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Not AvailableIndian farming system basically consists of small and scattered holdings. Inspite of rapid growth of conventional fuel run power units in recent years, the draught animals continue to be the main source of farm power in the whole country leaving aside states of Punjab, Haryana and Western Uttar Pradesh, where tractors are widely used as source of farm power About 60-65% of the total cultivated area is being managed with draught animals as against about 17-19% by tractors. Draught animal popularization is either stagnant or showing marginal increasing trend in Maharashtra and eastern part of the country. It is expected that draught animals would continue to remain as a major source of farm power for at least next 25-30 years For efficient use of available draught power, it was felt necessary to determine the draughtability of different breeds of draught animals, which are used in the different parts of the country The muscle power of animal provides work output when harnesse j. The draught force or tractive effort of animal(s) in sustained basis, endurance, and power output of draught animal is usually determined by its working capacity on sustained basis. It is a function of different muscle, body weight of animal and muscle/bone arrangement of limbs rather than body fat. The muscles, through their contractile units namely Sarcomeres, are the fundamental unit of force production. While, their speed is related to the number of sarcomeres arranged in series and to the sites of attachment of a muscle to a bone. The endurance of muscle is dependent upon the ability of its sarcorneres to obtain and utilize oxygen and nutrients. Draught efficiency is directly related to the animal's work capacity and the transmission efficiency for tractive purposes for the implements to be drawn or operated by them Their working capacity is very much dependent of their anatomical differences due to species besides their physical· condition, breed characters, temperament, age, feeding and care, their training, management and climatic environment The muscles produce lactic acid when animals work. This is reflected by various fatigue parameters. The rest provided to animals diffuses lactic acid and animals get ready to take work again.Not Availabl