- \n
- Increased average daily gain (ADG) and feed intake<\/li>\n
- Reduced feed conversion ratio (FCR)<\/li>\n<\/ul>\n
It also alleviated intestinal damage and normalized the expression of genes related to immune regulation and gut barrier integrity, including IL-10, IL-22, occludin, and ZO-1. Additionally, increased serotonin levels and upregulation of genes such as TPH1, IDO2, AhR, and CYP1A1 were observed.<\/p>\n
![\"\"](\"https:\/\/www.poultryindonesia.com\/wp-content\/uploads\/2026\/04\/Adv_-CJ-BIO-APRIL26-tabel-1.jpg\")
Overall, these findings indicate that 0.1% dietary tryptophan can enhance immune response, reduce intestinal damage, and improve growth performance in infected broilers.<\/p>\nSimilar benefits have been observed in piglets challenged with lipopolysaccharide (LPS). Liu et al. (2022) reported that higher dietary tryptophan improved gut microbiota composition by increasing beneficial bacteria and reducing harmful microbes.<\/p>\n
More broadly, tryptophan contributes to gut health through:<\/p>\n
- \n
- Modulation of gut microbiota<\/li>\n
- Increased production of short-chain fatty acids (SCFAs)<\/li>\n
- Reduced inflammation<\/li>\n
- Strengthened intestinal barrier function<\/li>\n<\/ul>\n
![\"\"](\"https:\/\/www.poultryindonesia.com\/wp-content\/uploads\/2026\/04\/Adv_-CJ-BIO-APRIL26-2.jpg\")
<\/p>\n
\nTryptophan Improves Microbiota Balance Under Transport Stress<\/h3>\n
Livestock are frequently exposed to stressors such as handling, environmental changes, and transportation. These stressors disrupt gut microbiota balance, promoting pathogenic bacteria while reducing beneficial populations like Lactobacilli<\/em> and Bifidobacteria<\/em>.<\/p>\n
Bello et al. (2017) studied the effects of dietary tryptophan under transport stress in broilers. The results showed that increased tryptophan levels:<\/p>\n
- \n
- Reduced heat shock protein 70 (HSP70) and corticosterone (CORT)<\/li>\n
- Increased serotonin (5-HT) levels<\/li>\n
- Improved stress resilience and animal welfare<\/li>\n<\/ul>\n
Interestingly, tryptophan also exhibited prebiotic-like effects<\/strong>, increasing beneficial bacteria such as Bifidobacteria<\/em> and Enterococci<\/em>, while reducing pathogens including E. coli<\/em>, Clostridia<\/em>, Enterobacteria<\/em>, and Campylobacter<\/em>.<\/p>\n
![\"\"](\"https:\/\/www.poultryindonesia.com\/wp-content\/uploads\/2026\/04\/Adv_-CJ-BIO-APRIL26-tabel.jpg\")
<\/p>\n
\nTryptophan Under Lighting Stress Conditions<\/h3>\n
In modern broiler systems, extended or continuous lighting programs are commonly used to maximize feed intake and growth (Yang et al., 2015). However, prolonged light exposure is associated with increased intestinal inflammation and physiological stress (Yu et al., 2013).<\/p>\n
Ma et al. (2024) investigated the anti-inflammatory effects of tryptophan supplementation in broilers exposed to long photoperiods. The study found that tryptophan:<\/p>\n
- \n
- Reduced intestinal inflammation<\/li>\n
- Inhibited activation of the NLRP3 inflammasome<\/li>\n<\/ul>\n
Metabolomic analysis revealed increased levels of beneficial microbial metabolites such as indole-3-acetic acid (IAA) and indole-3-lactic acid (ILA), and decreased xanthurenic acid (XA). These changes contributed to the observed protective effects on gut tissue.<\/p>\n
![\"\"](\"https:\/\/www.poultryindonesia.com\/wp-content\/uploads\/2026\/04\/Adv_-CJ-BIO-APRIL26-1.jpg\")
<\/p>\n
\nConclusion<\/h3>\n
Tryptophan is more than just a limiting amino acid\u2014it plays a multifunctional role in metabolism, immunity, and gut health. Its involvement in serotonin production, immune modulation, and microbiota balance makes it a valuable nutritional tool, particularly under stress conditions such as disease challenges, transportation, and intensive production systems.<\/p>\n
Optimizing tryptophan levels in feed represents a promising strategy to improve animal performance, enhance resilience to stress, and maintain gut health in modern livestock production.<\/p>\n","protected":false},"excerpt":{"rendered":"
Tryptophan Protects the Gut During Enteric Disease Enteric diseases remain a major challenge in livestock production and are often caused by complex interactions among viruses, bacteria, and parasites. These conditions can lead to significant economic losses due to reduced growth performance, poor feed conversion, and increased mortality. Common enteric diseases include necrotic enteritis, coccidiosis, and […]<\/p>\n","protected":false},"author":4,"featured_media":27397,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"cybocfi_hide_featured_image":"","spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[37],"tags":[],"yoast_head":"\n\n\n\n\n\n\n\n\n\n\n\n\t\n\t\n\n\n\t\n