Simulation of growth performance of heavy pigs with different inherent growth characteristics kept on two restricted feeding planes

A mechanistic mathematical model was run to simulate the effect on average daily gain (ADG) and feed conversion ratio (FCR) of two different kind of pigs and two different feeding regimes. Theoretical values, taken from literature, were used as inputs to describe a poor and a improved genotype. To describe the feed, experimental measurements of feed composition and feed consumption, taken over 5 consecutive periods of growth from two groups of pigs, from 25 to 160 kg of live weight, were also used as inputs, The simulated ADG and FCR values were compared with the experimental performance. Across periods the experimental pigs showed ADG and FCR within the simulated ranges obtained for the theoretical pig genotype. It was concluded that the model was sensible to the variations of pig genotype and of feeding regime. It provided reasonable response both in term of pattern and magnitude.