Konservasi lutung jawa (Trachypithecus auratus) yang merupakan primata endemik Indonesia berstatus vulnerable dilakukan di Gembira Loka Zoo. Pengamatan interaksi sosial dan reproduksi dapat menjadi faktor pendukung dari keberhasilan rehabilitasi di penangkaran. Telah dilakukan penelitian mengenai interaksi sosial dan reproduksi lutung jawa (Trachypithecus auratus E. Geoffroy, 1812) jantan dan betina di Gembira Loka Zoo, Yogyakarta. Penelitian ini bertujuan untuk menganalisis interaksi sosial dan reproduksi 2 kelompok lutung jawa jantan dan betina pada 2 kandang yang berbeda. Pengamatan dilakukan pada 4 pasangan, yang terdiri dari P1 (jantan A dan betina 1A), P2 (jantan A dan betina 2A), P3 (jantan 1B dan betina B), serta P4 (jantan 2B dan betina B). Metode yang digunakan yaitu metode scan sampling dan ad libitum dengan interval 10 menit. Berdasarkan hasil penelitian, interaksi sosial yang teramati adalah body contact, proximity, allogrooming, non-contact aggression, dan contact aggression. Interaksi sosial didominasi oleh interaksi sosial affiliative dibandingkan agonistik. Frekuensi interaksi sosial affiliative tertinggi teramati pada P3 (30,44%) dan interaksi sosial agonistik tertinggi teramati pada P1 (1,29%). Sementara itu, interaksi reproduksi yang teramati adalah atraktivitas, proseptivitas, dan reseptivitas, dengan frekuensi atraktivitas dan proseptivitas tertinggi teramati pada P3 (70,11%), sedangkan frekuensi reseptivitas tertinggi pada P2 (3,45%). Hasil uji Kruskal-Wallis menunjukkan adanya perbedaan signifikan (Asymp. Sig < 0,05) pada perilaku proximity, allogrooming, atraktivitas dan proseptivitas, serta menunjukkan tidak adanya perbedaan signifikan (Asymp. Sig > 0,05) pada perilaku body contact, non contact aggression, contact aggression dan reseptivitas. Selama pengamatan, teramati adanya interaksi sosial dan reproduksi lutung jawa antarkandang yang berbeda.

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Conservation of  Javan lutung (Trachypithecus auratus), an endemic primate of Indonesia classified as vulnerable, is conducted at Gembira Loka Zoo. Observations of social interactions and reproductive can be supportive factors for the success of rehabilitation in captivity. Research has been conducted on the social interactions and reproduction of male and female Javan langur (Trachypithecus auratus E. Geoffroy, 1812) at Gembira Loka Zoo, Yogyakarta. This study aims to analyze the social interactions and reproductive of two groups of male and female Javan langurs in two different enclosures. Observations were made on four pairs, consisting of P1 (male A and female 1A), P2 (male A and female 2A), P3 (male 1B and female B), and P4 (male 2B and female B). The methods used were scan sampling and ad libitum with a 10-minute interval. Based on the results of the study, observed social interactions included body contact, proximity, allogrooming, non-contact aggression, and contact aggression. Social interactions were dominated by affiliative social interactions compared to agonistic ones. The highest frequency of affiliative social interactions was observed in P3 (30.44%), while the highest frequency of agonistic social interactions was observed in P1 (1.29%). Meanwhile, observed reproductive interactions included attractivity, proceptivity, and receptivity, with the highest frequency of receptivity was observed in P2 (3.45%). Kruskal-Wallis test results showed significant differences (Asymp. Sig < 0.05) in proximity behavior, allogrooming, attractiveness, and proceptivity, while showing no significant differences (Asymp. Sig > 0.05) in body contact, non-contact aggression, contact aggression, and receptivity behaviors. During the observation, social and reproductive interactions between different enclosures of Javan langurs were observed.