Hayvan Sağlığında Mikrobiyota ve İşlevi
Özet
Bu derleme çalışması, hayvanlarda mikrobiyotanın tanımını, yapısını, çeşitliliğini, üstlendiği biyolojik işlevleri ve konak sağlığı ile olan çok yönlü ilişkisini kapsamlı bir şekilde incelemektedir. Doğumla birlikte şekillenmeye başlayan mikrobiyota; başta gastrointestinal sistem olmak üzere deri, solunum ve ürogenital sistem gibi farklı organ ve dokularda kolonize olan karmaşık mikrobiyal topluluklardan oluşmaktadır. Mikrobiyotanın kararlı yapısının bozulması olarak tanımlanan disbiyozis durumu, bağışıklık sistemini, metabolizmayı, üreme sağlığını ve genel hayvan refahını olumsuz yönde etkilemektedir. Beslenme biçimi, barınma koşulları, mevsimsel değişiklikler ve ilaç kullanımı gibi çevresel etmenler ile yaş, ırk, cinsiyet ve genetik yapı gibi konakçıya özgü faktörler mikrobiyota kompozisyonunun şekillenmesinde rol oynamaktadır. Bağırsak-beyin ekseni aracılığıyla merkezi sinir sistemiyle çift yönlü iletişim kuran mikrobiyota, konak davranışları, stres yanıtları ve bilişsel süreçler üzerinde de belirleyici bir etkiye sahiptir. Ayrıca kanatlı hayvanlar, ruminantlar ve domuzlarda yürütülen metagenomik araştırmalar, sağlıklı bir mikrobiyal kompozisyonun patojen kolonizasyonunu baskıladığını, selüloz ve nişasta fermantasyonu ile uçucu yağ asitlerinin üretimini sağladığını, yemden yararlanma oranını artırdığını ve et, süt ile yumurta verimliliğini yükselttiğini ortaya koymaktadır. Sonuç olarak, hayvan mikrobiyotasının güncel durumunun takibi ve rasyon düzenlemeleriyle modüle edilmesi, hastalıklardan korunma, hayvan sağlığının geliştirilmesi ve hayvancılıkta ekonomik verimliliğin artırılması açısından kritik bir önem taşımaktadır.
This review study comprehensively examines the definition, structure, diversity, biological functions, and multifaceted relationship of the microbiota in animals with host health. Beginning to take shape at birth, the microbiota consists of complex microbial communities that colonize various organs and tissues, primarily the gastrointestinal system, as well as the skin, respiratory, and urogenital systems. The disruption of the stable microbiota structure, defined as dysbiosis, adversely affects the immune system, metabolism, reproductive health, and overall animal welfare. Environmental factors such as diet, housing conditions, seasonal changes, and medication use, alongside host-specific factors like age, breed, sex, and genetic structure, play a key role in shaping microbiota composition. Communicating bi-directionally with the central nervous system via the gut-brain axis, the microbiota also exerts a decisive influence on host behavior, stress responses, and cognitive processes. Furthermore, metagenomic research in poultry, ruminants, and swine reveals that a healthy microbial composition suppresses pathogen colonization, enables volatile fatty acid production through cellulose and starch fermentation, enhances feed efficiency, and improves meat, milk, and egg yields. In conclusion, monitoring the status of animal microbiota and modulating it through ration adjustments carries critical importance for disease prevention, animal health enhancement, and increasing economic productivity in livestock farming.
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