poultry broilers conference microbiota amino acids swine pigs aa bacteria gut health webinar chickens enzymes net energy inflammation advancia 2018 digestibility fibres advancia academy proteins formulation oxidative stress roundtable immunity performance variability energy ne espn 2019 meat quality methionine birds q&a lysine sustainability lys probiotics genetics met metabolites health butyrate intestine fibers interactions antibiotics layers environment nutrition heat stress feed intake digestible oxidation requirements pathogens diets models human health digestion functions metabolizable quality questions formulating selenium piglets nutrients raw materials feed ros intestines phosphorus short educational videos subtitles sev mucin antioxidants balance advancia me prebiotics arabinoxylans caecum dietary fibers myopathy mucosa myopathies challenges p phytate metabolism immune system dairy cows diet tight junctions laying hens introduction biomarkers sows agp interview milk yield pathways don selection supplementation immune response nspase fat zea production growth cows ergot gastro-intestinal tract europe heterogeneity git portuguese intestinal health sow efficiency age short chain fatty acids microbiome antibiotic reduction se nutritive values selenoproteins nsp measurement ihsig nitrogen additives genetic selection genes antinutritional factors short educational videos on net energy energia lĂquida substrates changes feedstuffs Ingredients diseases meat defects management regulation mechanisms redox mycotoxin