Abstract
In order to prepare the standards for providing feedstuff to cage swine fattening, a fattening test was carried out with 24 hogs of LH breed from the body weight of 30kg up to 90kg by using the proposed feeding amount which had less TDN at the latter half of fattening stage than the feeding standards (1.7kg/30kg BW. -2.7kg/90kg BW.) and with a control of the amount proposed by the Japanese Standards for Swine Feeding. The feedstuff used for the test was the new feed for meat productive performance test in Japan (with a DCP of 12.9 and a TDN of 70.1).
The results were as summarized hereunder.
1. No difference was seen between the tested and the control groups in terms of the days needed for fattening from a body weight of 30kg up to 90kg and of the average daily gain.
2. It was noted that further studies would be needed on the amount of feeding over a body weight of 90kg as DG sharply dropped after reaching a body weight of 80kg when the proposed feeding amount was appiled.
3. No difference was seen between the tested and the control groups in terms of feed intake and feed conversion rate.
4. The results of test on the carcasses revealed that the carcasses were obviously improved in the groups of proposed feeding in terms of the area of loin eye, thikness of back fat, and grading of carcasses.
5. No adverse effect was seen upon the quality of meat even with restriction of feed consumption.
6. The optimal feeding ration in the cage swine raising assessed from the results of the present test would be approx. 1.7kg for those with a body weight of 30-40kg (80-100 days of age), approx. 2.0kg for those with a body weight of 40-50kg (100-120 days of age), approx. 2.4kg for those with a body weight of 50-65kg (120-140 days of age), approx. 2.2kg for those with a body weight of 65-80kg (140-160 days of age), and approx. 2.7kg for those with a body weight of 80-90kg (160-180 days of age).
