The research investigates the possibilities of enriching eggs with n-3 polyunsaturated fatty acids, selenium, vitamin E, and lutein. The research was carried out on 100 TETRA SL laying hens divided into two groups (C and E). Hens in treatment C (control group) were fed a standard feeding mixture that contained 5% soybean oil, 0.32 mg/kg organic selenium, 25.20 mg/kg vitamin E, and 20.5 mg/kg lutein (Marigold flower extract). Hens in treatment E (experimental group) were fed a mixture in which soybean oil was replaced by 1.5% fish oil + 1.5% rapeseed oil + 2.0% linseed oil. The content of other nutricines amounted to 0.47 mg/kg organic selenium, 125.2 mg/kg vitamin E, and 120.5 mg/kg lutein. Portions of total n-3 polyunsaturated fatty acids in enriched eggs were significantly increased when compared to conventional eggs (480.65: 204.58 mg/100 g; p < 0.001). The content of selenium, vitamin E, and lutein was significantly higher (p < 0.001) in enriched eggs than in conventional eggs. The content of selenium in egg albumen was increased by 1.81 times, and in the yolk, it was increased by 1.18 times. At the same time, the content of vitamin E was 2.74 times higher, and lutein was 8.94 times higher in enriched eggs than in conventional eggs.

Consumer demand for high quality and safe foods that will have a positive impact on their health has increased in recent years. Today, it is possible to meet those demands by combining the genetic potential of domestic animals and applying different feeding strategies. Nutrigenomics is one of the “omics” sciences that studies the interaction between nutrients and the genome together with their influence on metabolic and physiological processes in the body. While nutrition of domestic animals is solely based on studying the influence of nutrients on animal health and production traits, nutrigenomics integrates the fields of nutrition, genomics, molecular genetics and bioinformatics. By understanding the molecular relationships between different forms and/or concentrations of nutrients in feed and genes, it is possible to answer the question of how small changes in the diet of farm animals can produce a quality product with positive effects on human health. The aim of this article is to describe how the manipulation of adding different nutrients in the feed affects the expression of different genes in chicken and consequently alters their phenotype.

Karnozin (β-alanil-L-histidin) i anserin (β-alanil-1-metil-L-histidin) su dipeptidi koji imaju značajnu ulogu u fiziološkim funkcijama kod ljudi. Prisutni su u skeletnim mišićima i moždanom tkivu mnogih kralježnjaka. Dizajniranjem krmnih smjesa s povećanim sadržajem aminokiselina L-histidina i β-alanina njihova se koncentracija u mesu tovnih pilića može povećati. Cilj ovog rada bio je ispitati utjecaj genotipa brojlera i vrste mišićnog tkiva na boju mesa i sadržaj karnozina i anserina. Istraživanje je obavljeno na pilićima genotipova Cobb 500 i Ross 308. Ukupno je utovljeno 400 pilića, podijeljenih u dvije pokusne skupine (200 komada Cobb 500 i 200 komada Ross 308). Tov je trajao 42 dana. U tovu su korištene tri komercijalne krmne smjese, starter (21,02 % proteina, do 21. dana), grover (19 % proteina, od 22.-35. dana) i finišer (18,05 % proteina od 36. do 42. dana tova). Nakon klanja i obrade trupova izmjerena je boja mesa prsa i zabataka (CIE L *, CIE a *, CIE b *). Rezultati istraživanja pokazali su da vrsta mišićnog tkiva ima statistički značajan utjecaj na boju mesa (P&lt;0,05), dok genotip ima utjecaja samo na CIE b* vrijednost (P&lt;0,001). Rezultati analize sadržaja karnozina i anserina u uzorcima mesa prsa i zabataka pokazuju da genotip nema utjecaj na sadržaj navedenih dipeptida u mesu (P&gt;0,05), dok vrsta mišićnog tkiva ima značajan utjecaj (P&lt;0,001) na njihovo deponiranje. Ustanovljen je značajno veći sadržaj karnozina (P&lt;0,05) i anserina (P&lt;0,001) u mesu prsa u odnosu na meso zabataka kod oba genotipa pilića.

Background. There are projections that the global population might increase to around 10 billion people by 2050. This will lead to an increase in total global food demand of 35% to 56% between 2010 and 2050. Therefore, one of food producers' main goals should be to increase the quality of food products. Furthermore, current consumer income fluctuations may affect changes in the types of food purchased. The use of natural antioxidants may satisfy the growing interest of poultry consumers. In numerous literature studies, there is a trend toward utilizing natural antioxidants as replacements for synthetic ones. The aim of this study is to provide a review of recent studies which describe the use of natural antioxidants in poultry meat production and their effect on final product quality. Results and conclusion. This review presents an overview of the latest advances in the application of natural antioxidant compounds in poultry meat and processed meat products to improve their quality and shelf-life. In human nutrition and health, antioxidant nutrition remains the topic of a continuing debate. Natural antioxidants efficiently increase the shelf-life of poultry products. Lipid peroxidation decreases in meat when natural antioxidants are supplemented in feed, and the use of natural antioxidants could be an effective strategy to maintain the optimal quality of processed poultry products.

Japanska prepelica (Coturnix coturnix japonica) uzgaja se radi proizvodnje mesa i jaja, a njen uzgoj u Hrvatskoj obavlja se na malim obiteljskim poljoprivrednim gospodarstvima. U znanstvenoj literaturi postoje informacije o kvaliteti prepeličjih jaja i mesa u različitim zemljama svijeta, dok na našem području gotovo da i nema podataka. U radu su prikazani podaci kvalitete prepeličjih jaja iz dva uzgoja na području kontinentalnog dijela Hrvatske. Statistički značajna razlika (P&lt;0,05) u pokazateljima kvalitete jaja prepelica iz dva uzgoja utvrđena je za vrijednosti mase jaja i osnovnih dijelova u jajetu, indeksa oblika, čvrstoće ljuske i pH žumanjaka i bjelanjaka, dok se boja žumanjka, debljina ljuske te udjeli osnovnih dijelova u jajetu nisu značajno razlikovali (P&gt;0,05). Sadržaj kolesterola u žumanjcima prepeličjih jaja u oba uzgoja bio je ujednačen (A=9,3516 mg/g i B=9,2213 mg/g; P&gt;0,05). Ovo istraživanje doprinosi kako znanstvenicima tako i uzgajivačima japanskih prepelica, jer daje korisne podatke o kvaliteti prepeličjih jaja, kojih na ovom području gotovo da nema