EVALUATION OF TWO METHODS OF FEED RESTRICTION FOR GROWING-FINISHING HOGS

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Abstract
Two experiments, using 680 barrows and gilts of Lacombe and Yorkshire breeding, were conducted during winter and summer months to evaluate the effect of (a) ad libitum self-feeding, (b) no feeding for 2 or 3 intermittent days each week and (c) limited daily feeding from 60 or from 70 kg body weight, on growth, feed conversion, carcass quality and net economic returns. Daily liveweight gains were significantly reduced by all methods of feed restriction in both experiments. Intermittent fasting 3 days each week decreased the weight gains by severely reducing daily feed intake. Feed conversion was poor in all feed-restricted groups during winter; however, it was slightly improved during summer by intermittent fasting. Regression of backfat thickness on body weight indicated a lower rate of fat deposition in feed-restricted groups. All methods of feed restriction significantly reduced the backfat thickness and improved the carcass index. This improvement of carcass quality was greater for the limit-fed group in both experiments. Intermittent fasting significantly reduced the dressing percentage and gave smaller loin eye area than limited feeding. Economic returns were superior in hogs limit-fed from 60 kg to slaughter and were greater during summer than winter.