Geç Dönemde Organik Asit İlavesinin Yumurtlama Performansı, Yumurta Kalite Özellikleri ve Bağırsak pH’sı Üzerine Etkisi

Bu calisma gec donemdeki yumurtaci tavuk rasyonlarina degisik seviyelerde organik asit karisimi (OAK) (70% propiyonik asit, 5% sitrik asit, 25% soft asit) ilavesinin yumurtlama performansi, yumurta kalitesi ve bagirsak pH’si uzerine etkisini belirlemek amaciyla yurutulmustur. Toplam 96 adet 74 haftalik yastaki Lohmann ticari yumurta tavugu her biri alti alt gruptan olusan ve her alt grupta dort hayvan bulunan dort deneme grubuna sansa bagli olarak dagitilmistir. Kontrol grubu bazal rasyonla (K), deneme gruplari ise sirasiyla bazal diyete, 1.5 (P1), 3.0 (P2) ve 4.5 (P3) kg/ton yem olacak sekilde OAK ilaveleriyle olusturulan rasyonlarla 1 haftasi deneme yemlerine alistirma periyodu olmak uzere toplam 13 hafta sureyle beslenmislerdir. Rasyona OAK ilavesi hasarli yumurta oranini onemli derecede dusurmus ve yumurta agirligini artirmistir. Gunluk yem tuketimi, yumurta verimi ve yemden yararlanma orani uzerine herhangi bir etkisi olmamistir. Bagirsak ici pH degeri rasyona OAK ilavesi ile kontrol grubuna gore daha dusuk olmustur. Yumurta kalite kriterlerinden sekil indeksi, kabuk kalinligi, kabuk agirligi, sari rengi, ak indeks ve Haugh birimi degerlerinin rasyona OAK ilavesinden etkilenmedigi belirlenmistir. Rasyona 4.5 kg/ton duzeyinde OAK ilavesi kabuk kirilma mukavemetini ve sari indeksi degerlerini artirirken, bagirsak ici pH’sini onemli derecede dusurmustur. Calismadan elde edilen sonuclara gore, gec donemdeki yumurtaci tavuk rasyonlarina 4.5 kg/ton seviyesinde OAK ilavesinin onemli bir kalite kriteri olan kirilma mukavemetini iyilestirilebilecegi soylenebilir. Anahtar Kelimeler: Organik asit, Yumurtaci Tavuk, Performans, Yumurta Kalitesi, Bagirsak pH’si Effect of Organic Acid Mixture Supplementation at Different Levels to Diet of Laying Hens in Late Production Stage on Performance, Egg Quality Features and Intestinal pH This study was conducted to determine the effects of organic acid mixture (OAM) (70% propionic acid, 5% citric acid, 25% soft acid) supplementation at various levels on performance, egg quality features and intestinal pH in late production stage of laying. Total 96 Lohman layers, 74 weeks old age, were divided into four groups. Each treatment group was replicated 6 cages and each containing 4 hens. The hens were fed either a control diet or supplemented with 1.5 (P1), 3 (P2) or 4.5 (P3) kg/ton OAM of feed for 13 weeks. Dietary OAM supplementation significantly decrased cracked egg yield and increased egg weight, but did not affect feed intake, egg production and feed conversion ratio. OAM supplementation significantly decreased the intestinal pH. Egg quality indices as shape index, shell thickness, shell weight, yolk color, albumen index and Haught unit were not affected statistically by dietary OAM. Supplemented 4.5 kg/ton OAM in layer diet increased yolk index and shell strenght and significantly decreased intestinal pH of treatment groups. Results obtained from present sutdy showed that supplementation of 4.5 kg/ton OAM to diets of late production stage laying hens can be beneficial to improve egg quality tarits especially such as shell strenght. Key Words : Organic acid, Layer, Performance, Egg Quality, Intestinal pH