5.1.19 mtrait

mtrait toggles between single- and multiple-trait BP: 1 does only ST to save CPU time, 3 does MT MFP, and 4 does MT MFPS. Single trait best prediction is computationally the fastest. Both methods provide similar solutions, although MT prediction is preferred for calculating fat and protein yields under alternative testing schemes when components are not sampled monthly.
mtrait = 1

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