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Fouad AM, Zhang HX, Chen W, et al. Estimation of L-threonine requirements for Longyan laying ducks. Asian-Australas J Anim Sci. 2016;30(2):206-210doi: 10.5713/ajas.16.0235.
Fouad, A. M., Zhang, H. X., Chen, W., Xia, W. G., Ruan, D., Wang, S., & Zheng, C. T. (2017). Estimation of L-threonine requirements for Longyan laying ducks. Asian-Australasian journal of animal sciences, 30(2), 206-210. https://doi.org/10.5713/ajas.16.0235
Fouad, A M, et al. "Estimation of L-threonine requirements for Longyan laying ducks." Asian-Australasian journal of animal sciences vol. 30,2 (2017): 206-210. doi: https://doi.org/10.5713/ajas.16.0235
Fouad AM, Zhang HX, Chen W, Xia WG, Ruan D, Wang S, Zheng CT. Estimation of L-threonine requirements for Longyan laying ducks. Asian-Australas J Anim Sci. 2017 Feb;30(2):206-210. doi: 10.5713/ajas.16.0235. Epub 2016 Jun 09. PMID: 27282968; PMCID: PMC5205608.
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Asian-Australas J Anim Sci. 2017 Feb;30(2):206-210. doi: 10.5713/ajas.16.0235. Epub 2016 Jun 09.

Estimation of L-threonine requirements for Longyan laying ducks.

Asian-Australasian journal of animal sciences

A M Fouad, H X Zhang, W Chen, W G Xia, D Ruan, S Wang, C T Zheng

Affiliations

  1. Institute of Animal Science, Guangdong Academy of Agricultural Science, Key Laboratory of Animal Nutrition and Feed Science (South China) of Ministry of Agriculture, State Key Laboratory of Livestock and Poultry Breeding, Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, China.
  2. Department of Animal Production, Faculty of Agriculture, Cairo University, Giza 12613, Egypt.

PMID: 27282968 PMCID: PMC5205608 DOI: 10.5713/ajas.16.0235

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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