Brumm Speaks Out: More on carcass weight feed conversion

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This past week I’ve been working with research data looking at various combinations of wheat middlings (midds) and distillers dried grains with solubles (ddgs) in grow-finish diets. I’ve also been reviewing the recent literature on these diets. The result of this effort is to further support my blog of a few weeks ago that the US industry must start examining feed conversion on a carcass weight basis.

Let’s look at some of the published data so you can better understand what I’m talking about. In a Journal of Animal Science paper (JAS 90:2620-2630), KState researchers fed diets containing various combinations of ddgs and midds to grow-finish pigs with an average on-test weight of 102.5 lb. Pigs were fed to a constant sale date. The converted data table from the publication follows.

At first glance, the differences in feed conversion don’t look that great with increased ddgs and midds in the diet. However, the control pigs were 11.2 lb heavier at slaughter than the 30/20 diet pigs with a 14.3 lb heavier carcass.

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