G. Ahmet ÖNOL, Mehmet DAŞKIRAN, ÖZCAN CENGİZ, AHMET NAZLIGÜL, Mustafa SARI

Sıcaklık stresi altındaki erken yumurtlama döneminde olan tavukların rasyonlarına E vitamini ve lizin katkısının performans ve yumurta kabuk özellikleri üzerine etkisi

Bu araştırma, sıcak stresinde erken yumurtlama dönemindeki yumurtacı tavuk rasyonlarına gereksinim düzeyine ek olarak E vitamini ve/veya lizin katkısının performans ve bazı yumurta kalite özellikleri üzerine etkisini belirlemek amacıyla yapıldı. Araştırmada toplam 160 adet 20 haftalık yaşta yumurta tipi tavuk (Nick Chick) kullanıldı. Deneme her birinde 40 adet tavuk bulunan dört grup ile yürütüldü. Her bir deneme grubu için 10 alt grup oluşturuldu. Mısır-soya küspesine dayalı hazırlanan kontrol grubu rasyonuna 250 mg/kg E vitamini, %0.15 lizin ve 250 mg/kg E vitamini + %0.15 lizin ilave edilerek deneme grubu rasyonları oluşturuldu. Deneme, tavukların 20-27 haftalık yaşta olduğu sıcak stresi (SS) dönemi ve 28-36 haftalık yaşta olduğu optimal çevre sıcaklığı (OÇS) dönemi olmak üzere toplam 17 hafta sürdürüldü. Rasyona E vitamini katkısı SS dönemi ve SS ile OÇS dönemleri ortalaması gözönüne alındığında yumurta kabuk kalınlığını her iki dönemde (P

Anahtar Kelimeler:

diyetler, yumurta üretimi, yumurta kalitesi, yumurta kabuğu, yumurta kabuğu kalitesi, yumurta kabuğu kalınlığı, yumurta, çevre sıcaklığı, yem zenginleştiriciler, tavuk beslenmesi, sıcaklık stresi, yumurta tavuğu, yumurtlama performansı, lizin, besin maddesi gereksinimi, kümes hayvanları, stres yanıtı, E vitamini

Effects of dietary vitamin E and lysine supplementation on performance and egg shell quality parameters of heat stressed laying hens in early laying period

This experiment was conducted to determine the effects of vitamin E and/or lysine supplementation over their requirement levels in layer ration on performance and some egg quality characteristics of hens raised under heat stress conditions at early laying period. A total of 160 20-week-old layers (Nick Chick) were used in the study. There were four treatment groups each containing 40 layers in the experiment. Each treatment group was consisted of 10 replicates. Treatment groups were formed by inclusion of 250 mg/kg vitamin E, 0.15% lysine, and 250 mg/kg vitamin E plus 0.15% lysine into corn-soybean meal based control diet. The duration of the experiment was 17 weeks and it consisted of a heat stress from 20 to 27th week of age and optimal environmental temperature from 28 to 36th week of age periods. Dietary vitamin E supplementation increased egg shell thickness (P<0.001) for both periods and egg shell weight (P<0.01) in heat stress period only and a numerical increase compared to control group and showed significance (P<0.01) as compared to rest of the dietary treatments throughout the experiment. Dietary lysine supplementation increased egg production in both heat stress and optimal environmental temperature periods (P<0.05). This positive effect on egg production was not seen in group with dietary vitamin E plus lysine supplementation. In conclusion, vitamin E supplementation above the requirement levels in layer rations improved egg shell quality whereas neither vitamin E nor lysine supplementation had any positive impact on the parameters investigated in layers at early laying period raised during and post-heat stress periods.

Keywords:

diets, egg production, egg quality, egg shell, egg shell quality, egg shell thickness, eggs, environmental temperature, feed supplements, fowl feeding, heat stress, hens, laying performance, lysine, nutrient requirements, poultry, stress response, vitamin E,

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