2017 Cilt 11 Sayı 32

Permanent URI for this collectionhttps://hdl.handle.net/11452/19336

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Browsing by Department "Veteriner Fakültesi"

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    Effects of age at first access to range area on laying performance and some egg quality traits of free-range laying hens
    (Uludağ Üniversitesi, 2017-08-11) Petek, Metin; Yeşilbağ, Derya; Veteriner Fakültesi; Zootekni Bölümü
    The aim of the study was to determine the effect of age at first range access to range area on laying performance and egg quality of free range layer chickens. Six hundred 16-week-old Lohman Brown layer pullets were randomly distributed into three experimental groups according to age at first range access as 18 (very early), 20 (early) and 22 weeks of age (coventional-late). Three experimental groups were monitored to collect the data from 24 to 72 weeks of age. Egg number, feed consumption, dead birds, cracked and floor eggs were recorded daily. Egg quality analysis was made to 10 week intervals from 30th to 70th weeks of age. Thirty freshly laid eggs from each group were collected in each analysing period and measured within 24 h. The floor eggs and survival rate of the birds were affected by the timing of the first access to range area (P<0.05). The age at first access to range area had no significant effect on all egg quality traits investigated. The laying period had significant effect on all egg quality parameters (P<0.001). There was no significant age at first access to range area x laying period interaction for all egg quality parameters.
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    Effects of egg weight on chick and organ development, growth and slaughter traits in pekin ducks
    (Uludağ Üniversitesi, 2017-08-11) Sözcü, Arda; Ipek, Aydın; Veteriner Fakültesi
    This study was carried out to determine the effects of increased egg weight of pekin ducks on organ development, chick quality, growth traits, slaughter and carcass yield. A total of 405 one day old Pekin ducklings that have been hatched from light, medium and heavy hatching eggs, were used in the experiment. Egg weight were classified as “light” (<75 g), “medium” (76-82 g) and “heavy” (>83 g) by weighing with ±0.1 precision one by one. The chick hatching weight and leg length were found to be the highest in chicks hatched from heavy eggs, with values of 47.4 g and 227.8 mm compared to the chicks hatched from light and medium eggs (P<0.05). At 42 d of age, the body weight of ducks hatched from heavy eggs was 3195.0 g, compared to the ducks hatched from light and medium eggs (2879.6 and 2897.9 g, P=0.001). Any significant differences observed for feed conversion rate and mortality among the experimental groups (P>0.05). Slaughter weight, carcass weight were also the highest for ducks hatched from heavy eggs (P=0.004). In conclusion, increased egg weight affected chick hatching weight and growing performance in Pekin ducks.