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Roberts AJ, Ketchum JN, Funston RN. Developmental and reproductive characteristics of beef heifers classified by number of estrous cycles experienced by start of first breeding. Transl Anim Sci. 2018;3(1):541-548doi: 10.1093/tas/txy118.
Roberts, A. J., Ketchum, J. N., & Funston, R. N. (2019). Developmental and reproductive characteristics of beef heifers classified by number of estrous cycles experienced by start of first breeding. Translational animal science, 3(1), 541-548. https://doi.org/10.1093/tas/txy118
Roberts, Andrew J, et al. "Developmental and reproductive characteristics of beef heifers classified by number of estrous cycles experienced by start of first breeding." Translational animal science vol. 3,1 (2019): 541-548. doi: https://doi.org/10.1093/tas/txy118
Roberts AJ, Ketchum JN, Funston RN. Developmental and reproductive characteristics of beef heifers classified by number of estrous cycles experienced by start of first breeding. Transl Anim Sci. 2018 Nov 23;3(1):541-548. doi: 10.1093/tas/txy118. eCollection 2019 Jan. PMID: 32704825; PMCID: PMC7200409.
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Transl Anim Sci. 2018 Nov 23;3(1):541-548. doi: 10.1093/tas/txy118. eCollection 2019 Jan.

Developmental and reproductive characteristics of beef heifers classified by number of estrous cycles experienced by start of first breeding.

Translational animal science

Andrew J Roberts, Jaclyn N Ketchum, Richard N Funston

Affiliations

  1. USDA-ARS, Fort Keogh Livestock and Range Research Laboratory, Miles City, MT.
  2. University of Nebraska West Central Research and Extension Center, North Platte, NE.

PMID: 32704825 PMCID: PMC7200409 DOI: 10.1093/tas/txy118

Abstract

A retrospective analysis was conducted to evaluate the effect of number of estrous cycles exhibited before breeding on growth and reproductive performance of replacement beef heifers fed ad-libitum or restricted by 20% less than ad-libitum during postweaning development over a 9-yr period. Progesterone concentration in blood samples collected at 9- to 11-d intervals were used to assign heifers into groups by number of estrous cycles exhibited before the start of breeding: 0 (nonpubertal;

Published by Oxford University Press on behalf of the American Society of Animal Science 2018.

Keywords: beef heifers; heifer development; puberty; reproduction

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