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Effect of protein intake on energy and nitrogen balance and chemical composition of gain in growing boars of high genetic potential

Published online by Cambridge University Press:  02 September 2010

D. S. Rao  and
K. J. McCracken
D. S. Rao
Affiliation:
Department of Food and Agricultural Chemistry, The Queen's University of Belfast, Newforge Lane, Belfast BT9 5PX
K. J. McCracken
Affiliation:
Department of Food and Agricultural Chemistry, The Queen's University of Belfast, Newforge Lane, Belfast BT9 5PX Food and Agricultural Chemistry Research Division, Department of Agriculture for Northern Ireland, Newforge Lane, Belfast BT9 5PX
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Abstract

The effects of dietary protein (151 to 282 g crude protein per kg dry matter (DM)) and lysine (8·5 to 16·4 g/kg DM) on the carcass composition and energy metabolism of entire male pigs, given food close to appetite, was studied from 33 to 88 kg. Four replicates (three Landrace and one Duroc) of four littermates were used. Energy and nitrogen (N) balances were conducted at approximately 35 to 43, 58 to 65 and 78 to 85 kg and body composition was determined at slaughter. There was no effect of dietary treatment on the crude protein content of the empty body (EBW) but the DM (P < 0·001), fat (P < 0·001) and ash (P < 0·05) proportions and fat: protein ratio in EBW (P < 0·01) increased with decreasing dietary protein level. The mean maximum protein retention was 183 g/day. Retention of protein (P < 0·05) and proportion of protein energy in the gain (P < 0·01) decreased linearly and fat retention (P < 0·001) and energy content of the gain (P < 001) increased with decreasing dietary protein. The N retention values calculated from balance data were proportionately 0·21 higher at high protein intakes (509 g/day) and 0·056 higher at low protein intakes (329 g/day) than the values obtained by slaughter. Using the ideal protein system the value for the efficiency of utilization of apparently digested ideal protein for protein deposition (a2) fell linearly (P < 0·001), based on the slaughter data, as dietary protein content increased. Heat production, calculated from slaughter data, was proportionately 0·07 higher than that measured by indirect calorimetry and 0·17 higher than the computed value for heat production using the standard values of energy costs for maintenance and for protein and fat deposition.

Keywords

boarscarcass compositionenergy intakegrowthprotein intake
Type
Research Article
Information
Animal Production , Volume 51 , Issue 2 , October 1990 , pp. 389 - 397
Copyright
Copyright © British Society of Animal Science 1990

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