Przeglądaj wg Autor "Zawadzki, Wojciech"

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  • Miniatura
    PozycjaOpen Access
    The Impact of the Application of Brewer's By-Product Roasted Barley Husks on Selected Parameters of Rumen Fermentation of Dairy Cows. In Vitro Study
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2019) Formella, Rachela Anna; Pecka-Kiełb, Ewa; Zawadzki, Wojciech; Adamski, Maciej; Department of Cattle Breeding and Milk Production, Institute of Animal Breeding, Wroclaw University of Environmental and Life Sciences, Poland; Department of Animal Physiology and Biostructure, Institute of Animal Physiology, Wroclaw University of Environmental and Life Sciences, Poland; Department of Animal Physiology and Biostructure, Institute of Animal Physiology, Wroclaw University of Environmental and Life Sciences, Poland; Department of Cattle Breeding and Milk Production, Institute of Animal Breeding, Wroclaw University of Environmental and Life Sciences, Poland
    The aim of the study was to evaluate the effect of brewer's by-product roasted barley husks additive (RBH) on the cow's rumen fermentation process, in in vitro conditions. Ruminal fluid for the research was collected from 9 dairy cows selected on the basis of analogues. Animals were fed total mixed ratio (TMR). The substrates for in vitro experiment were composed on the basis of TMR. Control substrate contained only TMR. Substrates D1, D2, D3 contained TMR with the addition of respectively: 5, 10 and 15% of dry matter of RBH. Substrate D4 contained only RBH. Samples of ruminal fluid were incubated for 8 hours, in anaerobic conditions, at 39°C. A desirable effect of applying RBH was observed in groups D3 and D4 – the production of volatile fatty acids (VFA) increased. Furthermore, positive effects were observed in groups D2 and D4 – acetic acid production decreased (by up to 7%). Reduced methane production (up to 10%) was observed in experimental groups which indicates that animals would have smaller energy losses. Most beneficial changes in the VFA profile and the highest growth of non-glucogenic and glucogenic acids ratio (NGR) were recorded in D3 group samples. Positive results in this matter are promising as the roasted barley husks are a by-product of beer production and its usage has both economic and ecologic benefits. Obtained results in the in vitro study are the prerequisites to carry out an in vivo experiment.
  • Miniatura
    PozycjaOpen Access
    The Potential of Using Corn Dried Distillers Grains with Solubles (DDGS) in Order to Improve the Fermentation Profile in Sheep
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2015) Wysocka, Olga; Pecka, Ewa; Zawadzki, Wojciech; Department of Animal Physiology and Biostructure, Wrocław University of Environmental and Life Sciences, Poland; Department of Animal Physiology and Biostructure, Wrocław University of Environmental and Life Sciences, Poland; Department of Animal Physiology and Biostructure, Wrocław University of Environmental and Life Sciences, Poland
    The global increase in food demand and rising costs of production forces the agricultural industry to search for cheaper and more efficient methods of food provision. A partial solution to this problem could be the use of a high-protein feed of an industrial origin in livestock nutrition, such as corn dried distillers grains with solubles (DDGS). Since DDGS is a byproduct, arising as a result of bioethanol production from corn, including it to ratio could be an excellent way of its natural utilization. There are indications that DDGS may favorably affect the rumen fermentation profile, inter alia, by increasing the total production of volatile fatty acids and changing the ratio between some of acids. Other reports relate to the reduction of greenhouse gases emitted by ruminants. Regarding the high calorific value of methane, the reduction of methanogenesis is an extremely beneficial phenomenon for grazers, because it allows to reduce energy losses associated with emission of fermentation gases. Due to the large heat capacity, it is believed that methane has a great influence on global warming. Therefore, another advantage of inhibiting methane production is reduced amount of gas in the atmosphere. However, the effect exerted on the fermentation following DDGS insertion into diet is not carefully examined, particularly in relation to the sheep, and the results are often conflicting. For that reason, there is a need for further research, gathering knowledge and verify whether the use of DDGS in the ratio of sheep is actually the convergent goal from ecological and productive point of view.