding treatment produced the highest weed dry weight and BRRI dhan28 with application of early post-emergence herbicide followed by one hand weeding produced the lowest weed dry weight at different DATs. BRRI dhan74 produced the highest grain and straw yields among the studied cultivars. The highest grain yield was obtained from application of pre-emergence herbicide Superhit (Pretilachlor) followed by one hand weeding at 40 DAT due to the highest number of effective tillers hill -1 and highest number of grains panicle -1 in this treatment. Rice cultivar BRRI dhan29 with application of preemergence herbicide followed by one hand weeding at 40 DAT produced the highest grain yield and the lowest one was resulted from BRRI dhan29 in combination with no weeding treatment. From the economic analysis it is observed that cultivar BRRI dhan29 with application of pre-emergence herbicide followed by one hand weeding at 40 DAT maximized the BCR. So, for controlling weeds in effective manner and in order to get the highest grain yield and the highest economic return in boro rice, BRRI dhan29 with application of pre-emergence herbicide followed by one hand weeding at 40 DAT might be recommended.

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