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The larger and stronger the antlers, the more successful in mating the male deer would be, and the more offspring he would have  offspring which could inherit parental genes for large antlers. Source: 1  Gould, S.J. 1977. 2  The misnamed, mistreated, and misunderstood Irish elk.
The male deer (also known as a buck) usually weighs from 130 to 300 pounds (60 to 130 kg) but, in rare cases, bucks in excess of 375 pounds (159 kg) have been recorded. In 1926, Carl J. Lenander, Jr. took a Whitetailed buck near Tofte, MN that was estimated at 511 pounds live weight.