author(s)
Deshvena SS, Solanki SN and Waghmare AA

abstract
The bullock energy can be used in the rotary mode set up for post-harvest operations like Grain cleaning and Grading, chaff cutting, daal mill operations, flour milling and other stationery operations. The proposed research work presents the performance evaluation of the grain cleaner cum grader unit. The draft requirement varied from 480.2 N in the beginning to 421.4 N at the end. The mean draft was 434.43N which was 5.03 per cent of the bodyweight of the bullocks. The respiration rate, pulse rate as usual increased with duration. The mean respiration rate, pulse rate of B1 and B2 was observed as 24 and 25.75bpm, 56.75 and 55.25bpm respectively. The mean rpm of the Grain cleaner cum grader shaft was observed to be 320. The output of the machine gradually decreased with duration may be due to decrease in the speed of shaft of the Grain cleaner cum grader. The mean output was found to be 683.3kg/h were as the output of Grain cleaner cum grader operated with an electric motor was 760 kg/h. The mean power output from the bullock was found to be 0.538 kW. This indicated that the bullock could easily do the cleaning operation and their utilization could be enhanced. The lower value of working efficiency may be attributed due to obstruction in the in the reciprocating motion of graders sieves of Grain cleaner cum grader by the non-uniform speed of bullocks during working of the grain cleaner cum grader .The operation of Grain cleaner cum grader was found to be feasible considering the draftability of Red Kandhari bullocks and their output capacity.