Summary and Implications
The objectives of this study were to estimate the amount of feed and associated costs of adding weight to cull sows, and, then to estimate the cost/benefit ratio of adding marketable weight to cull sows. As determined by last rib backfat, 8, 17, and 4 sows were classified into initial body condition scores of 1, 2, and 3, respectively. As sows’ BCS increased, the efficiency of adding weight decreases. Average daily gain (ADG) and Feed:Gain (F:G) was greatest in sows that began the trial as a BCS 1 and increased 1 condition score. Both traits declined during the remainder of the trial within all initial BCS.
Iowa State University
Fitzgerald, Robert F.; Stalder, Kenneth J.; Karriker, Locke; Johnson, Colin D.; and Layman, Lori L.
"The Economic Analysis of Feeding Cull Sows to Heavier Weights,"
Animal Industry Report:
AS 653, ASL R2240.
Available at: http://lib.dr.iastate.edu/ans_air/vol653/iss1/66