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Threonine Requirements in Dietary Low Crude Protein for Laying Hens under High-Temperature Environmental Climate

文献类型： 外文期刊

作者： Azzam, Mahmoud Mostafa 1 ; Alhotan, Rashed 1 ; Al-Abdullatif, Abdulaziz 1 ; Al-Mufarrej, Saud 1 ; Mabkhot, Moham 1 ;

作者机构： 1.King Saud Univ, Coll Food & Agr Sci, Anim Prod Dept, Riyadh 11451, Saudi Arabia

2.Guangdong Acad Agr Sci, Inst Anim Sci,State Key Lab Livestock & Poultry B, Guangdong Key Lab Anim Breeding & Nutr,Minist Agr, Guangdong Publ Lab Anim Breeding & Nutr,Key Lab A, Guangzhou 510640, Guangdong, Peoples R China

3.Mansoura Univ, Fac Agr, Poultry Prod Dept, Mansoura 35516, Egypt

关键词： cholesterol; CuZn-SOD; HMG-CoA; HSP70; laying hens; L-Thr

期刊名称：ANIMALS （ 影响因子：2.752； 五年影响因子：2.942 ）

ISSN： 2076-2615

年卷期： 2019 年 9 卷 9 期

页码：

收录情况： SCI

摘要： Simple Summary The threonine (Thr) requirement of laying hens in a high-temperature climate is scarcely referred in the review of literature. Therefore, our aim was to estimate the dietary Thr requirement in low CP diets in a high-temperature environmental climate. Based on our findings, the optimal dietary Thr requirements to optimize egg production, serum uric acid, and serum CuZn-SOD were 0.58%, 0.59%, and 0.56%, respectively, by regression analysis. Lohmann Brown hens (n = 420), at 28 weeks of age, were divided into five dietary treatments, and each treatment included six replicates of 14 laying hens. Dietary crude protein (14%) was presented as the control diet. Dietary L-Thr was added to the control diet for 12 weeks. Dietary Thr levels are 0.43%, 0.49%, 0.57%, 0.66%, and 0.74%, based on digestible base. From 28 to 40 weeks, hen-day egg production presented a quadratic trend to supplementing dietary Thr (R-2 = 0.96, p = 0.02), and reached a maximum level at 0.58%. Serum uric acid demonstrated a quadratic trend (R-2 = 0.62, p = 0.02) at 0.59%. Both serum total cholesterol and 3-hydroxy-3-methylglutaryl (HMG-CoA) reductase showed lower levels (p < 0.05) at 0.66% Thr. Serum CuZn-SOD elevated (p < 0.05) at 0.49%, 0.57%, and 0.66% Thr, as compared to the control group, and showed a quadratic trend (R-2 = 0.87, p = 0.003) at 0.56%. Supplemental L-Thr decreased (p < 0.05) the expression of ileal HSP70 at 0.66% Thr. In summary, the optimal dietary Thr requirements to optimize egg production, serum uric acid, and serum CuZn-SOD were 0.58%, 0.59%, and 0.56%, respectively, by regression analysis.

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