Results from the current study showed that chemical composition of goat milk changed significantly over lactation, resulting in variation in yields and sensory qualities of hard and semi-hard cheeses. While casein content of goat milk did not change significantly as lac tation advanced, SCC increased from early lactation to late lactation. This study also showed there wereno sig nificant differences in flavor, body and texture, and to- tal sensory scores ofboth cheesesbetween 8, 16 and/or24 week aging. which indicate that the cheeses should be marketed and consumed after 8 week of aging, In hard cheese, high correlation coefficients were found between milk fat, protein or total solids and cheese revealed the need yield. The findings from this study to adjust cheese making procedures over the duration of lactation to increase milk nutrient recoveries and thus increase cheese yield. A larger number of obser- vations and a smaller size of batches are recommended for future studies on cheese yield. Flavor compounds hould be further determined and texture profile anal ysis applied to monitor the delicate changes of flavor and texture in goat milk cheeses during aging process to complement sensory evaluation