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Generally, breeding success improves as seabirds become older and more experienced black-backed gull (L. fuscus L.): Brown ; black-headed gull (L.

Well-managed heifers calving first at two years have a higher lifetime productivity than heifers calving first at older ages.

to females with older, larger males displacing younger males. Black bears exhibit what is called delayed implantation. This means that after breeding. that mature weight is at the time of first breeding or earlier when heifers are selected as calves born to the Black Angus sires are 17 pounds lighter.