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Background: Proportion of roughage and concentrate supply to dairy animal is a major challenge in commercial dairying of Bangladesh that directly correlated with quality and quantity of milk. Several studies revealed that, level of milk urea nitrogen (MUN) is an indication of proper feed supply of the animals. Therefore, the study was the attempt to find, the relationship between the level of MUN with metabolic energy (ME) and crude protein (CP) by supplied ratio of roughage, concentrate and effect of altered level MUN with milk quality and quantity in commercial dairy farms of Chittagong, Bangladesh. Methods: For the study, feed and milk samples were taken from randomly selected three different farm categories for the period of July 2014 to June 2015 monthly. The herd average milk production was taken from the recorded data. The feed and milk composition were analyzed in the dairy lab of Chittagong Veterinary and Animal Sciences University (CVASU). MUN was determined by spectrophotometric method in the Poultry Research and Tanning Laboratory (PRTC) of CVASU, Chittagong, Bangladesh. Observed data was analyzed by using Pearson's correlation methods to find out the correlation among MUN level, supplied source of ME and CP and milk production and composition. Result: The results suggested that there was significant level difference of MUN (P<0.05) irrespective of seasons and farm categories with the sources of ME and CP of supplied feed. Milk yield relate significantly (P<0.05) with MUN level when there was lowest supply of roughage and maximum M.E comes from concentrate feed irrespective of farm categories. So, determination of MUN level will be helpful to commercial dairy farmers when the issues related to milk quality and quantity. [ABSTRACT FROM AUTHOR]

Background: There are no in-depth research on commercial dairying management and performance of dairy cows under commercial dairying in Chittagong, Bangladesh. The good farming practice and cow's productivity leads the farm profitability. This study may assist to overcome the problems related to the profitability of dairy farms. Methods: The study was conducted in 28 commercial dairy farms based on two types of data. Primary data: generated from stock inventory and farm management information using a pretested survey questionnaire and analyzed data of average production performance and quality of milk traits indifferent crosses collected directly four times season wise (summer, monsoon and winter) from each selected farms of Chittagong, Bangladesh from 2014 to 2015. Result: Overall management system of irrespective categories of farms was in moderate condition with some exception. Highest number of milking animal was 50% HF x 50% L cross under all farm categories. Crosses of 75% HF x 25% L were highest in number under farm category A and lowest C. In terms of milk quality and quantity, farms with higher number of animals were in better condition. Daily average milk yield was significantly higher in monsoon followed by summer and winter. Therefore, this current study would be helpful for the dairy farmers to find out an expected solution to overcome the problems in this sector. [ABSTRACT FROM AUTHOR]