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Transit time ultrasound measurement of portal blood flow in cattle

Published online by Cambridge University Press:  05 November 2021

ARG Wylie ,
JD McEvoy ,
P McGrattan  and
DJ Devlin
ARG Wylie
Affiliation:
Department of Agriculture for N.Ireland, Newforge Lane, Belfast BT9 5PX Queen's University of Belfast, Newforge Lane, Belfast BT9 5PX
JD McEvoy
Affiliation:
Veterinary Sciences Division, Department of Agriculture for N.Ireland, Stoney Road, Belfast BT4 3SD, U.K.
P McGrattan
Affiliation:
Queen's University of Belfast, Newforge Lane, Belfast BT9 5PX
DJ Devlin
Affiliation:
Department of Agriculture for N.Ireland, Newforge Lane, Belfast BT9 5PX
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Extract

Portal blood flow (PF) is central to the quantitative characterisation of dietary nutrient uptake. Dilution of PAH (p-aminohippurate) is unsuited to rapidly changing flow and visceral studies often use frequent-feeding to encourage “steady-state” digestion and absorption and minimise postprandial PF variation. Such data is of limited value to understanding nutrient flux and visceral responses to conventional feeding (once/twice daily) eg. insulin levels did not differ on similar ME intakes of frequently-fed (12x2h) forage or concentrates (Reynolds and Tyrrell, 1991) whereas in steers fed once daily, insulin was higher (P<0.10) postprandially on a concentrate diet (Thorp et al., 1996). Transit-time ultrasound (TTU) gives real-time, continuous flow but the steer portal vein was regarded as anatomically unsuitable for TTU (Huntington et al., 1990) with PF of less than half those by PAH (20 vs 42ml/min/kg LW). The current study was initiated to monitor temporal PF changes by TTU in steers fed once-daily.

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Information
Proceedings of the British Society of Animal Science , Volume 1996 , March 1996 , pp. 239
Copyright
Copyright © The British Society of Animal Science 1996

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References

Huntington, G.B., Eisemann, J.H. and Whitt, J.M. 1990. Portal Mood flow in steers: comparison of techniques and relation to hepatic blood flow, cardiac output and oxygen uptake. J. Animal Science, 68:1666–1673.10.2527/1990.6861666xCrossRefGoogle Scholar
Reynolds, C.K. and Tyrrell, H.F. 1991. Effects of diet composition and intake on visceral insulin and glucagon metabolism in cattle. Proceedings of the 12th European Assoc.of.Animal Production Symposium, pp l2–15.Google Scholar
Thorp, C.L., Wylie, A.R.G., Steen, R.W.J., McEvoy, J.D. and Shaw, C. 1996. Effect of forage:concentrate ratio in the diet on concentrations of IGF-1, insulin, glucagon and volatile fatty acids appearing across the splanchnic tissues of steers. British Society of Animal Science (Winter Meeting) Paper no. 44.Google Scholar