Abstract:
Proboscis monkey (Nasalis larvatus) is a type of primate that is selective for its food. They
choose food sources according to the nutrients their bodies need. When food sources are
running low, proboscis monkeys will look for other low-nutrient food sources to eat. This
research aims to analyze the nutrition of proboscis monkey feed sources in Bakut Island
Nature Park. The data collection technique used a test sampling method in the field in the
form of plant parts eaten by proboscis monkeys. Then the sample material was brought to
the laboratory for proximate analysis to determine the content of water, ash, crude protein,
crude fat, crude fiber, and carbohydrates. The results showed that there were eight
vegetations that became the source of proboscis monkey's food. The composition of the feed
that consumed the most was leaf shoots with 80% and fruit with 20%. The proximate test
results show that the water content is the parameter that has the highest valuofom the other
parameters in the entire sample. Tambal Ulang has the highest water content, which is
78.05%. The highest carbohydrate content was found in banyan leaves at 42.88%, the
highest protein content was in hibiscus leaves at 6.94%. Banyan leaves have the highest
crude fiber content of 8.33%. The highest ash content was hibiscus leavat of 4.61%.
Ketapang leaves have the highest fat content of 0.61%.
