Telah dilakukan penelitian pada kukang sumatera (Nycticebus coucang) di penangkaran PSSP. Tujuan dari peneltian ini adalah untuk mengamati ada atau tidaknya pengaruh tekanan lingkunan terhadap kukang yang telah hidup di penangkaran selama ±8 tahun. Subjek penelitian meliputi kandang K1: satu kukang jantan, satu kukang betina, satu anak; kandang K2: satu kukang jantan; kandang K3: satu kukang jantan dan satu kukang betina. Penelitian meliputi pengamatan aktvitas sang hari (diurnal) pada pukul 09.00-15.00 (GMT+7) dengan metode scan sampling interval 10 menit tanpa jeda selama 1.920 menit dalam satu bulan, serta pengukuran kadar hormon kortisol feses dengan metode kompetitif ELISA (Enzyme-Linked Immunosorbent Assay). Konsentrasi kortisol didapatkan melalui konversi nilai OD terhadap kurva standar persamaan y= 1/(-2.12642 + 6.381724x2.47709) dan y= 1/(-5.0690 + 2.89654x4.099722). Hasil penelitian menunjukkan aktivitas diurnal pada kukang dengan persentase rata-rata terbesar meliputi unseen 94,12% pada K1, sleeping 45,22% pada K3, dan resting pada 33,05% K2. Kadar kortisol terdeteksi berfluktuasi, kadar kortisol tertinggi adalah 0,6 ng/ml dan terendah 0,02 ng/ml.

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Research on slow loris (Nycticebus coucang) has conducted in Primate Research Center, Bogor. This research aim to examine the presence of environmental influence to Nycticebus coucang which have been living in captivity for ±8 years. Subject on three cages consist of K1: one male and one female with an infant; K2: one single male; K3: one male and one female.

Behavioural observation during the day (diurnal) had been done at 09:00-16:00 (GMT +7) through scan sampling method with 10 minutes interval without pause for 1.920 minutes for one month. Cortisol level had been measured with the competitive-ELISA (Enzyme-Linked Immunosorbent Assay) method. Cortisol level obtained through conversion of OD value with standard curve y= 1/(-2.12642 + 6.381724x2.47709) and y= 1/(-5.0690 + 2.89654x4.099722).

Result of the study showed diurnal activities with highest average percentage are unseen 94,12% on K1, sleeping 45,22% on K3, and resting 33,05% on K2. Cortisol levels are fluctuating. Highest cortisol level is 0.6 ng/ml and the lowest is 0.02 ng/ml.