Read e-book online Applied Dairy Microbiology, PDF

By Elmer H. Marth, James Steele

ISBN-10: 0585404119

ISBN-13: 9780585404110

ISBN-10: 082470536X

ISBN-13: 9780824705367

This completely revised and up to date reference offers entire assurance of the newest advancements and clinical advances in dairy microbiology—emphasizing probiotics, fermented dairy items, illness prevention, and public future health and regulatory keep an eye on criteria for dairy meals.

Containing greater than 2350 bibliographic citations, tables, drawings and photographs—550 greater than the former edition—Applied Dairy Microbiology, moment version is a useful reference for all nutrients and dairy microbiologists, scientists, and technologists; toxicologists; foodstuff processors; sanitarians; dietitians; epidemiologists; bacteriologists; public future health and regulatory team of workers; and veterinarians; and an incredible textual content for upper-level undergraduate, graduate, and continuing-education scholars in those disciplines.

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Example text

Fungal populations are highest in animals fed diets high in fibrous stem materials; perhaps because of the latter’s long ruminal retention time that coincides with the slow growth rate of the fungi. D. Microbial Fermentations in the Rumen 1. Structural Carbohydrates Plant cell walls (the fibrous component of most forages) are composed primarily of cellulose, hemicellulose, pectin, and lignin. These polymers are differentially localized into the different layers of the cell wall (Fig. 6). The architecture of the plant cell wall varies greatly with cell type (Harris, 1990).

Major proteolytic species in the rumen are B. fibrisolvens, S. bovis, and P. ruminicola. These species also have important roles in carbohydrate fermentation. The fermentation of amino acids and peptides released from protein hydrolysis is carried out by a number of ruminal species. The most active appear to Microbiology of the Dairy Animal 29 Figure 9 Generalized scheme of protein degradation in the rumen. Both bacteria and protozoa participate in the process. α-Keto acids may be used intracellularly as anabolic intermediate compounds, or decarboxylated to VFAs, which are then exported.

Haemophilus somnus Leptospira pomona Listeria monocytogenes Many agents (See Table 9) Mycobacterium paratuberculosis Salmonella serovars Clostridium tetani in the milk. Clinical mastitis appears to cause similar reductions in yield in highand low-yielding herds (Firat, 1993). Subclinical mastitis can only be detected by laboratory methods, and is most commonly revealed by routine microscopic counts of somatic cells (Ͼ4 ϫ 105 cells/mL, usually leukocytes) in the milk (Auldist and Hubble, 1998). If mastitis is caused by infection, the causative agent can be observed and often identified at the same time.

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Applied Dairy Microbiology, by Elmer H. Marth, James Steele


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