Addition of Yeast Cell Wall to Chicken Feed Enhances the Vaccinal Antibody Production

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  • 酵母細胞壁の給与が採卵鶏のワクチン抗体産生能に及ぼす影響
  • コウボ サイボウヘキ ノ キュウヨ ガ サイランケイ ノ ワクチン コウタイ サンセイノウ ニ オヨボス エイキョウ

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Abstract

A new flock consisting of 2, 100 layer chicks was divided at the age of one day into two groups at one day.One group was given a feed supplemented with 0.5% yeast cell wall (YCW) during the first two weeks, and alsoduring the periods of 21 to 27, 42 to 48, and 70 to 76 days of age respectively. The other group was given thesame feed, but without the YCW supplement. Both groups were then vaccinated. with an infectious bursal disease (IBD) live vaccine at 15 days of age; Newcastle disease (ND) and infectious bronchitis (IB) combined (NB) live vaccine at 21 and 28 days of age; and NB oil emulsion inactivated vaccine at 61 days of age. Anti-ND antibodies were monitored by a hemagglutination inhibition (HI) test, and anti-IB and anti-IBD antibodieswere monitored by Enzyme-Linked Immunosorbent Assays (ELISA). Results showed that the anti-ND antibodiestiters in the YCW-supplemented group were significantly higher (P<0.01) than those in the non-supplementedgroup, both at 42 and 117 days of age. Moreover, anti-IBD and the anti-IB antibodies titers in theYCW-supplemented group proved to be significantly higher (P<0.01) than those in the non-supplementedgroup both at 42 and 148 days of age. These results strongly suggest that the oral administration of YCW supplementsmay increase antibody production after vaccination.

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