SPECIAL STORY 58 FEED & ADDITIVE MAGAZINE June 2022 The feed consumption time was prolonged up to 24 % due to the use of the insoluble crude fiber concentrate. This confirms the observations of J. Michard from Hubbard. As a consequence of the prolonged feed clean up time the flock uniformity was significantly improved. Weight control is an important issue in roosters as well. If they exceed the standard weight as defined by the genetic companies there is a negative impact on semen quality and the birds get very aggressive as well. As there are even more negative aspects of rooster overweight the weight control of roosters should be a major concern in the poultry house. The impact of insoluble fiber on the weight of roosters has been evaluated as well in the above mentioned Brazilian field trial. The results are shown in figure 1 and 2. Figure 1 shows the weight development of the roosters in the control group. Their average weight is clearly above the target weight while the birds in the trial group (0,8 % ARBOCEL) do match the target weight as given by the genetic company (Figure 2). It can be concluded from this trial that insoluble crude fiber concentrates are a good tool to control the weight of roosters. SUMMARY AND CONCLUSION Since around 10 years the use of fibers in poultry feed formulations is researched very intense. Latest research demonstrates that it is the insoluble fibers that cause a positive impact on heath and performance in poultry. Latest field and university trials have been summarized in this paper. In summary it has to be pointed out that insoluble fibers impact parameters like wet litter, cannibalism and feather pecking as well as performance positively in all poultry species due to their physicochemical characteristics. Additionally the insoluble fiber promotes satiation effects in restricted fed animals like broiler breeders. Figure 1. Weight development of roosters till week 20 in control group Figure 2. Weight development in roosters till week 20 in the trial group with 0,8 % insoluble crude fiber concentrate ARBOCEL About Dr. Manfred Pietsch Manfred Pietsch graduated in human nutrition (Dipl. oec. troph) from the Justus-Liebig University in Giessen, Germany in 1992 and received doctor’s degree at the Institute of Animal Nutrition, Justus-Liebig-University in 1996. He worked as a product and poultry application manager for several feed additive suppliers from 1996 to 2008. Pietsch has been poultry application manager and head of animal nutrition department in JRS, a supplier for insoluble functional fiber to the feed industry since 2008. In his function as poultry application manager; Dr. Pietsch published more than 20 reviewed articles on the fiber issue in poultry nutrition in specialized journals like Asian Poultry Magazine, International Poultry Production and Poultry Talk. Additionally; Dr. Pietsch is co-author of numerous original articles published in scientific journals.
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