数字农科院2.0

Effects Of In Ovo Feeding Of N-Acetyl-L-Glutamate On Early Intestinal Development And Growth Performance In Broiler Chickens

文献类型： 外文期刊

作者： Wang, JG; Lin, J; Wang, J; Wu, SG; Qi, GH; Zhang, HJ; Song, ZG

作者机构：

关键词： N-Acetyl-L-Glutamate; Intestinal Development; Growth Performance; Intestinal Morphology; Nutrient Transporter

期刊名称： POULTRY SCIENCE

ISSN：

年卷期： 2020 年 99 卷 7 期

页码：

收录情况： JCR（2021版）

摘要： The present study determined the effects of in ovo feeding (IOF) of N-acetyl-L-glutamate (NAG) on early intestinal development and growth performance of broilers. A total of 702 fertile broiler eggs were randomly divided into 3 treatments: 1) non-punctured control group, 2) saline-injected control group, and 3) NAG solution-injected group (1.5 mg/egg). At 17.5 D of incubation, 300 mu L of each solution was injected into each egg of injected groups. Results indicated that the hatchability and healthy chicken rate were not affected by NAG injection (P > 0.05). Chicks from NAG solution-injected group had significantly decreased average daily feed intake and feed conversion ratio during 1-14 D than those in the non-punctured control group (P < 0.05). Compared with the non-punctured control group, IOF of NAG significantly increased the density of goblet cells in jejunum at hatch, duodenum at 7 D, and ileum at 14 D; decreased crypt depth in jejunum at hatch; and increased villus height in duodenum and jejunum and villus height:crypt depth ratio in duodenum at 7 D (P < 0.05). The intestinal mRNA expression of Na+-dependent neutral amino acid transporter, peptide transporter, and excitatory amino acid transporter 3 did not differ between groups at 7 or 14 D. However, the mRNA expression level of rBAT in jejunum significantly increased in the NAG solution-injected group than in the non-punctured control group at 7 D (P < 0.05). In conclusion, IOF of NAG (1.5 mg/egg) accelerated the early intestinal development by enhancing intestinal immune and absorption function, thereby positively affecting the feed efficiency for the first 2 wk post-hatch.

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