Laura M. Cersosimo

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Ruminant livestock are important sources of human food and global greenhouse gas emissions. Feed degradation and methane formation by ruminants rely on metabolic interactions between rumen microbes and affect ruminant productivity. Rumen and camelid foregut microbial community composition was determined in 742 samples from 32 animal species and 35(More)
Although the rumen microbiome of domesticated ruminants has been evaluated, few studies have explored the rumen microbiome of wild ruminants, and no studies have identified the rumen microbiome in the impala (Aepyceros melampus melampus). In the present study, next-generation sequencing and real-time polymerase chain reaction were used to investigate the(More)
Dairy products contain bioactive fatty acids (FA) and are a unique dietary source of an emerging class of bioactive FA, branched-chain fatty acids (BCFA). The objective of this study was to compare the content and profile of bioactive FA in milk, with emphasis on BCFA, among Holstein (HO), Jersey (JE), and first generation HO x JE crossbreeds (CB) across a(More)
Rumen bacteria form a dynamic, complex, symbiotic relationship with their host, degrading forages to provide volatile fatty acids (VFA) and other substrates as energy to the animal. The objectives were to characterize rumen bacteria in three genetic lines of primiparous dairy cattle, Holstein (HO, n = 7), Jersey (JE, n = 8), and HO × JE crossbreeds (CB, n =(More)
Enteric methane from rumen methanogens is responsible for 25.9 % of total methane emissions in the United States. Rumen methanogens also contribute to decreased animal feed efficiency. For methane mitigation strategies to be successful, it is important to establish which factors influence the rumen methanogen community and rumen volatile fatty acids (VFA).(More)
In herbivores, enteric methane is a by-product from the digestion of plant biomass by mutualistic gastrointestinal tract (GIT) microbial communities. Methane is a potent greenhouse gas that is not assimilated by the host and is released into the environment where it contributes to climate change. Since enteric methane is exclusively produced by methanogenic(More)
The protozoal fatty acid (FA) composition and community structure are important to dairy cattle nutrition and their products. The purpose of the study was to observe if the rumen protozoal FA profiles and protozoal community structure differed by breed and lactation stage. At 93, 183, and 273 days in milk (DIM), whole rumen digesta samples were collected(More)
Being that the last few years have seen a greater demand for pregnancy interruption after the 1st triemster, the authors describe the methods most ofter used, while specifying their validity and the possiblity of complications. A critical analysis is offered as a conclusion. (author's modified)