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C.R., Lumbansiantar, N. W. T. Inggriati, & I G. Suarta.
" THE LEVEL OF MOTIVATION OF FARMERS IN  INTENSIVE PIG BREEDING   (Case Study in Sipinggan Lumbansiantar Village Nainggolan  District Samosir Regency North Sumatra Province)." <em>Jurnal Peternakan Tropika</em> [Online], 12.4 (2024): 458- 481. Web.  6 Sep. 2026