Effects of Supplementary Immune Modulators (MOS, Lectin) and Organic Acid Mixture (Organic acid F, Organic acid G) on the Performance, Profile of Leukocytes and Erythrocytes, Small Intestinal Microflora and Immune Response in Laying Hens

摘要

An experiment was conducted to investigate the effects of dietary supplementation of MOS, lectin and organic acid mixture (Organic acid F, Organic acid G) on the egg production, egg quality, profile of leukocytes and erythrocytes, small intestinal microflora and immune response in laying hens. A total of 900 Hy-line Brown~(R) laying hens of 48 wks old were assigned to one of the following 6 dietary treatmentsxontrol (C), C+Avillamycin~(R) 6ppm, C+MOS 250ppm, C+1ectin 12.5ppm, C+Organic acid F (formicacid 35.4%, formate 34.6%, potassium 30.0%) 0.3% and C+0rgamie acid G(fumaric acid 23%, calcium formate 14%, potassium sorbate 5%, calcium propionate 7%) 0.06%. Each treatment was replicated five times with thirty birds per replicate, housed in 2 bird cages. Feeding trial lasted for 6 wks under 16 hours lighting regimen. All supplemental groups were higher than the control in 6 wks hen-day and hen-housed egg production showing the highest with MOS treatment (P<0.05). Soft & broken egg productions werelower in supplemental groups than in the control except lectin treatment (P<0.05). Eggyolk color of supplemental groups was higher than that of the control except Organic acid G treatment (P<0.05). The values of RBC, HB, MCHC were highest in lectin treatment and lowest in MOS treatment (P<0.05). The numbers of intestinal microflora were not significantly different among the treatments. Serum IgG levels of all supplemental groups were higher than those of the control (P<0.05). In conclusion, for supplementation of antibiotics, immune modulators and organic acid mixture improved production parameters in general. Among the supplements, MOS showed the best performance in egg production and eggyolk color.