Optimizing low crude protein diet: Evaluating Glycine as a conditionally essential Amino Acid

文献类型： 外文期刊

第一作者： Iqbal, Waqar

作者： Iqbal, Waqar;Ayalew, Habtamu;Li, Siman;Xu, Changchun;Zhang, Haijun;Ayalew, Habtamu;Wang, Xiaocui;Yaqoob, Muhammad Umar;Ali, Awais

作者机构：

关键词： Low protein die; Glycine; Production performance; Egg quality; Laying hens

期刊名称：POULTRY SCIENCE （ 影响因子：4.2； 五年影响因子：4.5 ）

ISSN： 0032-5791

年卷期： 2025 年 104 卷 7 期

页码：

收录情况： SCI

摘要： Global interest has emerged in implementing low crude protein (LCP) diets for poultry. The necessity of their development stems from low-cost formulation, maintaining egg quality, and environmental impacts, including health and welfare concerns for current egg production in the world. Researchers have conducted several studies to provide biochemical insights into the effect of LCP on laying hen diets, but practical limitations of LCP diets still exist. Supplementing laying hen feed with crystalline essential amino acids (AAs) like methionine, lysine, and threonine is standard industry practice. It has enabled a reduction of dietary crude protein (CP) to the standard level. However, research considering nonessential AAs like glycine (Gly) in LCP diets is still limited. Therefore, this review aims to enhance the understanding of LCP diets for laying hens, focusing on Gly. However, dietary Gly equivalents (Glyequi) for Gly represented the first-limiting nonessential amino acid in poultry diets. Targeted adjustment of essential AAs and Glyequi can considerably decrease CP in poultry diets. Gly is generally considered a nonessential AA in standard CP poultry diets. However, it becomes conditionally essential AA under dietary LCP situations. The variable requirement for dietary Glyequi suggested that its static recommendation in poultry diets provides high safety margins of Gly in the LCP of laying hen diets. These variable recommendations for dietary Glyequi in LCP diets would help optimize egg production and albumin quality and reduce nitrogen (N) emissions in poultry farms. The current review suggests that Gly could be a conditionally essential AA for laying hens fed with LCP diets.

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