Utjecaj različite koncentracije umjetnog pigmenta i organskih minerala na boju žutanjka i sadržaj karotenoida

master's thesis

• Title (english): Influence of different concentrations of artificial pigments and organic minerals in the color of egg yolk and contents of carotenoids
• Author: Luka Cvetić
• Mentor: Zlatko Janječić (mentor)
• Committee member: Zlatko Janječić (predsjednik povjerenstva)
• Committee member: Jasna Pintar (član povjerenstva)
• Committee member: Dalibor Bedeković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Animal Nutrition); Zagreb
• Defense date and country: 2019-09-12, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Očekivanja kupaca konzumnih jaja glede obojenosti žutanjaka teže ka tome da oni budu što intenzivnije žute odnosno narančaste boje. Da bi to postigli proizvođači konzumnih jaja koriste krmne smjese u koje se dodaju umjetni pigmenti. Cilj ovog diplomskog rada je utvrdit iutjecaj dodataka različitih koncentracija umjetnog pigmenta i organskih minerala na obojenost žutanjaka i sadržaj karotenoida. U istraživanju je korišteno 36 Tetra hibridnih kokoši podijeljenih u 4 skupine. Svaka skupina kokoši nesilica hranjena je s krmnom smjesom koja je sadržavala različite koncentracije umjetnog pigmenta Canthaxanthin (A-8 mg; B-6 mg; C-4 mg i D-0 mg), te umjesto anorganskih organske minerale. Istraživanje je trajalo 6 tjedana pri čemu su prikupljeni podaci o broju i masi jaja te konzumaciji i konverziji krmne smjese. Na temelju dobivenih rezultata tijekom istraživanja može se zaključiti da hranidbeni tretman nije imao utjecaj na porast tjelesnih masa kokoši nesilica tijekom istraživanja, hranidbeni tretman nije imao utjecaj na prosječnu dnevnu konzumaciju krmne smjese po nesilici. Obojenost žutanjka je bila iako neprirodna, najveća kod tretmana A, kod tretmana B i C prihvatljiva dok je kod tretmana D obojenost bila najslabija, a sadržaj karotenoida u žutanjcima bio je kroz cijelo vrijeme istraživanja najveći kod tretmana A, a najniži kod tretmana D. Za hranidbu kokoši nesilica može se preporučiti upotreba krmnih smjesa koje sadrže 6 odnosno 4 mg umjetnog pigmenta Canthaxanthin kao što je to učinjeno u tretmanima B i C ukoliko je cilj postizanje željene obojenosti žutanjka koja će biti prihvatljiva potrošačima.

Abstract (english)

Egg consumers expectations regard to egg yolk color tend to be more intense yellow or orange colors. In order to achieve this, the egg producers use the feed with artificial pigments.The aim of this graduate thesis is to determine the influence of additives in different concentrations of artificial pigment and organic minerals on egg yolk color and carotenoid content. In research was 36 Tetra hybrid layers which were divided into 4 groups. Each group of chickens in the feed mixture obtained different concentrations of artificial pigment Canthaxanthin (A-8 mg; B-6 mg; C-4 mg and D-0 mg) and instead of inorganic minerals, organic minerals were given. The study lasted for 6 weeks. Based on the results obtained during the research, it can be concluded that the nutrition treatment did not have an effect on the body mass of chickens during the study. The nutrition treatment had no effect on the average daily consumption of the feed, the coloration of the egg yolk was highest in group A, at treatments B and C acceptable, while in treatment D the coloration was the weakest. Carotenoid content in egg yolk was highest in treatment A an dthe lowest in treatment D. Based on all of the foregoing, it is apparent that the reduction in the proportion of artificial pigment in feed for laying hens can be recommended as done in treatments B and C if it is to achieve the desired egg yolk color that will be acceptable to consumers.

• Keywords: canthaxanthin; žutanjak; kokoši nesilice; karotenoidi
• Keywords (english): canthaxanthin; egg yolk; layers; carotenoid
• Language: croatian
• URN:NBN: urn:nbn:hr:204:887971
• Study programme: Title: Production and Processing of Meat; Study programme type: university; Study level: graduate; Academic / professional title: magistar / magistra inženjer/inženjerka proizvodnje i prerade mesa (magistar / magistra inženjer/inženjerka proizvodnje i prerade mesa)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2019-12-03 11:16:46