With the cool temperatures in the upper Midwest for the past month, sale weight of barrows and gilts in the Iowa and Southern Minnesota region has begun its seasonal increase. The 272.0 lb average sale weight last week was 1.6 lb heavier than the summer low of 270.4 lb recorded for the week ending on July 27.

I decided to review the summer patterns for slaughter weight declines in this market. I computed the weekly sale weight for every week of the year versus the sale weight of the first full sales week of the each year beginning with the first week of January in 2004.

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