ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (7): 1396-1404.doi: 10.11843/j.issn.0366-6964.2016.07.012

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Studies on Dietary Lysine Requirement of Jinghong Laying Hens from Hatch to the Age of 4 Weeks

WU Shu-geng#，WANG Xiao-cui#，SONG Dan，ZHANG Hai-jun，YUE Hong-yuan，WANG Jing，QI Guang-hai*   

  1. (National Engineering Research Center of Biological Feed，Key Laboratory of Feed Biotechnology of Ministry of Agriculture，Feed Research Institute，Chinese Academy of Agricultural Sciences，Beijing 100081，China)
  • Received:2015-09-08 Online:2016-07-23 Published:2016-07-23

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Abstract:

The study was conducted to investigate the effect of dietary lysine (Lys) levels on growth performance and organ development of Jinghong laying hens，and to estimate the optimal dietary lysine requirement of Jinghong laying hens aged from hatch to the age of 4 weeks.A total of 300 1-day-old Jinghong laying hens were randomly allotted to 5 groups with 5 replicates per group and 12 hens per replicates.Lys was added to the basal diet to obtain the Lys level at 1.00%，1.10%，1.20%，1.30% and 1.40%，respectively.The trial lasted 4 weeks.The results showed as follows：The average daily gain in the 1.20% Lys group was significantly higher than that in 1.00%，1.30% and 1.40% Lys groups（P<0.05）；The body weight at 4 weeks in the 1.20% Lys group was significantly higher than that in 1.00%，1.30% and 1.40% Lys groups (P<0.05).The pancreas weight in the 1.20% Lys group was significantly higher than that in the other groups (P<0.05).The jejunum index in the 1.20% Lys group was significantly lower than that in the 1.00% Lys group，and the jejunum relative length in the 1.20% Lys group was significantly higher than that in the other groups (P<0.05).The ileum index in 1.20% and 1.30% Lys groups were significantly lower than that in 1.00%，1.10% and 1.40% Lys groups (P<0.05)，while the ileum relative length in 1.2% Lys group was significantly higher than that in 1.00%，1.10% and 1.40% Lys groups (P<0.05).The body weight，carcass weight and eviscerated carcass weight in the 1.20% Lys group at the age of 4 weeks were significantly higher than that in the other groups(P<0.05)。Birds fed 1.20% Lys had significantly higher heart weight，lung weight than that in the other Lys groups.The kidney weight in the 1.20% Lys group was significantly higher than that in 1.00%，1.30% and 1.40% Lys groups (P<0.05).Liver weight in 1.10%，1.20% and 1.30% Lys groups were significantly higher than that in the other groups (P<0.05)，and the shinbone length were significantly higher than that in 1.00% Lys group (P<0.05).Birds fed 1.10% and 1.20% Lys had significantly higher chest width than that in the other Lys groups (P<0.05).The spleen index（0.290%） and bursa of fabricius index（0.543%） in the 1.30% Lys group were significantly higher than that in the 1.00% Lys group(P<0.05).Hens fed 1.10% and 1.20% Lys had significantly lower serum uric acid content than that in 1.00% and 1.40% Lys groups(P<0.05).According to the quadratic regression analysis based on community evenness，body weight，average daily gain，carcass weight，heart weight，liver weight，ileum index，ileum relative length and uric acid content，the optimal dietary levels of Lys for Jinghong laying hens were 1.145%，1.158%，1.155%，1.154%，1.151%，1.155%，1.189%，1.204% and 1.142%，respectively.The optimal averaged Lys levels was 1.161%.These results indicate that addition of appropriate Lys level in diet can promote growth performance and organ development.The optimal Lys level in diet of Jinghong laying hens from hatch to the age of 4 weeks is 1.16%.

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