<![CDATA[Crossbreeding program was an option in order to improve Indonesian local goat productivity. In general, crossbreeding is aimed to utilize the benefit ofheterosis (hybrid vigor: HV); where better offspring performance compared to its parents phenotype is expected. Currently, crossbreeding between Boer bucks and Jawarandu does is widely practised; resulting in a crossbred called Boerja. However, information regarding the HV effect were less available. Thus, this study aims to calculate HV in Boer × Jawarandu in relative to the mid-parental average, and relative to the dam phenotype. Mature body weight (BW) of 504 head of goat derived from Boer buck (n=6), Jawarandu doe (n=15), Boerja F1 (n=298), Boerja F2 (n=167), and Boerja F3 (n=18) were analyzed. Backcross system was applied to produce Boerja F2 (Boer ♂ × Boerja F1 ♀) and Boerja F3 (Boer ♂ × Boerja F2 ♀). Result shows that BW in Boer, Jawarandu, Boerja F1, Boerja F2, and Boerja F3 were 79,00 ± 16,21; 29,07 ± 3,76; 41,84 ± 4,12; 41,69 ± 3,68 and 39,96 ± 4,97 kg respectively. The heterosis value of Boerja F1, Boerja F2, and Boerja F3 in relative to the parents average were -23, -31, and -34%, while in relative to the dam were 44, 0, and -4% respectively. According to HV value, it is concluded that the most optimum result of Boer × Jawarandu crossbreeding was found in Boerja F1. Higher Boer breed proportion in F2 and F3 were found to have lower BW.]]>
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