**1. Introduction**

Broiler production is based on increasing meat quality, improving the characteristics of the chicken meat. Characteristics such as appearance, texture, juiciness, watery, firmness, tenderness, odor, and flavor of the meat are important for the consumer's judgment before and after purchasing a meat product. However, quantifiable meat properties, such as water-holding capacity (WHC), shear force, drip loss, cooking loss, pH, and shelf life, are indispensable for the processing of meat products with added value. Many research was carried out as an alternative to improve the quantity, quality, and homogeneity of farm animals and their products. The use of additives can contribute to improving animal performance and meat quality parameters. One of these alternatives is the supplementation of nanoparticles, probiotics, and prebiotics in the diet of broiler chickens.

In this review, general aspects of the use of nanoparticles, probiotics, and prebiotics in poultry feed are reported.

### **2. Nanoparticles**

Nanomaterials are being used in agriculture, feed, and food [1]. Some are stable at high temperature and pressure [2] and can be easily assimilated into the digestive system [3]. The action mode of the nanoparticles depends mainly on many factors,

such as particle size, sizes smaller than 300 nm spread in the blood, but particles smaller than 100 nm reach tissues [4]. Thus, there is better interaction with other biologically active substances due to a larger surface area *in vivo* [5]. Other factors, such as the solubility of particles and fillers, are important. Nanoparticles can be administered by ingestion or inhalation and exercise their actions in different ways [6]. According to Gao and Matsui [7], nanoparticles have unprecedented properties, such as large specific surface area, high surface activity, many taut centers, and high catalytic efficiency. There are indications that nanoparticles and minerals can increase absorption [8].

Silver nanoparticles exhibit a strong antimicrobial effect [9]. On the other hand, the use of nano-minerals, such as nano-selenium, nano-chromium, or nano-zinc, can improve the parameters of animal production, their healthiness, and the quality of the products obtained from them, research has shown better effects in relation to the inorganic salts of these elements and chelates used on a large scale in the animal feed industry [10]. Considering this, in the livestock industry, research was conducted to improve the composition and quality of meat. Thus, the enrichment of feed with nanoparticles and their effects on meat properties were evaluated.
