This study was conducted to examine the effect on performance, egg quality criteria and egg cholesterol level of adding different ratios of flaxseed oil instead of sunflower oil to the compound feed of laying hens. A total of 210, 30-week old Lohmann LSL laying hens were acquired for the study. The study groups consisted of a control group (5% sunflower oil (SO) + 0% flaxseed oil (FO) and trial 1 (4% SO + 1% FO), trial 2 (3% SO + 2% FO), trial 3 (2% SO + 3% FO), trial 4 (1% SO + 4% FO) and trial 5 (0% SO + 5% FO) groups. The study lasted for 8 weeks. The feed consumption was not different among the experimental groups. Feed utilization rate was higher in group 2 compared to those of other between 0-8 weeks (P<0.001). Between weeks 0 to 8, all trial groups were found have significantly higher levels of linoleic acid, one of the fatty acids found in yolk, compared to the control group (P<0.001). Additives were not found to affects levels of cholesterol in yolk, with no significant differences found between groups. In short, sunflower oil and flaxseed oil added to laying hen rations did not create any differences in terms of egg quality criteria or egg cholesterol levels, but higher levels of flaxseed oil added to the rations resulted in linearly higher levels of linolenic acid content of yolk, and use of the two oil additives together increased egg yields.
This experiment was carried out to determine the effects of substituting protein coming from soybean-meal at different levels with protein coming from pea and enzyme addition into diets containing from pea on performance and egg quality criteria in laying hens. The experiment was carried out with 30-week-old hens. Seven treatment groups, including control group, with 7 sub-groups that contained of 7 laying hens at each groups were established. A total of 343 laying hens were utilized in the study. Egg weight was significantly lower in hens fed diet containing 10% pea (D1) protein compared with the other groups at the end of the experiment (P<0. 05). Yields of eggs per week were similar among groups, except 1. and 4.th weeks of the experiment, including last week. In general, feed intakes were also similar among groups, except 5.th week of experiment. Feed conversion ratios did not differ among groups, but were different at first week of experiment. Diameter and shape indexes among egg quality criteria were statistically similar but white indexes, Haugh unit, color scale and shell thickness were significantly different among groups (P<0.05). In conclusion, substituting protein coming from soybean meal with protein coming from pea up to 30% with or without enzyme addition had no any negative effects on performance of laying hens. Especially, egg quality indexes such as white indexes Haugh unite and egg yolk significantly improved with substation of soybean meal with pea with addition of enzyme at 20 and 30%.
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