Final answer:
The percentages of different Yield Grades in a pen of cattle do not indicate a violation of Do Not Hold policies, as these policies typically relate to the duration cattle are held, not to the yield grades of the meat. Therefore, the statement is false.
Step-by-step explanation:
The question you're asking pertains to cattle grading and seems to involve compliance with Do Not Hold policies related to livestock and meat processing. Do Not Hold policies are typically rules set by a meatpacking facility that prevent holding cattle for an excessive period before slaughtering, ensuring the quality of the meat remains high. The percentages mentioned, 50% Yield Grade (YG) 3, 25% YG 4, and 25% YG 5, indicate the composition of meat yield grades among the cattle group. Grades 4 and 5 are usually less desirable, with higher fat content and less lean muscle. Even without a direct reference to specific Do Not Hold policy details, a pen with these percentages wouldn't necessarily violate a Do Not Hold policy just based on the yield grades alone, since Do Not Hold typically concerns the length of time animals are held, not the grades of meat they produce. Therefore, the statement is False.