The dynamic requirements of tryptophan in the broilers at different growing stages under low-protein diets.

Yuying Zhang, Suxin Shi, Gaoxiang Yuan, Xiaoyi Li, Zhouyang Gao, Yongfei Hu, Yuming Guo, Dan Liu

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Article in Poultry science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

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8 authors.

Yuying ZhangState Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.

Suxin ShiState Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.

Gaoxiang YuanState Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.

Xiaoyi LiState Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.

Zhouyang GaoState Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.

Yongfei HuState Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.

Yuming GuoState Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.

Dan LiuState Key Laboratory of Animal Nutrition and Feeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China. Electronic address: liud@cau.edu.cn.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The experiment was conducted to clarify the dynamic requirement of tryptophan (Trp) in broilers under low-protein diets and construct a prediction model based on the Trp requirement. A total of 1080 male and 1080 female Arbor Acres broilers at 0 d old were randomly assigned to 6 treatments and allotted to 3 stages: 0 to 14 d starter, 15 to 28 d grower, and 29 to 42 d finisher. The birds in the control group (group NC) were fed with conventional protein diets with nutrient levels formulated to breeder recommendations. The experimental groups (groups Ⅰ to Ⅴ) were fed low-protein diets with different Trp levels which were 80% (group Ⅰ), 90% (group Ⅱ), 100% (group Ⅲ), 110% (group Ⅳ) and 120% (group Ⅴ) of NC group, respectively. The results showed that the optimal response dose of Dig.Trp/Dig.Lys was 0.172 to 0.175 for female broilers, 0.163 to 0.170 for male broilers in starter stage; 0.167 to 0.175 for female broilers, 0.168 to 0.176 for male broilers in grower stage; 0.175 to 0.177 for female broilers in finisher stage. The dynamic model of Dig.Trp/Dig.Lys daily requirement on average metabolic BW and ADG was y = 0.835 × BW

Indexed as

ChickensDietary ProteinsDiet, Protein-RestrictedNutritional RequirementsTryptophanAnimal FeedAnimal Nutritional Physiological PhenomenaAnimalsDietDietary SupplementsDose-Response Relationship, DrugFemaleMaleRandom AllocationDietary ProteinsTryptophanBroilerImmune functionRequirementTryptophan

Identifiers

PMID41903460

DOI10.1016/j.psj.2026.106755

PMCPMC13054028

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