Quantitative microbial protein synthesis in the bovine rumen

Pitzen, Daniel Frederick

doi:10.31274/rtd-180816-798

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…The in vitro data, beginning with that of Pearson and Smith (1943) up to the more recent work of Wohlt et al (1973), were reviewed with respect to protein solubility and feedstuffs. The in vivo data of Pitzen (1974), and others using abomasal cannulated animals and analyses of digesta postruminally were used to some extent in estimating feedstuff protein degradation. Also, feeding trials with young growing cattle making use of the MP system were utilized in further appraising protein degradation.…”

Section: Coefficient Values In Establishing Mp Maa and Ufp Values Fomentioning

confidence: 99%

“…The rumen-degraded protein that was resynthesized into microbial protein and which entered the abomasum was limited to 1.04 times the grams of TDN in 100 g of feed DM based upon postruminal digesta analyses (Hogan and Weston, 1967, 1969, 1971Hume and Bird, 1970;Ibrahim and Ingalls, 1972;Lindsay and Hogan, 1972;Pitzen, 1974). The estimate from these data with semi-purified and natural diets was that about 52% of the TDN (fermentable energy) was chemically altered or microbially digested in the rumen.…”

Section: Coefficient Values In Establishing Mp Maa and Ufp Values Fomentioning

confidence: 99%

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Protein Physiology and Its Application in the Lactating Cow: The Metabolizable Protein Feeding Standard

Burroughs

Nelson

Mertens

1975

Journal of Animal Science

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The metabolizable protein (MP) feeding standard for lactating cows represents a balance between animal requirements for metabolizable amino acids (MAAs) and their fulfillment by diets composed of a wide variety of feedstuffs. One additional measurement for feedstuffs, the .urea-fermentation-potential (UFP), is utilized when urea is a part of the diet. Although the MP standard is an amiho kei'd (AA) standard, nevertheless, an alte/'fiativd ~if~gle-value MP standard was approximated ~H~out resorting to calculations for each ess~iatlal 'AA. The net protein (NP) of body origin ifi the feces was estimated to be 12 g/kg 0~ dry matter (DM) consumed. This amount Was regarded as a feedstuff expense of digestion reducing the quantity of MP available for productive purposes such as lactation. The estimation of rumen microbial protein synthesis as 10.4% of total digestible nutrients (TDN) is based upon three evaluations. The first is that 52% of ration TDN undergoes digestion within the rumen. The second is that 25% of the digested TDN is transformed into microbial crude protein when adequate nitrogen is present. The third evaluation is that 80% of the microbial protein is alpha-amino. The 80% true digestibility value for abomasal microbial protein synthesized within the rumen is based upon cattle and sheep metabolism trials. Semi-purified diets 1

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Section: Coefficient Values In Establishing Mp Maa and Ufp Values Fomentioning

confidence: 99%

Section: Coefficient Values In Establishing Mp Maa and Ufp Values Fomentioning

confidence: 99%

Protein Physiology and Its Application in the Lactating Cow: The Metabolizable Protein Feeding Standard

Burroughs

Nelson

Mertens

1975

Journal of Animal Science

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Microbial Ecology and Activities in the Rumen: Part I

Hobson¹,

Wallace²,

Bryant

1982

CRC Critical Reviews in Microbiology

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This review describes the progress which has been made during the last 10 to 15 years in the field of rumen microbiology. It is basically an account of new discoveries in the bacteriology, protozoology, biochemistry, and ecology of the rumen microbial population. As such it covers a wide range of subjects including the isolation and properties of methanogenic bacteria, the role of rumen phycomycete fungi, anaerobic energy conservation, and general metabolic aspects of rumen microorganisms. It also attempts, however, to describe and develop new concepts in rumen microbiology. These consist principally of interactions of the microbemicrobe, microbe-food and microbe-host types, and represent the main areas of recent advance in our understanding of the rumen ecosystem. The development of experimental techniques such as chemostat culture and scanning electron microscopy are shown to have been instrumental in progress in these areas. The paper is concluded with an assessment of our present knowledge of the rumen fermentation, based on the degree of success of experiments with gnotobiotic ruminants inoculated with defined flora and in mathematical modeling of the fermentation. The efficacy of chemical manipulation of the fermentation in ruminant is also discussed in this light.

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