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The Boer and PE goat was used as a model in the outbreeding application to look at the genetic mechanism responses. The purpose of this research to analyze the estimation of heterosis effect on the birth weight of the Boer and PE goat crosses. The total data used in this experiment were birth weight (BW) data from F1 (89 tails) and F2 (16 tails), respectively. Data analysis was estimated by calculating the probability of BW using the average formula and standard deviation based on Noor (1996) formula. The results of the data analysis using the formula above, carried out further using "t-test" to know the difference in the birth weight of F1 and F2 with ? 0.05. The heterosis effect was analyzed based on Harjosubroto (1994) formula. The results of this research that BW of F1 and F2 were 3,91±0,88 kg and 3,47±0,76 kg, respectively. The results were higher than BW of Boer goat and PE goat (3,3 kg). The ration of BW between F1 and F2 was not significant (P>0,05). Heterosis effect analysis of F1 (46,67%) and F2 (32,17%) were higher than parental. It would be concluded that the result of birth weight very large released by sex of goat. The average of the male group had higher ??than the female group. The effect was caused by the Boer goat as male in passing down the transition. The effect of heterosis on goats from the highest crosses in the first generation (46.67%), and reduced in the second generation (32.17%). The heterosis effect value could be made as a basis for future selection program.
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