Hello Marks, first, the alone selection can be carried out in livestock of pure race, in your case, these using female F1, and therefore the behavior that these observing is due to the heterosis (in this case individual heterosis) and the effect that causes disappears in the following generation, therefore, not you procupes for the heredabilidad of this characteristic.
The design that you outline to carry out is a cruzamiento of three races, the one which, it allows to increase the productive behavior due to the use of the maternal heterosis (to use crossed mothers and sires of a race different to that of the mothers), and this proven one that one obtains an additional increment in connection with the individual heterosis when taking advantage of the maternal heterosis, but everything depends that you choose the appropriate sire.
The characteristics of the sire Chetapuy, indicates that they can obetner good results, not alone in maternal characters (example, litter size, viability in the breedings) but also in the paternal ones (earnings of weight and quality of the channel, for example).
A question which the objective of having these groups of sows Yorkshire*Hamshire and F1 Landrace*yorkshire? these carrying out some experimental work (thesis)?
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