Absorption of steam volatile fatty acids from the reticulo-rumen of anaesthetised calves

Khouri, R.H.

doi:10.1080/00288233.1969.10421183

Cited by 4 publications

(7 citation statements)

References 25 publications

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“…These findings confirm previous observations (Khouri 1969) and strongly suggest that calves are born with an ability both to absorb and to utilise VF A. This ability is not unexpected when it is remembered that the acids are transported across the rumen wall by passive rather than by active processes (Annison 1965) and that acetate plays a vital role in the metabolism of all living organisms.…”

Section: Discussionsupporting

confidence: 79%

“…Steam volatile fatty acid (VFA) assimilation was demonstrated in calves 3 to 5 days old by changes in the veno-arterial concentration difference of the rumen after the introduction of a buffered solution of the acids into the fasted, emptied, and rinsed-out forestomach (Khouri 1969). Rapid removal of absorbed VFA from the peripheral circulation suggested that the animals were also capable of metabolising the acids.…”

Section: Introduction 293mentioning

confidence: 99%

“…Half a litre of a warmed (37°c) and buffered 0.15 M solution of YF A (Khouri 1969), containing I50p. curies of acetate-loCH (Radiochemical Centre, Amersham, England) as a marker was introduced into the rumen.…”

Section: Surrical Preparation and Experimental Proceduresmentioning

confidence: 99%

“…Calves were prepared by the surgical procedure described in the previous study (Khouri 1969). From then on the experiments' progressed as follows:…”

Section: Surrical Preparation and Experimental Proceduresmentioning

confidence: 99%

“…Blood flow rates through the right ruminal vein catheter were measured 0, 10, 20, 30, 40, 50, and 60 minutes after the YFA were introduced into the rumen (Khouri 1969).…”

Section: Surrical Preparation and Experimental Proceduresmentioning

confidence: 99%

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Absorption of acetate-1-C14 from the reticulo-rumen of Calves 3 to 4 days old

Khouri¹

1969

New Zealand Journal of Agricultural Research

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The ability of calves to absorb and metabolise steam volatile fatty acids (VFA) was investigated by the introduction of acetate-loCH into the rumen of three anaesthetised animals 3 to 4 days old. Acetate-l-C14 appearance in rumen effluent blood and clearance from peripheral blood were considered sufficient evidence of assimilation and utilisation respectively. All the calves absorbed and rapidly metabolised the isotope.

show abstract

Section: Discussionsupporting

confidence: 79%

Section: Introduction 293mentioning

confidence: 99%

Section: Surrical Preparation and Experimental Proceduresmentioning

confidence: 99%

“…Calves were prepared by the surgical procedure described in the previous study (Khouri 1969). From then on the experiments' progressed as follows:…”

Section: Surrical Preparation and Experimental Proceduresmentioning

confidence: 99%

“…Blood flow rates through the right ruminal vein catheter were measured 0, 10, 20, 30, 40, 50, and 60 minutes after the YFA were introduced into the rumen (Khouri 1969).…”

Section: Surrical Preparation and Experimental Proceduresmentioning

confidence: 99%

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Absorption of acetate-1-C14 from the reticulo-rumen of Calves 3 to 4 days old

Khouri¹

1969

New Zealand Journal of Agricultural Research

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Digestive adaptation in the preruminant

Thivend¹,

Toullec²,

Guilloteau³

1980

Digestive Physiology and Metabolism in Ruminants

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Technical note: Infusion, sampling, and vacuum-assisted collection devices for use in ruminally cannulated calves

Yohe

Schramm

Parsons

et al. 2018

Journal of Dairy Science

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Calves can be ruminally cannulated at young ages, but equipment size limitations preclude use of an infusion and sampling device in these small animals. Likewise, a procedure to easily evacuate rumen contents in young calves has not been described. Overcoming these technical complications related to assessment of ruminal passage kinetics, nutrient digestion, and volatile fatty acid absorption would aid in future studies advancing our knowledge of dairy calf nutrition. The first objective was to design and fabricate 2 devices (one device for infusion and sampling, and another for vacuum-assisted collection) suitable for use in young ruminally cannulated dairy calves. The second objective was to test the utility of these tools when performing procedures commonly used in ruminant nutrition research. A single weaned 62-d-old ruminally cannulated calf was used to evaluate the ability to infuse a solution of LiCoEDTA and sample rumen contents through the cannula cap over a period of 2 h to assess the rumen liquid passage rate (procedure 1). The device was capable of infusing the LiCoEDTA and sampling the rumen fluid, as evidenced by the presence of elevated Co concentrations in the sampled rumen fluid. Using the fluid samples obtained, liquid passage rate within the calf was estimated to be 40.2% of ruminal fluid/h. The second procedure tested the vacuum-assisted collection device and consisted of evacuating and weighing the rumen contents, which is considered a key preparatory step in washed reticulorumen technique experiments that aim to measure nutrient absorption. In agreement with existing literature, evacuated rumen contents represented approximately 4% of the calf's body weight. In conclusion, custom-built devices for infusion, sampling, and vacuum-assisted collection were efficacious when tested in a 62-d-old ruminally cannulated calf fed a diet of 100% texturized starter (18% crude protein, as-fed). Fellow scientists may employ and further modify these techniques to suit their needs when assessing passage kinetics, nutrient digestion, and volatile fatty acid absorption in calves.

show abstract

Absorption of steam volatile fatty acids from the reticulo-rumen of anaesthetised calves

Cited by 4 publications

References 25 publications

Absorption of acetate-1-C14 from the reticulo-rumen of Calves 3 to 4 days old

Absorption of acetate-1-C14 from the reticulo-rumen of Calves 3 to 4 days old

Digestive adaptation in the preruminant

Technical note: Infusion, sampling, and vacuum-assisted collection devices for use in ruminally cannulated calves

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