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Maximizing reproductive efficiency depends upon whether a heifer attains puberty before the start of the breeding season, conceives early in the breeding season, calves unassisted, raises the calf to the time it is marketed, and the heifer/cow must conceive to calve early during the subsequent...

Lamb, G. C.; Smith, M. F.; Perry, G. A.; Atkins, J. A.; Risley, M. E.; Busch, D. C.; Patterson, D. J.
American Association of Bovine Practitioners, Stillwater, USA
Bovine Practitioner, 2010, 44, 1, pp 18-26