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The combination of physiological events which take place starting with estrus (heat) and ending with the next heat is termed estrous cycle. The estrous cycle of cow range from 19 to 21 days. The whole estrous cycle may be divided into 4 phases viz., estrus, metestrus, diestrus and proestrus.
Match List I with List II
Match the weed in List I with their bio-control agent in List II