Under which act shall livestock be weighed by a weigh master when sold on the basis of weight?

The correct answer relates to the Federal Packers and Stockyards Act, which governs the marketing of livestock and establishes regulations for various transactions that involve the buying and selling of livestock based on weight. Under this act, it is required that a weigh master accurately weigh livestock to ensure fair trading practices and transparency in pricing.

The Federal Packers and Stockyards Act aims to protect farmers and ranchers from unfair practices and ensure that all transactions are conducted in a manner that is equitable and efficient. By requiring that livestock be weighed by a certified weigh master when sold based on weight, the act helps prevent discrepancies and disputes regarding the actual weight and, consequently, the price for which the livestock is sold.

The other options do not serve this specific regulatory function directly related to livestock transactions based on weight. For instance, the CA Livestock and Commission Act may pertain to state-level regulations but does not specifically enforce weigh master protocols in the broader context of federal oversight. The Wholesale Meat Packers Association focuses more on the interests and issues of meat packers rather than on specific regulations about livestock weighing. USDA is a broad agency that oversees a multitude of agricultural matters, but it does not specifically regulate weight verification in the context of sales. Thus, the Federal Packers and Stockyards Act stands out