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Effect of dietary forage: concentrate ratio on the behaviour, rumen fermentation and circulating concentrations of IGF-1, insulin, glucagon and metabolites of beef steers and their potential effects on carcass composition

Published online by Cambridge University Press:  18 August 2016

C. L. Thorp ,
A. R. G.Wylie ,
R. W. J. Steen ,
C. Shaw  and
J. D. McEvoy
C. L. Thorp*
Affiliation:
Agricultural Research Institute of Northern Ireland, Hillshorough, Co. Down BT26 6DR School of Agriculture and Food Science, The Queen’s University of Belfast
A. R. G.Wylie
Affiliation:
School of Agriculture and Food Science, The Queen’s University of Belfast Department of Agriculture for Northern Ireland, Newforge Lane, Belfast BT9 5PX
R. W. J. Steen
Affiliation:
Agricultural Research Institute of Northern Ireland, Hillshorough, Co. Down BT26 6DR School of Agriculture and Food Science, The Queen’s University of Belfast Department of Agriculture for Northern Ireland, Newforge Lane, Belfast BT9 5PX
C. Shaw
Affiliation:
Wellcome Laboratory, Department of Medicine, The Queen’s University of Belfast, Royal Victoria Hospital, Belfast BT12 6BA
J. D. McEvoy
Affiliation:
Veterinary Sciences Division, Department of Agriculture for Northern Ireland, Stoney Road, Belfast BT4 3SD
*
† Present address: Dept Agriculture and Food, Seed Testing Station, Abbotstown Laboratory Complex, Snugborough Road, Dublin 15, Ireland.
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Abstract

In an investigation of factors responsible for the lower efficiency of carcass lean gain seen previously in steers offered grass silage diets 18 Simmental × British Friesian steers (361 (s.e. 5-35) kg) were offered one of three diets: a perennial ryegrass silage ad libitum and alone (S) or supplemented with rolled barley at 300 g/kg of total dry matter (SC) or supplemented as described but restricted (SCr) in quantity so as to provide the same dry matter (DM) and digestible energy (DE) intakes as for S. Eating (Eb), ruminating (Rb), standing (Sb) or lying (Lb) behaviour was quantified during four 24-h periods of manual observation. Eb was noted in more detail in a second experiment using computerized Calan-Broadbent gates and load cells to monitor times and rates of eating. Blood was taken via temporary indwelling jugular catheters at 30 to 60 min intervals on each of 4 days 1 month apart. Rumen fluid was sampled hourly for three 24-h periods from three rumen-cannulated steers given the same three diets in a separate 3 x 3 change-over design experiment.

Steers offered the restricted diet SCr ate most of their food in one extended meal within 6 h of feeding while two peak eating periods (morning and evening) were observed in steers offered the other two diets. Steers offered SCr spent more time in Sb (P < 0.05), and less time in Eb (P < 0·001) and Rb (P < 0·05) activities than did animals offered the two diets ad libitum (SC and S). Mean 24 h insulin-like growth factor-1 (IGF-1) concentrations and postprandial insulin concentrations were significantly higher with diet SCr than with diet S (P < 0·001) despite equal daily DM and DE intakes from each. Insulin appearance in the jugular vein reflected the pattern of food intake on all treatments. Rumen fermentation characteristics were largely unaffected by diet. Mean 24 h rumen volatile fatty acid, pH and ammonia concentrations did not differ between diets but post-prandial rumen pH tended to be lower in animals offered the SC and SCr diets.

Differences in patterns of food intake between animals offered food ad libitum and at a restricted level are likely to determine patterns of nutrient absorption and the secretion of nutritionally regulated splanchnic hormones. The higher proportions of Sb and Rb activities in steers offered the restricted diet represent an energy cost to these animals while the higher plasma IGF-1 and insulin concentrations also seen in these animals may collectively influence the partitioning of nutrients to the peripheral tissues and contribute to the increased efficiency of carcass lean deposition previously shown in animals offered such diets.

Keywords

carcass compositionfeeding behaviourpancreatic hormonesrumen fermentationsteer
Type
Research Article
Information
Animal Science , Volume 68 , Issue 3 , April 1999 , pp. 533 - 546
Copyright
Copyright © British Society of Animal Science 1999

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