Yazar "Aksoy, T" seçeneğine göre listele

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    The effect of oviposition time on egg quality and the possibility of estimating egg shell weight using a formula in commercial layers
    (Scientific Technical Research Council Turkey, 2001) Aksoy, T; Yilmaz, M; Tuna, YT
    The purposes of this study were to determine the effects of oviposition time on egg quality and to examine the possibility of estimating egg shell weight using a formula. The interactions in some egg quality measurements were also studied. During the experiment. 80 white and 64 brown layers were housed in cages and fed with a standard layer ration. The birds were given 17 hours of light per day throughout the experiment. Egg quality was checked four times with two week intervals. At each check, eggs were collected at 09.(oo), 12.(oo) and 15.(oo), on consecutive days. Egg weight (EW), egg specific gravity (ESG) and shell weight (SW) were measured, and then shell ration (SR) and shell weight per unit surface area (SWUSA) were calculated. In addition, the SW was estimated by two formulae using EW and ESG. The data from white and brown layers were analysed separately. The effects of oviposition time and age of hens were tested with variance analysis. The correlation coefficients between quality measurements were determined. The effect of age was not significant (p>0.05). Collection time had a significant (p<0.05) effect on the EW of white and brown layers. For the two groups, the heaviest EWs were determined at the first collection time, and the lightest EWs at the last time. Although the measured SW was not affected by the collection time, it was highest at the first collection. Significant correlations were detected between measured and calculated SW (r between .6612 and .8521, p<0.01 overall). The ESG was more closely correlated with SR and SWUSA than with SW. In addition, negative correlations were found between EW and ESG as well as with SR.
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    A research on egg qualities of early age force molted commercial layer
    (Scientific Technical Research Council Turkey, 1997) Aksoy, T; Duvencioglu, H; Altenler, S; Savas, T
    The primary aim of this research is to investigate egg qualities of a commercial layer which was force molted as a result of depressed egg prices. Variations in some egg-shell quality measurements related to age and their interactions were also searched. During the experiment, 1640 white laying hens were housed in three-tier cages and fed with a standard layer ration throughout the laying period. Forced molting based on feed and light restrictions was induced on the 38 th week. Egg yield was recorded daily throuhout the experiment. Egg weight, specific gravity, form index, shell weight and shell thickness were measured with two week intervals on a random sample of 80 eggs which was selected 6 times during the molting and 12 times during the post molting. Egg yield in the second laying period following the forced molting was found to be above the common standards of the hybrids used. Egg weight and egg shell weight showed significant (P<0.01) increases in the post molting period. Molting did not result in any prominent increase in egg shell thickness but overall improvement going on for 3 months was observed in specific gravity. Also, the proportion of normal shaped eggs increased relative to long and round ones after molting. High and significant correlations were detected between egg weight and shell weight (r=0.67, P<0.01), specific gravity and shell thickness (r=0.62, P<0.01), specific gravity and % egg shell (r=0.55, P<0.01), and shell thickness and % egg (r=0.53, P<0.01). While egg weight and shell weight increased with age, shell thickness and specific gravity decreased. The effect of age was found to be significant (P<0.01) on ail these measurements.