The externalization of animals’ genetic potential is determined by a number of external factors, of which feeding plays a major role. Animals’ nourishment is one of the most important levers to ensure the efficiency of animal production due to both the high share of feed costs in the total cost of products and the influence this has on the growth, reproduction, and health of animals as well as the quality of products obtained from these. This field is one of the most dynamic in the field of husbandry sciences due to the takeover and permanent use of numerous results obtained from research on energy metabolism and nutrients related to the composition of feed and its influence on animal products. This is also due to the great advances in genetics, which create new types of animals with increasing productive potential, but also with different food requirements. This Special Issue collated innovative papers on animal nutrition, physiology, chemistry, biochemistry, genetics, reproduction, and breeding technologies. The articles covered a wide range of topics related to feed quality, the influence of food on the production level, the quality of production, and also on animals’ health.

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Phages have shown a high biotechnological potential with numerous applications. The advent of high-resolution microscopy techniques aligned with omic and molecular tools have revealed innovative phage features and enabled new processes that can be further exploited for biotechnological applications in a wide variety of fields. The high-quality original articles and reviews presented in this Special Issue demonstrate the incredible potential of phages and their derived proteins in a wide range of biotechnological applications for human benefit. Considering the emergence of amazing new available bioengineering tools and the high abundance of phages and the multitude of phage proteins yet to be discovered and studied, we believe that the upcoming years will present us with many more fascinating and new previously unimagined phage-based biotechnological applications.

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In 2019, we sent out a call for submissions to a Special Issue of Marine Drugs entitled “Marine Chitin 2019”, and we are pleased that this issue has now been published. Over 16 high-impact papers were included in this issue, which we now plan to publish as a book. In addition, we now seek to publish a further Special Issue of Marine Drugs, “Marine Chitin 2020–2021”. As before, we plan to produce an authoritative and exciting issue that will encompass breakthroughs in scientific and industrial chitin and chitosan research. Significant advances in chitin and chitosan research have been made since the 1970s, and current overviews in recent publications involving chitin and chitosan research advances are in need of an update.

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The aim of this Special Issue is to publish high quality papers concerning poultry nutrition and the interrelations between nutrition, metabolism, microbiota and the health of poultry. Therefore, I invite submissions of recent findings, as original research or reviews, on poultry nutrition, including, but not limited to, the following areas: the effect of feeding on poultry meat end egg quality; nutrient requirements of poultry; the use of functional feed additives to improve gut health and immune status; microbiota; nutraceuticals; soybean meal replacers as alternative sources of protein for poultry; the effects of feeding poultry on environmental impacts; the use of feed/food by-products in poultry diet; and feed technology.

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