| The purpose of our trial was to research the effects of inulin on the digestive tracts of roosters, for the theoretical basis of inulin as a feed additive. Thirty 40-week-old Hy-line Brown parental roosters were randomly divided into 5 groups and each group had 6 birds. The trial groups(group A,B,C and D) were fed basic diet with the substitution of 0.5%, 1.0%, 1.5% and 2.0% inulin for equivalent maize, respectively. The control group (group E) was fed the basic diet. In the test period, every five days we collected feces andâ… ,â…¡,â…¢,â…£andâ…¤mean the five samples respectively. After the twenty-five test period days, we slaughtered the experiment animals and sampled. The results were as follows:1. In the groupâ…¡, group D had a significant high level compared with the control group(P<0.05). Group A,B and C had no difference compared with the control group(P>0.05). In the groupâ… ,â…¢,â…£,â…¤, the different concentration inulin had no effect on the fecal moisture(P>0.05). The results showed inulin had no effects on the fecal moisture.Compared with the control group, the group B enhanced extremely significantly the moisture of ingluvies conten(tP<0.01) and the group C increased the moisture of ingluvies content(P<0.05). The other trial groups had no difference with the control group in the moisture of ingluvies content(P>0.05). The group B had significant higher moisture of gizzard content than the control group(P<0.05), and the other trial groups had no difference with the control group in the moisture of gizzard content(P>0.05). Inulin had no effects on the moisture of jejunum, duodenum and cecum contents(P>0.05).2. The trial groups had no effect on ingluvies pH value(P>0.05). Therefore inulin had no effect on the ingluvies pH value.Group A, B and D had a significant low level on the cecum pH value(P<0.05). Groups C had a extremely significant low effect on cecum pH value compared with the control group(P<0.01), not a significant level compared with groups A, B and D(P>0.05). The results suggested inulin could decline the cecum pH value. But the additive amount of inulin had little effect on cecum pH value. In the groupâ… ,â…¡andâ…£, inulin had no effect on the fecal pH value(P>0.05). In the group, the group D had a extremely significant low level on pH value compared with the control group(P<0.01). Compared with the control group, the other trial groups had no effect(P>0.05). Therefore inulin had no effect on fecal pH value.3. Compared to the control group, The group D increased extremely significantly the content of propionic acid(P<0.01) , and increased significantly of acetic acid(P<0.05) . The other trial groups also increased the content of acetic acid, propionic acid and butyric acid, but not achieved the significant level(P>0.05). The results showed inulin was degraded in the ingluvies and produced the volatile fatty acid. Inulin declined the ratio of acetic acid of ingluvies, but increased the ratio of propionic acid and butyric acid of ingluvies compared with the control group in the trial groups (except the group C). The results showed inulin degraded in the ingluvies could decline the ratio of acetic acid, increase the ratio of propionic acid and butyric acid.Compared with the control group, group D increased significantly the content of butyric acid of cecum(P<0.05). The other experimental groups all had no effect on the content of acetic acid, propionic acid, butyric acid and isobutyric acid(P>0.05). Inulin had no effect on the grosses of volatile fatty acid(P>0.05). Inulin declined the ratio of acetic acid and propionic acid of cecum and increased the ratio of butyric, but had no regularity on the ratio of isobutyric acid. The results showed inulin degraded in the cecum could increase the ratio of butyric acid, especially the dose of 2.0% inulin.4. The apparent digestibility of dry matter in the duodenum, jejunum and cecum showed an increasing trend for using inulin.5. In the groupâ… ,â…¡,â…¢,â…£andâ…¤, compared with the control group, the group C had a extremely significant high effect on the apparent protein digestibility(P<0.01). The other trial groups also increased the apparent protein digestibility, but not equal to the group C.In summary, inulin can decline the pH value of the cecum, increase the protein-use ratio for the roosters. Inulin also can influence the ingluvies and cecum the gross and ratio of volatile fatty acid. Therefore inulin can serve as a feed additive. |
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