Effects of Normal and Extruded Flaxseed on Performance and n-3 Polyunsaturated Fatty Acid Content in Egg Yolk of Beijing You Chickens
This experiment was conducted to study the effects of high supplemental level of normal and extru-ded flaxseed and feeding time on performance and n-3 polyunsaturated fatty acid(PUFA)content in egg yolk of Beijing You chickens.A total of 300 Beijing You chickens of 30-week-old were randomly divided into 5 groups with 4 replicates per group and 15 chickens per replicate.Chickens in the control group(group A)were fed a corn-soybean meal type basal diet,and those in the experimental groups were fed the basal diets supple-mented with 10％common flaxseed(group B),15％common flaxseed(group C),10％extruded flaxseed(group D)and 15％extruded flaxseed(group E),respectively.The pre-trial period was 1 week and the trial period was 16 weeks.The results showed as follows:1)compared with the control group,dietary supplemen-tation of common flaxseed and expanded flaxseed had no significant effects on performance of Beijing You chickens during weeks 1 to 4(P＞0.05),significantly increased the average egg weight during weeks 5 to 12(P＜0.05),while significantly decreased the average daily feed intake during weeks 13 to 16(P＜0.05).With the extension of feeding time,the performance of experimental chickens showed a decreasing trend,in which the average daily feed intake and feed to egg ratio were significantly increased(P＜0.05),and the laying rate was significantly decreased(P＜0.05).2)Compared with the control group,dietary supplementation of com-mon flaxseed and extruded flaxseed had no significant effects on eggshell strength,eggshell thickness,egg-shape index and egg yolk ratio of Beijing You chicken eggs within 8 weeks(P＞0.05),but significantly de-creased the egg yolk color(P＜0.05).At week 16,compared with the control group,the eggshell strength,eggshell thickness and egg yolk redness value in experimental group were significantly decreased(P＜0.05).With the extension of feeding time,the egg quality indices of all groups showed a downward trend after 8 weeks.3)Compared with the control group,the contents of n-3 PUFA,α-linolenic acid(ALA)and docosa-hexaenoic acid(DHA)in egg yolk in experimental group were significantly increased(P＜0.05).Compared with 10％supplemental group,the contents of n-3 PUFA,ALA and eicosapentaenoic acid(EPA)in egg yolk in 15％supplemental group were significantly increased(P＜0.05).Compared with 15％common flaxseed supplemental group,the contents of n-3 PUFA and ALA in egg yolk in 15％extruded flaxseed supplemental group were significantly increased(P＜0.05).In conclusion,dietary supplementation of common flaxseed and extruded flaxseed can significantly increase the n-3 PUFA content in egg yolk of Beijing You chickens,but the supplemental levels of common flaxseed and extruded flaxseed above 10％are not suitable for long-term appli-cation in the diets for Beijing You chickens.[Chinese Journal of Animal Nutrition,2024,36(8):4971-4985]
flaxseedextruded flaxseedBeijing You chickensperformancen-3 PUFA
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维普
