China Animal Husbandry and Veterinary Medicine ›› 2020, Vol. 47 ›› Issue (5): 1395-1403.doi: 10.16431/j.cnki.1671-7236.2020.05.012

• Animal Nutrition and Feed Science • Previous Articles     Next Articles

Effects of Cottonseed Peptide-rich Fermented Cottonseed Meal on Growth Performance and Immune Functions in AA Broilers

LUO Yuanqin, LU Yan, NIU Junli, WEI Lianqing, HE Ganggang, ZHENG Xinxia, LU Qicheng, NIU Yujie, ZHANG Wenju   

  1. College of Animal Science and Technology, Shihezi University, Shihezi 832003, China
  • Online:2020-05-20 Published:2020-05-18

Abstract: This study was conducted to investigate the effect of cottonseed peptide-rich fermented cottonseed meal (by Bacillus subtilis-1 and Saccharomycopsis fibuligera complex bacterias) on growth performance and immune function of AA broilers.240 one-day-old female broilers were randomly allocated into 4 dietary treatments,with 4 replicates in each treatment and 15 birds per replicate.6% cottonseed meal was added in the diet of control group(CK),and 4%,6% and 8% fermented cottonseed meal rich in cottonseed peptide were added in the diets of experimental groupsⅠ,Ⅱ and Ⅲ,respectively.The experiment was divided into two stages:1 to 21 d and 22 to 42 d.The broilers were weighed and blood samples were collected at the end of each stage,and the growth performance and immune function indexes were measured.The results showed that:①Compared with CK,the ADG of group Ⅱ was extremely significantly increased at 21 d (P<0.01),and it was significantly higher than groupⅠ(P<0.05).The ADFI of group Ⅲ was significantly increased (P<0.05),and it was extremely significantly higher than groupⅡ(P<0.01) at 42 d.②Compared with CK,the thymus index of group Ⅲ was significantly increased (P<0.05),and it was significantly higher than groupⅠ(P<0.05) at 21 d.The bursa of Fabricius index of groupⅡ was extremely significantly increased at 42 d (P<0.01).③ At 21 d,the phagocytic indices of group Ⅲ was significant higher than the other treatment groups (P<0.05),the phagocytic indices of groupⅠand Ⅱ was significantly higher than CK at 42 d (P<0.05).④ At 21 d,the IL-2 and IL-1β contents of group Ⅲ was significantly higher than CK and groupⅠ(P<0.05),and the IL-6 contents of group Ⅲ was extremely significantly higher than CK (P<0.01).At 42 d,compared with CK,the IL-2 contents of all experimental groups was significantly increased (P<0.05),the IL-1β contents of group Ⅲ was extremely significantly increased (P<0.01),while the IL-6 contents of group Ⅲ was extremely significantly decreased (P<0.01).Meanwhile,the TNF-α contents of groupsⅠand Ⅲ was extremely significantly increased (P<0.01).⑤ Compared with CK,IgM and IgA contents of group Ⅲ was extremely significantly increased (P<0.01),and the IgG contents of groupⅠwas extremely significantly higher than the other treatment groups at 21 d (P<0.01).At 42 d,the IgM and IgA contents of group Ⅱ was extremely significantly increased(P<0.01).In conclusion,adding certain proportion of fermented cottonseed meal rich in cottonseed peptide could improve the growth performance and immune function in broilers.

Key words: fermented cottonseed meal; cottonseed peptide; AA broilers; growth performance; immune function

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