Despite years of trying to breed out differences in pig herds there are still variations in pig characteristics. An Experiment was conducted to see if early growth rates had an impact on energy utilization later in a pigs life. This could help with matching diets closer to pigs specific needs. Sixty barrows were tracked through-out there time in the nursery and removed once they reached 30kgs. They were then put into one of three groups slow, average, or fast growing. From these groups pigs were put on one of two diets, high or low energy  and also pigs were either fed ad libitum or 85% ad libitum. After the pigs were removed at 60kgs their carcasses were ground and they were examined. Fast growing pigs took 71 days to reach 30kgs, average pigs took 78 days and slow pigs took 98 days. Despite this the time to grow from 30 to 60kgs was not significantly different.  A higher energy diet had no effect on growth rate but the higher energy diet produced less feed intake and therefore better feed efficiency. Pigs fed complete ad libitum had improved growth compared to the incomplete ad libitum. Energy utilization had no significant differences between fast, average and slow growing pigs. The efficiency of the utilization of dietary energy for growth was comparable among pigs selected for high or low potential growth rate. This implies that segregating pigs and feeding based on PGR is not a tool that will improve our ability to match feed to requirements.