The effect of in ovo delivery of nutrients and feed additives on the development of the immune system

本文主要研究在蛋蛋中添加维生素和益生菌对鸡胚的影响。刚孵出的小鸡受到各种形式的压力，使它们更容易感染病原体。通过早期干预，如在孵化前给予营养和/或有益细菌，可以使雏鸡更健康。更具体地说，我们打算采取一种系统的方法，研究这些干预措施如何增强鸡的免疫系统健康。对鸡蛋营养的研究表明，鸡蛋的孵化重量和生长、消化能力、孵化后死亡率和发病率都有所改善，免疫反应也有所改善。益生菌已被证明可以提高生长性能和饲料效率，抗体反应，并限制食源性病原体。鉴于营养物质和益生菌刺激肠道和免疫系统发育的潜力，卵内处理可以为病原体定植提供天然屏障，加速肠道和免疫系统的发育，从而提高鸟类的生长和健康。鉴于在蛋内常规使用各种疫苗，除了对健康和生产性能产生积极影响外，在蛋内使用的任何其他疫苗不得干扰疫苗效力。

The research proposed here focuses on in ovo supplementation of chick embryos with vitamins and probiotic bacteria. Newly hatched chicks are subject to various forms of stress that make them more susceptible to pathogens. Chicks can be made healthier by early interventions, such as by pre-hatch administration of nutrients and/or beneficial bacteria. More specifically, we intend to take a systematic approach and examine how these interventions can enhance the chicken's immune system health. Research into in ovo nutrition has demonstrated improvements in hatch weight and growth, digestive capacity, reduced post-hatch mortality and morbidity, and improved immune response. Probiotics have been shown to improve growth performance and feed efficiency, antibody response, and to limit food-borne pathogens. Given the potential of nutrients and probiotics to stimulate intestinal and immune system development, in ovo treatment could provide a natural barrier to pathogen colonization and allow accelerated intestinal and immune system development resulting in increased growth and health of birds. Given the routine in ovo use of various vaccines, anything else administered in ovo, in addition to having a positive effect on health and performance, must not interfere with vaccine efficacy.