Bondoc, O., and J. Isubol. “Reasons for Culling in Relation to Longevity and Lifetime Efficiency of Landrace and Large White Sows in a Nucleus Breeding Farm in the Philippines”. Tropical Animal Science Journal 45, no. 1 (February 4, 2022): 30–36. Accessed March 26, 2026. https://journal.ipb.ac.id/tasj/article/view/35606.