The effect of raw and processed common vetch seed (Vicia sativa) added to diets of laying hens on performance, egg quality, blood parameters and liver histopathology
2013
Kaya, A. (Atatuerk University, Erzurum (Turkey). Departments of Animal Sciences) | Yoeruek, M.A. | Esenbuğa, N. | Temelli, A. | Ekinci, Oe.
Abbreviation Key: C=control diet not containing common vetch seed, CV=common vetch seed. This study was carried out to determine the effects of raw and physical processed common vetch seed added to diets of laying hens on the laying performance, egg quality traits, blood parameters and liver histopathology. Lohman layers, 46 wk of age as 6 replicate cages each containing 4 hens, were allocated randomly to one of four dietary treatments. Treatment groups were fed diets containing a standard commercial layer diet (Control), basal diet plus 25% raw common vetch seed (CV), 25% autoclaved (at 120degC for 30 minutes) common vetch seed (ACV) and 25% roasted (at 130deg for 30 minutes) common vetch seed (RCV) for 12 weeks. Considering the findings of performance traits, differences among the groups were found significant (P<0.05); however the effects of treatments were not significant on egg quality and blood parameters. The diets containing raw and different physical processed vetchs reduced feed consumption and egg production. CV compared to the control caused lipid accumulation in hepatocytes, severe congestion of hepatic blood vessels, inflammation, the increased numbers of Kupffer cells and sinusoidal dilatations. Findings from present study pointed out the risk of increased hepatic damage due to use of raw vetch seed. It is also remarkable that increasing treatments of vetch seed lead to decrease of liver damages. The results of this experiment indicated that inclusion of CV and ACV in diet affected adversely performance parameters and hepatic damage in laying hens. Alleviation was observed on laying hens fed on diet including 25% RCV. As a conclusion, it has been determined that 25% RCV is more appropriate to use in diets of laying hens than 25% CV and ACV.
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