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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

Published online by Cambridge University Press:  05 November 2021

C.L. Thorp ,
A.R.G Wylie ,
R.W.J Steen ,
J. McEvoy  and
C. Shaw
C.L. Thorp
Affiliation:
ARINI, Hillsborough, Co. Down, BT26 6DR, N. Ireland
A.R.G Wylie
Affiliation:
Queens University, Belfast, N. Ireland
R.W.J Steen
Affiliation:
ARINI, Hillsborough, Co. Down, BT26 6DR, N. Ireland Queens University, Belfast, N. Ireland
J. McEvoy
Affiliation:
Veterinary Science Division, DANI, N. Ireland
C. Shaw
Affiliation:
Welcome Laboratory, Royal Victoria Hospital, Belfast, N. Ireland
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Extract

Steen (1992) demonstrated that grass silage diets sustained lower carcass lean gain per MJ digestible energy (DE) intake than diets of low forage: concentrate ratios (F:CR), at equal levels of DE intake. Jugular concentrations of IGF-1, insulin and glucagon were significantly elevated in animals offered the latter diets while rumen VFA were unaffected (Thorp et al1994). Both IGF-1 and insulin stimulate protein synthesis (Abdul-Razzaq and Bickerstaffe 1989, Douglas et al1991) and it is generally accepted that insulin and glucagon influence carbohydrate metabolism in the ruminant. Plasma propionate and butyrate stimulate insulin and glucagon secretion (Harmon 1991). This experiment was part of a series designed to investigate the control of lean and fat deposition in beef cattle and aimed to determine concentrations of IGF-1, insulin, glucagon and VFA appearing across the splanchnic tissues.

Type
Ruminant Nutrition & Metabolism In Vivo
Information
Proceedings of the British Society of Animal Science , Volume 1996 , March 1996 , pp. 44
Copyright
Copyright © The British Society of Animal Science 1996

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References

Thorp, C.L., Steen, R.W.J., Wylie, A.R.G., McEvoy, J. and Shaw, C. (1994). Anim. Prod. 58:444.Google Scholar
Steen, R.W.J. (1992) Anim. Prod. 54:450.Google Scholar
Douglas, R.G., Gluckman, P.D., Ball, K., Breier, B. and Shaw, J.H.F. (1991). J. Clin. Invest. 88: 614.10.1172/JCI115346CrossRefGoogle Scholar
Harmon, D.L. (1991). Proc. 12th Symp. EAAP. ppl6.Google Scholar
Abdul-Razzaq, H.A. and Bickerstaffe, R. (1989). Brit. J. Nutr. 62:297.10.1079/BJN19890031CrossRefGoogle Scholar