Researches on the responses of different hybrid layers with respect to egg production and quality performances to forced molting programs with and without feed withdrawal

Bu araştırma, yonca unu katkılı arpa esaslı, kepek esaslı ve yulaf esaslı üç adet yem çekmesiz ve bir adet yem çekmeli olmak üzere toplam 4 adet zorlamalı tüy döküm programının, 57 haftalık yaştaki 320 adet kahverengi (H&N Brown Nick) ve 320 adet beyaz (Hy-Line W-36) yumurtacı hibritlerde yumurta verim ve kalite performansları üzerine etkilerini incelemek üzere yapılmıştır. Araştırma, 6 haftası zorlanım peryodu, 40 haftası da verim dönemi olmak üzere toplam 46 hafta sürdürül-müştür. Elde edilen sonuçlara gore, zorlanım peryodunda genotipin, canlı ağırlık kaybı (P

Anahtar Kelimeler:

yumurta kalitesi, yemleme, yumurta üretimi, yumurta tavuğu, yumurtlama performansı, yem formulasyonu

Farklı yumurtacı hibritlerin, yem çekmeli ve çekmesiz zorlamalı tüy dökümü programlarına, yumurta verim ve kalite performansları bakımından tepkileri üzerine araştırmalar

This research was carried out to determine the effects of four forced molting programs including three non-feed with-drawal programs (BB: barley based, WB: wheat bran based and OB: oat based) which supplied with alfalfa meal and one feed withdrawal method (FW: control 8 d FW+34 d resting diet) on egg production and egg quality performances of 320 brown (H&N Brown Nick) and 320 white (Hy-Line W-36) hybrid layers at 57 week of age. The experiment lasted totally 46 wk including for a 6 wk molting period followed by a 40 wk post molt production period. According to the results obtained; the genotype had significant (P<0.05) effect on body weight loss, feed consumption, hen day egg production (number, %), cracked egg (%) and heterophil:lymphocyte (H:L) ratio (P<0.01) in molting period. Molting methods had significant (P<0.01) effects on body weight loss, feed consumption, hen-day egg production (number, %), pancreas weight ratio in molting period. In the production period; BB group had lower (P<0.05) hen-day egg produc-tion (%) than those of OB and FW groups. Feed efficiency values of WB group were better (P<0.05) than the values of OB and FW groups. Hens molted by FW treatment had lower (P<0.05) albumen height and Haugh units than other treatments. As conclusion, after examining these production and quality criteria, it can be stated that; non feed withdrawal methods, especially OB program can be used alternative to FW program. But, other non-feed withdrawal programs also can be used successfully as molting procedure.

Keywords:

egg quality, feeding, egg production, hens, laying performance, feed formulation,

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