The heat increment in fasting sheep of acetic acid partially neutralized with sodium hydroxide

Armstrong, David G.; Blaxter, K. L.; Graham, N. McC.

doi:10.1079/bjn19610021

Cited by 14 publications

(8 citation statements)

References 5 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, Masson and Phillipson (1951) demonstrated conclusively that absorption could occur from rumen contents at a pH greater than 7.0. More limited results by and Armstrong et al (1961) supported the contention of Danlelll .et al ( 1945) that absorption is reduced as the pH rises. Changes in the rumen concentrations of the individual VFA measured by Masson and Phillipson (1951) suggested that specific absorption rates were In the order butyrate > propionate > acetate.…”

Section: Structure Of the Rumensupporting

confidence: 72%

“…Changes in the rumen concentrations of the individual VFA measured by Masson and Phillipson (1951) suggested that specific absorption rates were In the order butyrate > propionate > acetate. Danlelll et al (1945) had concluded that the order of absorption at alkaline pH was the reverse of this; measurements of blood changes by Masson and Phillipson (1951) and of rumen changes by Pfander and Phillipson (1953) and Armstrong et al (1957) tended to support this belief.…”

Section: Structure Of the Rumenmentioning

confidence: 65%

“…A similar effect was noted by Ash and Dobson (1961, p. 73). Starvation, which probably affects the rumen in a similar manner though to a lesser degree than replace ment of thé contents with saline, also causes a reduced absorption rate (Armstrong _et al, 1957;Pfander and Phillipson, 1953).…”

Section: Discussionmentioning

confidence: 99%

“…They proposed that this demonstrated the need for an actively metabolizing epithelium to facilitate absorption since Pen nington (1952) had shown that butyrate and propionate, but lit tle acetate, were metabolized by rumen epithelium. However, the slower absorption of acetate alone might also be related to the very high levels of VFA with accompanying acidosis in the peripheral blood reported by Armstrong et al (1957).…”

Section: Structure Of the Rumenmentioning

confidence: 99%

“…Absorption Is slower from the rumen of a fasting than a feeding sheep (Pfander and Phillipson, 1953). Armstrong et al (1957) found that the the addition to the rumen of butyrate and propionate, but not acetate, increased the absorption rate in such conditions. They proposed that this demonstrated the need for an actively metabolizing epithelium to facilitate absorption since Pen nington (1952) had shown that butyrate and propionate, but lit tle acetate, were metabolized by rumen epithelium.…”

Section: Structure Of the Rumenmentioning

confidence: 99%

See 4 more Smart Citations

Functional development of epithelial tissue of the reticulo-rumen in calves

Sutton

View full text Add to dashboard Cite

Section: Structure Of the Rumensupporting

confidence: 72%

Section: Structure Of the Rumenmentioning

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Section: Structure Of the Rumenmentioning

confidence: 99%

Section: Structure Of the Rumenmentioning

confidence: 99%

See 3 more Smart Citations

Functional development of epithelial tissue of the reticulo-rumen in calves

Sutton

View full text Add to dashboard Cite

Energy metabolism in potoroine marsupials

Wallis

Farrell

1992

J Comp Physiol B

View full text Add to dashboard Cite

Fasting and fed metabolic rates were measured in three species of potoroine marsupials, the rufous rat-kangaroo (Aepyprymnus rufescens), the long-nosed potoroo (Potorous tridactylus) and the brush-tailed bettong (Bettongia penicillata). There were no significant differences among potoroine species in fasting metabolic rate. The lowest fasting heat production for each species was 11-20% less than the interspecific value of 295 kJ.kg-0.75.day-1 for basal metabolism of mature, non-reproductive eutherian homeotherms. The respiratory quotient of all species was reduced significantly as starvation proceeded, but only for B. penicillata was there a significant effect of starvation duration on fasting heat production. The night-time activity of P. tridactylus and B. penicillata doubled their daytime fasting heat production; the corresponding increase for A. rufescens was only 25%. The calorimetric measurement of fed animals showed no differences in digestible energy or metabolisable energy between species. Nevertheless, P. tridactylus and B. penicillata produced more heat per unit metabolic body mass. The maintenance energy requirements (kJ.kg-0.75.day-1) were 479, 494 and 345 for P. tridactylus, B. penicillata and A. rufescens, respectively. The net availability of metabolisable energy was about 0.70 in the three species. The combined heat production of fed female A. rufescens and their pouch young stayed relatively constant for the first two-thirds of pouch life, after which it rose sharply (20%) in response to the rapid growth of the young. Only during the last week of pouch life did the female enter negative energy balance. There was no indication that the metabolism of the female increased in response to the presence of a pouch young. The presence of pouch young did not alter the efficiency of utilisation of metabolisable energy. The daily energy requirement for maintenance was 0.83 MJ.day-1 or 0.36 MJ.kg-0.75.day-1.

show abstract

Some factors which influence thermal energy losses during the metabolism of ruminants

MacRae¹,

Lobley²

1982

Livestock Production Science

View full text Add to dashboard Cite

The heat increment in fasting sheep of acetic acid partially neutralized with sodium hydroxide

Cited by 14 publications

References 5 publications

Functional development of epithelial tissue of the reticulo-rumen in calves

Functional development of epithelial tissue of the reticulo-rumen in calves

Energy metabolism in potoroine marsupials

Some factors which influence thermal energy losses during the metabolism of ruminants

Contact Info

Product

Resources

About