Effects of the periparturient period and feed restriction on metabolism, inflammation, and gastrointestinal tract permeability in dairy cows

dc.contributor.advisor Baumgard, Lance H
dc.contributor.advisor Gorden, Patrick J
dc.contributor.advisor Appuhamy Jayasooriya, Ranga
dc.contributor.advisor Carpenter, Abigail J
dc.contributor.advisor Mahanna, Bill
dc.contributor.author Goetz, Brady
dc.contributor.department Animal Science en_US
dc.date.accessioned 2023-06-20T22:18:26Z
dc.date.available 2023-06-20T22:18:26Z
dc.date.issued 2023-05
dc.date.updated 2023-06-20T22:18:26Z
dc.description.abstract The partitioning of nutrients towards productive processes (i.e., milk synthesis, reproduction, growth, etc.) is essential for economically profitable and sustainable agriculture. Dairy cows encounter a multitude of physiological, psychological, nutritional, and environmental challenges that often result in immune activation and its accompanied inflammatory response. An activated immune system is energetically expensive and is frequently coupled with hypophagia, both of which reprioritize nutrients towards the immune system at the expense of productive processes. There are a several potential epithelia sources of inflammation in dairy cows including the mammary gland, uterus, lungs, and gastrointestinal tract (GIT). Additionally, dairy cows are subject to several stress insults (i.e., feed restriction, heat stress, shipping, etc.) which can compromise GIT barrier function. The sheer size of the ruminant alimentary canal and extensive exposure to microbial toxins in the pre-gastric fermentation compartments and the large intestine makes dairy cows especially vulnerable to inflammation stemming from intestinal hyperpermeability. Despite focused attention on nutrition and management programs aimed at reducing environmental and enteric pathogen load and ultimately immune activation, suboptimal farm animal performance remains a hurdle to profitable farming. Ergo, identifying nutritional strategies with the potential to alleviate the negative consequences of immune activation on production and metabolism are of growing interest. As part of this dissertation, supplementation of cashew nut shell extract and Bacillus subtilis PB6 were evaluated during the transition period. Additionally, a Bacillus-based direct-fed microbial (DFM) was accessed during and following feed restriction in mid-lactation cows and feeding a multispecies DFM was evaluated during feed restriction in growing heifers. Furthermore, the development, validation, and understanding of biomarkers of GIT health and permeability are imperative to understanding the events that influence GIT barrier dysfunction. The use of the noninvasive permeability marker chromium (Cr)-EDTA and inflammatory biomarkers were utilized in conjunction to provide information on GIT barrier effectiveness and assist in predicting intestinal responses during the transition period and feed restriction. In summary, intestinal barrier dysfunction remains an important issue threatening feed efficiency, milk production, welfare, and farm sustainability. The nutritional strategies evaluated in this dissertation provide novel insight into how the dairy industry can implement approaches to improve animal health, increase animal productivity, and improve farm profit.
dc.format.mimetype PDF
dc.identifier.orcid 0000-0003-4315-212X
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/erLKldov
dc.language.iso en
dc.language.rfc3066 en
dc.subject.disciplines Animal sciences en_US
dc.subject.disciplines Nutrition en_US
dc.subject.disciplines Physiology en_US
dc.subject.keywords Bacillus en_US
dc.subject.keywords Cr-EDTA en_US
dc.subject.keywords leaky gut en_US
dc.subject.keywords transition period en_US
dc.title Effects of the periparturient period and feed restriction on metabolism, inflammation, and gastrointestinal tract permeability in dairy cows
dc.type article en_US
dc.type.genre dissertation en_US
dspace.entity.type Publication
thesis.degree.discipline Animal sciences en_US
thesis.degree.discipline Nutrition en_US
thesis.degree.discipline Physiology en_US
thesis.degree.grantor Iowa State University en_US
thesis.degree.level dissertation $
thesis.degree.name Doctor of Philosophy en_US
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