Pig production in Asia: 1. The effect of different feeds on pig performance I. Improving the utilization of feed concentrates A. Recent research into pig feeding B. Recent research into pig feeding - Taiwan ROC II. Use of locally produced pig feeds A. Recent research into pig feeding - Korea B. Utilization of local feed resources: Recent research into Leucaena as a swine feed C. Utilization of copra in pig feed in the Philippines