The evaluation of feeding lactating sows on grams of lysine compared to percent of lysine in the diet

Formulating a sow diet based on percent lysine is only effective when total feed intake is known.
Thursday 9 September 2010 (7 years 7 months 13 days ago)
Different sow amino acid requirement are reported to different as the farrowing number increase. Therefore, two experiments were conducted with 528 multiparous sows (parity 4 and older, 264.8 ± 32.2 kg) to determine which method of diet formulation was better in meeting the needs of the older lactating sow. In the first experiment, 328 sows were randomly allotted to free access to one of five lactation diets containing .85, .95, 1.05, 1.15 or 1.25% total lysine, respectively, throughout an 18.8 ± 2 days lactation period. In the second experiment, sows were fed diets containing 6.4, 7.31, 8.22, 9.12 and 10.3 g of lysine/kg of feed. All diets were formulated to be isocaloric 3.46 Mcal ME/kg and exceeded recommendations (NRC, 1998). Litter numbers were standardized within 48 h after farrowing. Sows were fed with a computerized feeding system that assured true ad libitum feed intake at 72 hours post-farrow for study one and a limited amount of feed not to exceed 5.5 kg/day for study two.

In the first experiment, sow ADFI averaged 7 kg per day. Sow body weight gain was significantly reduced (20.8, 15.7, 17.8, 17.5, 10.4 kg, P ≤.04) as lysine intake increased. However, subsequent performance and average daily pig gain were not significantly different (P ≥.1). In the second experiment, total lysine intake was 35.2, 40.2, 45.1, 50.2, and 56.7 g of lysine per day, respectively. Sow weight gain was not affected by lysine intake. Piglet litter gain was linearly improved (2.18, 2.19, 2.25, 2.35, and 2.43 kg, P ≤.03) with the feeding of additional lysine. In addition, piglet average daily gain was linearly improved as g of lysine increased (.228, .246, .239, .244, and .254, P ≤.03).

In conclusion, the feeding of a minimum of 50 g of lysine per day for older parity sows can improve piglet performance. In addition, formulating a sow diet based on percent lysine is only effective when total feed intake is known. Since total feed intake can vary within a herd, it is better to formulate the sow's requirements based on grams of lysine per day.

L Greiner, J Soto, J Connor, G Allee, J Usry, and N Williams, 2010. Journal of Animal Science, 87 (E-Suppl. 3):55.

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