Ontario Pork

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Prairie Swine Centre is an affiliate of the University of Saskatchewan


Prairie Swine Centre is grateful for the assistance of the George Morris Centre in developing the economics portion of Pork Insight.

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Author(s): S. Moehn, D. Franco, P.B. Pencharz and Ronald O. Ball
Publication Date: August 13, 2011
Reference: Advances in Pork Production (2011) Volume 22, Abstract #09
Country: Canada

Summary:

The objective of this study was to determine the threonine requirement for maintenance in adult sows using the indicator oxidation technique. Four non-pregnant Hypor Hybrid (Hypor Inc) sows (233.0±18.6 kg BW) were adapted to 2.2 kg of a semi-synthetic diet containing 14.0 MJ ME/kg and 3.77 g/kg threonine. Each sow received 6 test diets, in random order, providing threonine intakes of 20, 40, 60, 100, 120 and 140 mg/kg0.75. After adaptation to each diet, indicator amino acid oxidation using L-[1-13C]-PHE was determined simultaneously with indirect calorimetry for 4 h. Plateaus in oxidation were achieved within 1.5 h. PHE oxidation decreased as threonine intake increased up 100 mg/kg0.75 BW, and did not change at greater threonine intakes. Maintenance threonine requirement, calculated by breakpoint regression analysis, was 98 mg/kg0.75. Heat production was linearly correlated (r = 0.70, P = 0.001) with PHE oxidation. Heat production responded in a quadratic manner to threonine intake, and was minimized at a threonine intake of 72 mg/kg0.75. The mean respiratory quotient (RQ, 1.067±0.011) showed that dietary energy was not limiting. RQ was greatest (P<0.001) at threonine intake of 87 mg/kg0.75.  The reduced heat production and increased RQ at threonine intakes close to the requirement indicate that maximum energetic efficiency is achieved when both amino acid deficiency and excess are avoided.

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