Keep an eye on wean-to-estrus intervals, advises US expert, by Dr Billy Flowers, North-Carolina State University, Western Hog  Journal, winter 2009, p.35

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Establishing Nutrient Requirements for the Lactating Sow: A Summary of Recent Illinois Research :   S. W. Kim, Ph.D. and R. A. Easter, Ph.D.1  ,

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Relationship of Sow Nutrition and Post-weaning Return to Estrus, by Allen Harper, Extension Animal Scientist, Swine, Tidewater AREC
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NUTRITION AND MANAGEMENT STRATEGIES TO OPTIMISE PERFORMANCE OF THE MODERN SOW AND BOAR, by W. H. Close, Close Consultancy, Wokingham, Berkshire D.J.A. Cole, Nottingham Nutrition International, East Leake Loughborough, Leics.
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Effect Of Weaning Age on Sow Herd Performance, by Dr. Todd See, Swine Genetics Specialist, North Carolina State University
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Weaning to Rebreeding Interval, by Tri-State Swine Nutrition Guide
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FACTORS AFFECTING LACTATION FEED INTAKE OF THE SOW , by Dr. Brian Hardy, NutriVision Inc.
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Feeding Sows for a Rapid Return to Estrus after Weaning ,  by Mark Estienne, Swine Research Physiologist, and Allen Harper, Extension Animal Scientist-Swine, Tidewater AREC
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Improving reproduction through nutrition, by Walter Scharlach
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Genetiporc, Swine genetic reference
Consult their web site