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Amino acids should be defined in relation to dietary energy concentration in diets for young pigs. However, the literature contains diverse estimates of the optimum lysine:digestible energy (DE) ratio for weanling pigs performing at levels commonly observed in commercial practice. Further, there is a poor understanding of the reponse of the weanling pig to dietary energy concentration. A growth experiment was conducted to define the optimum total lysine:DE ratio for pigs from 4 to 8 wk of age. Dietary treatments were arranged as a 2 × 5 factorial: low (LDE, 3.4 Mcal kg -1 ) or high DE (HDE, 3.6 Mcal kg -1 ) and the following total lysine:DE ratios: 3.7, 4.0, 4.3, 4.6, or 4.9 g Mcal -1 ). The experiment ran for 28 d, beginning 7 d post-weaning, using four pigs per pen and six pens per diet for a total of 240 pigs (27 ± 2 d; 7.5 ± 1.1 kg). No DE × lysine:DE ratio interactions were detected for any performance parameter (P &gt; 0.05). The average daily feed intake (ADFI) was 4% greater with pigs on LDE than HDE diets (DE,P   0.05). Conversely, DE did not affect average daily gain (ADG) (P &gt; 0.05), but increased quadratically (day 0 to 14; P &lt; 0.05) and (day 0 to 28; P &lt; 0.10) with increasing lysine:DE ratio. Feed efficiency increased linearly with increasing lysine:DE ratio (P &lt; 0.05) and was 4% greater with the HDE than LDE diets (P &lt; 0.05). The optimum total lysine:DE ratio for ADG was determined to be 4.46 and 4.27 g Mcal -1  for pigs between 7.5 to 13 kg and 7.5 to 22.5 kg BW, respectively. Key words: Pig, total lysine, digestible energy, growth

The effect of dietary energy concentration and total lysine/digestible energy ratio on the growth performance of weaned pigs