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Estimation of L-threonine requirements for Longyan laying ducks

  • Fouad, A.M. ;
  • Zhang, H.X. ;
  • Chen, W. ;
  • Xia, W.G. ;
  • Ruan, D. ;
  • Wang, S. ;
  • Zheng, C.T.
  • Received : 2016.03.22
  • Accepted : 2016.06.01
  • Published : 2017.02.01

Abstract

Objective: A study was conducted to test six threonine (Thr) levels (0.39%, 0.44%, 0.49%, 0.54%, 0.59%, and 0.64%) to estimate the optimal dietary Thr requirements for Longyan laying ducks from 17 to 45 wk of age. Methods: Nine hundred Longyan ducks aged 17 wk were assigned randomly to the six dietary treatments, where each treatment comprised six replicate pens with 25 ducks per pen. Results: Increasing the Thr level enhanced egg production, egg weight, egg mass, and the feed conversion ratio (FCR) (linearly or quadratically; p<0.05). The Haugh unit score, yolk color, albumen height, and the weight, percentage, thickness, and breaking strength of the eggshell did not response to increases in the Thr levels, but the albumen weight and its proportion increased significantly (p<0.05), whereas the yolk weight and its proportion decreased significantly as the Thr levels increased. Conclusion: According to a regression model, the optimal Thr requirement for egg production, egg mass, and FCR in Longyan ducks is 0.57%, while 0.58% is the optimal level for egg weight from 17 to 45 wk of age.

Keywords

Laying Duck;Requirement;Threonine

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Cited by

  1. Effects of dietary lysine supplementation on performance, egg quality, and development of reproductive system in egg-laying ducks pp.0974-1844, 2017, https://doi.org/10.1080/09712119.2017.1308868

Acknowledgement

Supported by : Guangdong Provincial Key Laboratory of Animal Breeding and Nutrition