This review aimed to study and discuss the effects of organic and inorganic sources of trace minerals; zinc, copper, and manganese in the diet of laying hens on egg production and quality. These trace minerals are required in producing proteins that are involved in various biochemical reactions, hormone secretion pathways, eggshell formation, antioxidative properties, immune system defence, etc. The results of different studies were not always consistent, mainly concerning the egg quality indices; however, most of the findings have shown positive effects of these trace minerals on laying hens. Recent studies have shown organic minerals are a more effective source than inorganic. The benefit of using organic sources is their lower inclusion rates due to their better absorption rate and the low output through excreta.
The very high exotic or genetic value made pet birds, likecanaries, parakeets, and parrots a choice for trade across countries and continents, and the capability of these birds to act aspotential carriers or transmitters of zoonotic diseases contributes a significant threat to humans. Birds are characterized and known for their susceptibility, transmission, and maintenance of pathogens that are zoonotic to humans. Some of the zoonotic diseases they spread, such as highly pathogenic avian influenza (HPAI), salmonellosis, and chlamydophilosishave a significant impact on human health and these things make this issue a one health concern. Zoonotic diseases among birds areclassified as bacterial, viral, fungal, and of parasitic origin. The intensity with which they affect humans varies according to their pathogenicity and virulence. The awareness of pet bird zoonosesis of prime importance while trading or domesticating the bird, which will help to understand their potential fordiseases and install preventive measures accordingly. This review paper aims to educate readers about the risks faced by bird owners and the public by describing several instances of bird-human disease transmission and the characteristicsymptoms of those diseases.
Egg yolk represents an alternate source of antibody and provides some advantages over mammalian serum immunoglobulins. The principal immunoglobulin in avian blood is Immunoglobulin Y (IgY) and is transferred to egg yolk and then to their offspring and thus makes it possible for the non-invasive harvesting of antibodies in higher amount from eggs. Moreover, due to the structural differences and phylogenetic variations, IgY is more acceptable than mammalian antibodies for diagnostic purposes, as it does not interfere with mammalian antibodies and shows greater avidity for proteins retained in mammals. As a therapeutic and diagnostic tool, IgY has wide application in animal and human health. The emergence of drug resistance organisms causing respiratory tract infections is a critical problem for the health care system worldwide. Passive immunization is a potential alternative for this. Recent studies on the diagnosis and therapeutic effects of IgY against SARS-CoV-2 indicates the importance of this technique in the present context. This review refers to the use of IgY antibodies from chicken egg yolks against the infection caused by bacteria, viruses (including SARS-CoV-2) and parasites in human beings and in animals in addition to its use in food preservation, anti tumour and anti allergic activities.
Keywords: Egg yolk antibodies (IgY); human health; SARS-CoV-2; Egg yolk
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