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 120℃ for 30 minutes) common vetch seed (ACV) and 25% roasted (at 130℃ 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.
This study was carried out to determine the effects of lovastatin supplementation on laying performance, egg quality, yolk lipid profile and some serum parameters in Lohmann LS white commercial laying hens reared in poultry houses of Food and Livestock Application and Research Center of Ataturk University. In this experiment, Lohmann layers (n=48, 46 wks of age) were randomly divided into two groups such as control (C) fed with basal diet and treatment (L) group fed with diet including 0,0059 % of lovastatin. After one week of the adaptation period, experiment lasted for five weeks. During the experimental period, hens were fed as ad-libitum and water through nipples was available for all the times. Lovastatin supplementation increased feed consumption (FC) and feed conversion ratio (FCR). Except for yolk color, other egg quality traits were not affected by diet including 0,0059 % of lovastatin. Hens fed with treatment diet had greater triglyceride and phosphatidyl serine values than hens fed with basal diet. Differences between the groups in terms of the levels of egg yolk and serum cholesterol were not significant in present study. These differences could be attributed to short experimental period and low lovastatin added to basal diet of hens. In conclusion, further studies should be conducted to clarify the effects of lovastatin supplementation on laying performance, egg quality, yolk lipid profile and some serum parameters in laying hens fed with diets including lovastatin at different levels during long feeding period.
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