Effects of Adding Different Levels of Boiled Flaxseed to Diet on Growth Performance,Egg Quality,Fatty Acid Deposition in Yolk and Serum Biochemical Indexes of Laying Hens
This experiment was conducted to investigate the effects of dietary different levels of boiled flaxseed on growth performance,egg quality,yolk fatty acid enrichment and serum biochemical indexes of marine blue brown laying hens.A single-factor experimental design was used to select 1 620 Hyline brown laying hens with similar body weight[(2.05±0.06)kg]and laying rate[(72.4±0.5)％]at late laying period were randomly divided into 6 groups with 6 replicates per group and 45 hens per replicate.The control group was fed a basal diet,the untreated group was fed a basal diet supplemented with 4％untreated flaxseed,and the trial groupsⅠ,Ⅱ,Ⅲ and Ⅳ were fed a basal diet supplemented with 4％,8％,12％and 16％boiled flaxseed,respec-tively.The pre-test period was 1 week,and the experimental period was 5 weeks.The results showed as fol-lows:1)under the same dietary flaxseed supplemental level,the laying rate of untreated group was significant-ly lower than that of trial group Ⅰ(P＜0.05),and the laying rate of trial groups Ⅰ,Ⅱ,Ⅲ and control group was significantly higher than that of trial group Ⅳ(P＜0.05),and the highest was in trial group Ⅱ.Compared with the control group,the average egg weight of trial groups Ⅱ,Ⅲ and Ⅳ was significantly increased(P＜0.05).Compared with trial group Ⅰ,the egg to feed ratio of trial groups Ⅱ,Ⅲ and Ⅳ was significantly de-creased(P＜0.05).2)Different levels of boiled flaxseed had no significant effects on egg shape index,egg white ratio and yolk ratio(P＞0.05).Compared with the control group,the Haugh unit of trial group Ⅱ was significantly increased(P＜0.05),no significant effect was found in trial groups Ⅰ and Ⅲ(P＞0.05),and the Haugh unit of trial group Ⅳ was significantly decreased(P＜0.05).Compared with the control group,the eggshell strength of trial groups Ⅰ,Ⅱ and Ⅲ was also significantly increased(P＜0.05),and there was no significant effect in group Ⅳ(P＞0.05),and the eggshell strength of trial group Ⅰ was significantly higher than that of the untreated group(P＜0.05).3)Compared with the control group,the yolk of trial groups Ⅰ,Ⅱ,Ⅲ and Ⅳ exhibited a significant increase in ω-3 polyunsaturated fatty acid(PUFA)content(P＜0.05),while the ω-6/ω-3 PUFA ratio significantly decreased(P＜0.05).Among all groups,trial group Ⅱ had the highest docosahexaenoic acid(DHA)content and the lowest ω-6/ω-3 PUFA ratio.Additionally,compared with the untreated group,trial group Ⅰ showed a significant increase in DHA and ω-3 PUFA contents with a simultaneous decrease in ω-6/ω-3 PUFA ratio(P＜0.05).4)Compared with the control group,adding differ-ent levels of boiled flaxseed into diets resulted in a significant decrease in total cholesterol(TC),triglyceride(TG),high-density lipoprotein(HDL),low-density lipoprotein(LDL)contents,as well as aspartate amin-otransferase(AST)activity in serum of laying hens(P＜0.05).Trial group Ⅱ had the lowest TC,TG,LDL contents along with AST and alanine aminotransferase(ALT)activities;however,TG content in trial groupⅣ significantly increased(P＜0.05),serum AST and ALT activities were significantly higher than those of tri-al groups Ⅱ and Ⅲ(P＜0.05).Furthermore,the serum TC and TG contents along with AST and ALT activi-ties were significantly lower in trial group Ⅰ compared with those of untreated group(P＜0.05).5)The ω-3 PUFA deposition efficiency and the ω-3 PUFA and DHA deposition amount per egg of the untreated group were significantly lower than those of other groups(P＜0.05).In this study,under the conditions of this exper-iment,the optimal addition amount of boiled flaxseed in the diet is 6.2％to 11.0％,which can effectively en-rich ω-3 PUFA such as DHA and ALA in egg yolk.It has no adverse effect on egg quality,and can improve the growth performance,blood lipid indexes and liver function of laying hens(55-weeks-old)in late laying period.[Chinese Journal of Animal Nutrition,2024,36(4):2370-2382]
万方数据
维普
