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The producers aim to improve poultry production efficiency and achieve high profitability but have noticed that during commercial production, chicks may be exposed to various microbiological challenges, infection by diseases and oxidative stress, and result in economic and production inefficiencies. Therefore, improving the immune function of chicks by enhancing antioxidant status may contribute to the reduction of morbidity and mortality of birds. Numerous reports have demonstrated that selenium, an important microelement, acts as a natural biological antioxidant that helps in the protection of cellular membranes against oxidative damage and ameliorates bird growth and health (Suraï and Dvorska, 2002; Levkut et al., 2009; Pilarczyk et al., 2012; Khan et al., 2015; 2016). Unfortunately, traditional forms of selenium supplements, in general, have low levels of absorption and increase toxicity (Raza, 2012; Jamil, 2013; Khan et al., 2016). Furthermore, the lack of this microelement leads to numerous metabolic disorders and diseases through its negative effect on the physiological status of the chicks (Cai et al., 2012). Subsequently, delivering a proper amount of this microelement to chicks’ body is important for physiological enzymatic, hormonal and immune processes (Keen et al., 2004). ABSTRACT. This study aimed to explore impacts of in ovo injection and dietary supplementation of selenium nanoparticles (SeNPs) on physiological responses, immunological status and performance of broiler chicks. A total of 210 broiler eggs were divided into 3 in ovo groups: not in ovo injected and in ovo injected with 5 or 10 ppb SeNPs. The hatched chicks from each in ovo group were divided into 2 dietary groups, with or without 10 ppb SeNPs/kg ration for 5 weeks. Live body weight and body weight gain were significantly increased in all SeNPs injected or supplemented groups. Feed conversion ratio for the whole feeding period was improved by SeNPs feed supplementation. Serum triglycerides and malondialdehyde contents were significantly decreased, while high-density lipoprotein cholesterol, immunoglobulin status, reduced glutathione content and glutathione reductase activity were increased by both examined routes of SeNPs delivery. It can be concluded that SeNPs in ovo injection with a dose up to 10 ppb/egg along with SeNPs diet supplementation at a dose of 10 ppb/kg had a positive effect on performance and physiological, antioxidant and immunological status of broiler chicks. Received: 12 August 2019 Revised: 5 December 2019 Accepted: 9 March 2020

journal of animal and feed sciences

&lt;i&gt;In-ovo&lt;/i&gt; and dietary supplementation of selenium nano-particles influence physiological responses, immunological status and performance of broiler chicks