| http://www.w3.org/ns/prov#value | - In addition, as shown in FIG. 13, which is a sample screen shot of a centralized type grouping screen 120, each sow is provided with a universal four digit number 122, which number may be permanently placed on a sow such as by painting, branding, or tattooing or other means of visually marking and is also used to keep track of the sows.
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