Journal
CANADIAN JOURNAL OF ANIMAL SCIENCE
Volume 87, Issue 1, Pages 45-55Publisher
AGRICULTURAL INST CANADA
DOI: 10.4141/A05-064
Keywords
pig; total lysine; digestible energy; growth
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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 ly sine: 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 x 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 x lysine:DE ratio interactions were detected for any performance parameter (P > 0.05). The average daily feed intake (ADFI) was 4% greater with pigs on LDE than HDE diets (DE, P < 0.05), but was not affected by lysine:DE ratio (P > 0.05). Conversely, DE did not affect average daily gain (ADG) (P > 0.05), but increased quadratically (day 0 to 14; P < 0.05) and (day 0 to 28; P < 0.10) with increasing lysine:DE ratio. Feed efficiency increased linearly with increasing lysine:DE ratio (P < 0.05) and was 4% greater with the HDE than LDE diets (P < 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.
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