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Effect of feed intake on protein and energy retention of boars of high genetic potential for lean growth

Published online by Cambridge University Press:  24 November 2017

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

The daily rate of lean deposition achieved by growing pigs is a function of a wide range of factors including genotype, gender, liveweight and intake of energy/protein. The review of ARC (1981) highlighted the controversy surrounding the effects of liveweight and energy intake on lean deposition. Recent publications suggest that there are interactions between these factors and also with genotype. In contrast to the linear/plateau relationship between energy intake and protein deposition proposed by Whittemore and Fawcett (1976), Campbell and Taverner (1988) observed a linear response in protein deposition up to the highest energy intake achieved, with pigs of improved genotype. The slope of the relationship was much greater than that observed in previous studies (ARC 1981). In a recent experiment, McCracken and Rao (1989) have shown that high-lean pedigree boars can achieve protein deposition rates as high as 200 g/d over the liveweight range of 33 to 88 kg. At present there is no published information on the response of such pigs to energy intake though the low rates of fat deposition observed suggest that energy intake could be limiting protein deposition. The experiment described below was designed to measure the response of protein deposition to energy intake at a series of liveweights between 33 and 88 kg. The diet and the treatments were chosen to obtain a wide range of energy intakes above and below those observed with dry, pelleted diets.

Type
Pig Production
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1990 , March 1990 , pp. 92
Copyright
Copyright © The British Society of Animal Production 1990

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References

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