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This study aimed to compare the productivity of Sentul chickens and first-generation Kampung chickens (G1) until the age of 3 months. The research material were Sentul chicken and Kampung chicken. The method used was an experiment method or direct observation with a sample of 174 chickens from each strain. The data collected were egg weight, doc weight, body weight, body weight gain, body measurements, and selection response. Data on egg weight, body weight, and body measurements were analyzed using the average difference test (t-test), while the average value vector of body measurements Sentul chicken and Kampung chicken were analyzed using the T2-Hotelling statistical test. To identify the body size and body shape characteristics of Sentul chickens and Kampung chickens were analyzed using principal component analysis. Data processing used the statistical software Minitab version 18. The results of this study showed that egg weight, body weight at the age of DOC-3 months and body measurements of Sentul chickens were significantly different (P<0.05) higher than the Kampung chickens. This study concludes that the egg weight, body weight, body weight gain, and body sizes of Sentul chickens are higher than Kampung chickens. The size characteristic of Sentul and Kampung chickens is chest circumference. The characteristic of the shape of the Sentul chicken is the length of the wings, while the shape of the native chicken is the width of the chest. The selection response and the heritability value of the Sentul chickens was higher than Kampung chikens.

This study aims to determine the relationship between egg morphology and egg weight and DOC weight with body weight of Kampung F1 chickens. The research material was 174 free-range chickens from hatching 315 eggs. The method used: experimental method. Data collected: egg size, egg weight, body weight, body weight gain, and body size. Data on egg size, egg weight, body weight, body weight gain and body size were analyzed using a t-test. The relationship between variables was analyzed regression and correlation analysis. Characteristics of body size and shape were analyzed principal component analysis. The results showed that egg size, egg weight, body weight, body weight gain and body size of male Kampung chickens were different (P <0.05) higher than females. Egg size affects egg weight, and DOC weight affects body weight at 4, 8, and 12 weeks of age. Egg size was positively correlated with male and female egg weights. DOC weight was positively correlated with body weight of Kampung chickens aged 4, 8, and 12 weeks. The closest correlation between egg size and egg weight was egg circumference (0.913), and DOC weight with body weight was weight at 4 weeks of age (0.936). In conclusion, the relationship between egg size and egg weight,  DOC weight and body weight were linear and  had appositive values.