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Effect of average daily food intake on production performance in growing pigs

Published online by Cambridge University Press:  02 September 2010

E. Kanis
E. Kanis
Affiliation:
Department of Animal Breeding, Agricultural University, PO Box 338, 6700 AH Wageningen, The Netherlands
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Abstract

Effects of daily food intake (FI) on daily gain (DG), food conversion ratio (FCR), ultrasonic backfat thickness (BF), proportion of lean parts (LP), proportion of fatty parts (FP), lean tissue growth rate (LTGR), fatty tissue growth rate (FTGR) and lean tissue food conversion (LTFC) were investigated in 687 barrows and 98 gilts, slaughtered at a mean live weight of 108 kg and fattened in seven batches. In the range of food intake from about 1·7 to 3·2 kg/day (22 to 42 MJ digestible energy) a continuous distribution of data was available.

Body composition was linearly related to FI. Most regressions of BF and all of LP and of FP on FI were linear, showing fatter animals at higher food intake. For FTGR, BF, LP and FP, parameter estimates based on linear regression were given. Although the response of DG and of LTGR on increasing FI was not always significantly different from linearity, the second degree polynomials indicated diminishing returns in all batches. FTGR had a high linear correlation with FI (0·85 to 0·95), indicating that in the present range of FI a rather fixed proportion of the food was used to deposit fatty tissue.

For DG and LTGR a non-linear model of the type a(FI -fo)b was fitted, where fo was interpreted as maintenance requirement. For FCR and LTFC the corresponding model was FI/(α(FI — fo)b). Both models were preferred over second degree polynomials because of better interpretation of parameters. FCR and LTFC showed minima at about 2·6 and 2·2 kg/day food intake, but especially for FCR the increase at increasing FI was low. Results were not consistent in demonstrating or refuting a plateau in LTGR, which in any event appears to lie near to or beyond ad libitum FI for most pigs.

Type
Research Article
Information
Animal Production , Volume 46 , Issue 1 , February 1988 , pp. 111 - 122
Copyright
Copyright © British Society of Animal Science 1988

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