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When other factors lower the sow's feed intake, then the dietary amino acid concentrations need to be adjusted to meet the sow's daily requirements. In contrast to the use gestation period, the lactating use sow can more effectively use use synthetic lysine if the sow has access to feed continually. Because there is a higher feed intake during lactation, there is a continual absorption of nutrients. This allows for full utilization of absorbed synthetic lysine. When synthetic lysine is used in the lactation diet, care should be taken to ensure that methionine, valine, and threonine are not limiting. If a corn- soybean meal mixture is used and formulated to meet the lysine requirement, there is generally no need to provide additional amino-acid supplementation. If the sow is fed only two times per day, the use of synthetic lysine in the lactation diet is not recommended. When constipation is a problem, the addition of a fiber source (wheat bran, beef pulp, alfalfa meal) at a 5% level may be helpful.
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