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Generally,the heartbeat rate of any mammal is calculated as below heartbeat rate(pm) = 241/fourth root of mammal in Kg The weight of rat varies from 450 gm to 650 gm(male weigh more than female). when we calculate with maximum weight of 650 gm ,the heartbeat comes around 272/min and as weight decreases ,the heartbeat rate increases.

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17y ago

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