Local Indonesian chicken from Bangka Belitung is known as Merawang. This chicken has dual purposes as a meat and egg producer. The objective of this study was to determine the repeatability and most probable producing ability (MPPA) of Merawang chicken’s egg weight and one-day-old chick (DOC) weight. 72 pullet Merawang chickens were raised in single bird cages and their egg weight was checked at 36-38 and 56-58 weeks. The DOC was weighed after the eggs were hatched. The rptR package and the restricted maximum likelihood (REML) method were utilized to estimate the repeatability. At 36-38 and 56-58 weeks, the average egg weight was 46.435.44 and 52.146.15, respectively. Meanwhile, the average DOC weight at 36-38 and 56-58 weeks were 31.92±4.54 and 35.40±4.36, respectively. The result showed that at 36-38 and 56-58 weeks, the repeatability of egg weight was 0.77±0.05 and 0.69±0.05, whereas the DOC weight was 0.84±0.04 and 0.64±0.07. The average MPPA ranges based on egg and DOC weights were 46.51-52.23 and 31.97-35.52, respectively. The pullets with MPPA above the average were 38.46%-50.72% (egg weight) and 48.94%-56% (DOC weight). The results from this study can be used for selecting the Merawang pullet.

The uniformity of live weight in the early stage (DOC) is an indicator applied to evaluate the quality of brooding, raising, and growth management. This study aims to compare the live weight uniformity of DOC in three local breeds as a parental group, namely Merawang A and B (n:196), Murung Panggang (n:157), and KUB (n:416), as well as in five groups of Bulaksumur (BS) for crossbred group, namely BS-1 (n:136), BS-2 (n:76), BS-3 (n:106), BS-5 (n:81), BS-6 (n:164). The live weight data of DOC was obtained in Gunungkidul Regency under similar management. The results show that the BS groups had higher live weight (31.9 g ± 3.1) compared to Merawang A (24 g ± 3.1), Murung Panggang (28.2 g ± 2.3), and KUB (28.1 g ± 2.8). Furthermore, the live weight uniformity on the BS DOC averaged 71% across all groups, with the highest uniformity being BS-3 (87%). Murung Panggang had a higher live weight uniformity (82%) compared to Merawang A and B (42%, 64%) and KUB (63%). The average coefficient variance was less than 10%, except for Merawang A and BS-2 with 13.09% and 11.35%, respectively. In conclusion, the DOC of the crossbred (BS) was more uniform than its parental groups. However, to distinguish the significantly different in the chicken live weight in early stage, further analysis needs to be conducted in the future.