Abstract
In order to prepare the standards for providing feedstuff to cage swine raising, a fattening test was carried out with swine to be fattened in winter season by using the need for meat productive performance test (with a DCP of 12.9 and a TDN of 70.1), dividing 48 hogs of LH breed into 4 groups by the provided amounts of feedstuff from the boby weight of 30kg up to 90kg. The 4 groups comprisd those with increased feeding in the earlier half of fattening stage, those with standard amount of feeding, those with standard amount of feeding, those with relatively less feeding, and those with less feeding. The results can be summarized as described hereunder.
1. The group with standard amount of feeding (the feeding standard being based on the TDN supply) resulted in a DG of 680.5±66.2g, a FCR of 3.49, a loin eye area of 18.8cm2, and a thickness of back fat (average in 3 portions) of 2.65cm.
2. Increased feeding by 100g over the standard amount at the earlier half of the fattening stage did not prove effective for attaining better results in growth, feed utility, and carcasses.
3. Less feeding by 200-600g than the standard amount at the latter half of the fattening stage (i. e. 2.4kg/60kg bd.wt.-2.7kg/90kg bd.wt.) resulted in inferior DG, but unchanged FCR, with improvements in the area of loin eye, thickness of back fat, and grading of carcasses.
4. Rigid restriction in feeding initiated from the earlier half of the fattening stage resulted in improved carcasses, but extremely poor DG, which is therefore unadvisable.
5. The optimal amount of supply of feed stuff was deemed to be 1.7kg for the period of a body weight of 30-40kg, 2.0kg for the period of a body weight of 40-50kg, and 2.4kg for the period a body weight of 50-60kg, with restriction advisable even thereafter, but not to the extent as applied to the swine to be fattened in summer season.
