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Anderson RS, Fillmore HL, Wiltbank JN. Improving reproductive efficiency in range cattle: An application of the O'Connor Management System. Theriogenology. 1986;26(2):251-60doi: 10.1016/0093-691x(86)90030-0.
Anderson, R. S., Fillmore, H. L., & Wiltbank, J. N. (1986). Improving reproductive efficiency in range cattle: An application of the O'Connor Management System. Theriogenology, 26(2), 251-60. https://doi.org/10.1016/0093-691x(86)90030-0
Anderson, R S, et al. "Improving reproductive efficiency in range cattle: An application of the O'Connor Management System." Theriogenology vol. 26,2 (1986): 251-60. doi: https://doi.org/10.1016/0093-691x(86)90030-0
Anderson RS, Fillmore HL, Wiltbank JN. Improving reproductive efficiency in range cattle: An application of the O'Connor Management System. Theriogenology. 1986 Aug;26(2):251-60. doi: 10.1016/0093-691x(86)90030-0. PMID: 16726190.
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Theriogenology. 1986 Aug;26(2):251-60. doi: 10.1016/0093-691x(86)90030-0.

Improving reproductive efficiency in range cattle: An application of the O'Connor Management System.

Theriogenology

R S Anderson, H L Fillmore, J N Wiltbank

Affiliations

  1. Animal Science Department Brigham Young University Provo, Utah 84602 USA.

PMID: 16726190 DOI: 10.1016/0093-691x(86)90030-0

Abstract

One group of 125 Hereford cows from a range herd served as a control, while five management techniques were utilized to determine if reproductive performance could be maximized in another similar group from the same ranch. These five techniques were 60-d calving season, cows in moderate body condition at calving time, calf removal for 48 h at the start of breeding season, cows gaining weight near breeding time, and cows bred by bulls predicted to have high fertility (O'Connor Management System). Under the O'Connor Management System, 6% more cows became pregnant, 14% more weaned calves and calves were born 24 d earlier in the calving season. Consequently, calves weighed 14 kg more at weaning and net profit was increased approximately $39 per cow for cows in the O'Connor system.

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