Mogućnost smanjenja udjela pigmenata kantaksantina u hrani tovnih pilića

master's thesis

• Title (english): The possibility of reducing the content of pigments of contaxantin in the feeding of broiler chickens
• Author: Luka Dlesk
• Mentor: Zlatko Janječić (mentor)
• Committee member: Zlatko Janječić (predsjednik povjerenstva)
• Committee member: Dalibor Bedeković (član povjerenstva)
• Committee member: Ivica Kos (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Animal Nutrition); Zagreb
• Defense date and country: 2019-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Kako bi se zadovoljile želje kupaca za što intenzivnije žuto-zlatnom bojom kože kod tovnih pilića pribjegava se korištenju pigmenata u krmnim smjesama za njihovu hranidbu. Dosadašnje spoznaje govore da je upotrebom organskih minerala u krmnim smjesama moguće ostvariti poželjnu boju kože tovnih pilića i uz smanjenu upotrebu pigmenata kantaksantina od one uobičajene razine od 80 mg/kg krmne smjese. Cilj ovog diplomskog rada bio je utvrditi utjecaj smanjenja dodatka pigmenta kantaksantina u krmnim smjesama na boju kože tovnih pilića. U istraživanju je korišteno 240 jednodnevnih muških Ross pilića koji su slučajnim izborom podijeljeni u tri tretmana u četiri ponavljanja (ukupno 12 skupina) sa po 20 pilića. Hranidbeni tretman A sadržavao je 80 mg pigmenta kantaksantina po kg smjese, tretman B je sadržavao 60 mg kantaksantina, a tretman C 40 mg kantaksantina po kg smjese. Iz ostvarenih prosječnih tjelesnih masa tijekom istraživanja, konverzija krmne smjese i mortaliteta vidljivo je da hranidbeni tretman nije imao značajan (p>0,05) utjecaj na njihove vrijednosti. Temeljem rezultata ispitivanja boje kože jedan sat nakon klanja i 24 sata nakon hlađenja u dobi pilića od 40 dana možemo zaključiti da su sva tri tretmana imala ujednačene vrijednosti svjetline (L*) i crvenila (a*) koje se nisu značajno razlikovale između tretmana (p>0,05). Tretman A je imao žuću (veća vrijednost žutila b*) i zasićeniju boju kože jedan sat nakon klanja i 24 sata nakon hlađenja u dobi pilića od 40 dana (p<0,05), i kao takva se ne može preporučiti kao prihvatljiva za kupce. Prihvatljivija boja kože je utvrđena kod tretmana B. Stoga se smanjenje pigmenta kantaksantina na 60 mg/kg uz upotrebu organskih minerala može preporučiti u hranidbi tovnih pilića do dobi od 40 dana. Potrebna je provedba daljnjih istraživanja u kojima bi se kod ciljanih tretmana trebala utvrditi dob pilića u kojoj bi s dodavanjem boje trebalo započeti, kako bi boja kože i prsnog mišića na kraju tova bila zadovoljavajuća i prihvatljiva kupcima.

Abstract (english)

In order to satisfy customers' desires for the most intense yellow gold color in fattening chicks, pigments in compound feeds are used. The present experience indicates that the use of organic minerals in forages can achieve the desired skin color of fattening chickens and with the reduced use of canthaxanthin pigments from the usual level of 80 mg / kg of compound feed. The aim of this thesis was to determine the effect of the reduction of the feed of pigment cantaxanthin in feed mixture on the color of the chicken skin. The study used 240 one-day-old male Ross chickens randomly divided into three treatments in four replications (12 groups total) of 20 chickens each. Feeding treatment A had 80 mg cantaxanthin per kg of feed mixture, treatment B had 60 cantaxanthin, a treatment C kad 40 mg cantaxanthin per kg of fed mixture. From the achieved average body weights during the study, feed conversion and mortality, it was evident that nutritional treatment had no significant (p <0.05) effect on their values. Based on the results of skin color testing one hour after slaughter and 24 hours after cooling at 40 days of age, we can conclude that all three treatments had uniform lightness (L*) and redness (a*) values that did not differ significantly between treatments (p> 0.05). Treatment A had a yellower (higher yellowness values b*) and more saturated skin color one hour after slaughter and 24 hours after cooling at 40 days of age (p <0.05), and as such cannot be recommended as acceptable to customers. Much more acceptable skin color was in treatment B. Therefore, reducing the canthaxanthin content to 60 mg / kg with organic minerals may be recommended in the feeding of fattening chickens up to 40 days of age. Further research is needed to determine ideal chick age when pigments for color should be added to ensure that the color of the skin and pectoral muscle at the end of fattening is satisfactory and acceptable to customers.

• Keywords: kantaksantin; hranidba; tovni pilići; boja kože
• Keywords (english): canthaxanthin; feeding; fattening chicks; skin color
• Language: croatian
• URN:NBN: urn:nbn:hr:204:775006
• Study programme: Title: Animal Nutrition and Feed Science; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka hranidbe životinja i hrane (magistar/ magistra inženjer/inženjerka hranidbe životinja i hrane)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2019-12-09 11:06:15