Vitamin D2 and vitamin D3 metabolism in ruminants and by rumen microbes

Sommerfeldt, J.L.

doi:10.31274/rtd-180814-6173

Cited by 1 publication

(1 citation statement)

References 66 publications

(109 reference statements)

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“…Vitamin D is partially degraded in the rumen, conjugated with bile salts in the duodenum, and absorbed in the ileum of the small intestines (Sommerfeldt, 1982). Vitamin D 3 was toxic when large doses (15.7-17.5 × 10 6 IU) were administered parenterally about 30 d before calving (Littledike and Horst, 1982).…”

Section: Vitaminsmentioning

confidence: 99%

A 100-Year Review: Metabolic modifiers in dairy cattle nutrition

McGuffey¹

2017

Journal of Dairy Science

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The first issue of the Journal of Dairy Science in 1917 opened with the text of the speech by Raymond A. Pearson, president of the Iowa State College of Agriculture, at the dedication of the new dairy building at the University of Nebraska (J. Dairy Sci. 1:4-18, 1917). Fittingly, this was the birth of a new research facility and more importantly, the beginning of a new journal devoted to the sciences of milk production and manufacture of products from milk. Metabolic modifiers of dairy cow metabolism enhance, change, or interfere with normal metabolic processes in the ruminant digestive tract or alter postabsorption partitioning of nutrients among body tissues. Papers on metabolic modifiers became more frequent in the journal around 1950. Dairy farming changed radically between 1955 and 1965. Changes in housing and feeding moved more cows outside, and cows and heifers in all stages of lactation, including the dry period, were fed as a single group. Rations became wetter with the shift to corn silage as the major forage in many rations. Liberal grain feeding met the requirements of high-producing cows and increased production per cow but introduced new challenges; for example, managing and feeding cows as a group. These changes led to the introduction of new strategies that identified and expanded the use of metabolic modifiers. Research was directed at characterizing the new problems for the dairy cow created by group feeding. Metabolic modifiers went beyond feeding the cow and included environmental and housing factors and additives to reduce the incidence and severity of many new conditions and pathologies. New collaborations began among dairy cattle specialties that broadened our understanding of the workings of the cow. The Journal of Dairy Science then and now plays an enormously important role in dissemination of the findings of dairy scientists worldwide that address existing and new technologies.

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Section: Vitaminsmentioning

confidence: 99%

A 100-Year Review: Metabolic modifiers in dairy cattle nutrition

McGuffey¹

2017

Journal of Dairy Science

View full text Add to dashboard Cite

show abstract

Vitamin D2 and vitamin D3 metabolism in ruminants and by rumen microbes

Cited by 1 publication

References 66 publications

A 100-Year Review: Metabolic modifiers in dairy cattle nutrition

A 100-Year Review: Metabolic modifiers in dairy cattle nutrition

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