Study was undertaken to determine variations in biometric parameters within and between the Tiv and Fulani local chickens. The study was carried out at the Livestock Teaching and Research Farm of the Faculty of Agriculture, Shabu-Lafia Campus, Nasarawa State University, Keffi, Nasarawa State. A total of 110 birds comprising of 10 hens and 1 cock from each of five randomly selected locations for the Tiv and the Fulani chicken ecotypes were purchased and used as the base population. A mating ratio of 1 cock to 10 hens was applied to generate the experimental birds. After successful four batches of hatching, 538 chicks comprising 354 and 184 chicks for the Tiv and the Fulani ecotypes respectively were generated. The birds were raised according to their ecotype and location. Data were collected on biometric traits such as such as body length, shank length, wing lengths and breast girth. The data were subjected to appropriate statistical analysis using the SPSS statistical package. The results indicate that mean linear body measurements increased with advancing age until maturity in both ecotypes. The coefficients of variation (CV) values were generally higher in the Tiv ecotype compared to the Fulani ecotype. In the Tiv ecotype, the highest CV value (42.21 %) was noted in the breast girth at 8 week of age. However in the Fulani ecotype, wing length at week 1 showed the highest CV value (14.23 %). The Fulani ecotype had significantly (P<0.05) higher body length, wing length, shank length and breast girth compared to the Tiv ecotype at all ages. Batch of hatch had significant effect on body linear measures in both ecotypes. In the Tiv ecotype, birds in batch 1 had significantly (P<0.05) higher body linear parameters compared to other batches at weeks 1, 4, 8, 12 and 16 except at at week 20 where batch 3 and 4 demonstrated significantly (P<0.05) higher wing length and breast girth. In the Fulani ecotype, batch 1 at weeks 1 and 4 had significantly (P<0.05) better breast gi