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. 2019 Jun 18;10:764. doi: 10.3389/fphys.2019.00764

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Copyright © 2019 Brothers, Zhuo, Papah and Abasht.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Comparison of weekly body weight by sex. Day 1 refers to the day of hatch. Male broilers have significantly higher average body weights than females at ages 7, 14, 21, 28, 35, 42, 49, and 56 days (P ≤ 0.0001).