CALCULATION OF RESPONSE TO SELECTION FOR POPULATION WITH PEN (NESTED FULL-HALF SIB) STRUCTURE

In this paper we consider the case of a hierarchial organized breeding structure typically for poultry breeding. That means the population i s divided into nested full-halb sib families. The selection is carried out within the half sib groups (pens) and in order to produce the new generation the males ''change'' over the hatchs. By using formulas fr om literature in this paper an approximation for the selection gain is derived, which results from above selection scheme. The approximation is found by using a statistical model with fix sire effects on genera tion one and additional with fix grandsire effects on generation two. The approximation is compared with Monte Carlo results.