STUDIES ON THE SWINE RAISING IN CAGES
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概要
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Experiment I: Structure of cage floor: The effects of the longitudinal and lateral types of structures of plastic drainboards in the cages for swine raising upon the growth and meat productivity of swine were studied.The results revealed that better growths were attained with the lateral type in both seasons of spring and autumn on the basis of average results of a year; the days required for fattening and the mean daily weight gain were respectively 97.4 days and 61.96g, showing slightly better results over those of the longitudinal type. The longitudinal type demonstrated slightly better results in the earlier half of fattening but were poorer in the latter half than the lateral type.The feed conversion rate of the swine on the lateral type was 3.40, which was slightly better than that of the longitudinal type. The loin eye area of the group with the longitudinal type tended to be slightly better than the lateral type among other findings on the carcass. However, there was no significant difference between the two groups in terms of dressing percentage of carcass, length of carcass, thickness of back fat or ratio of ham.Summarizing the results of findings on the growths and carcass, it can be claimed that the plastic drainboards for cages should be of the lateral type for attaining better growths, but further studies would be required on the influences of the materials and measurements of the drainboards upon the growths of swine.Experiment II. Number of swine to be admitted into cages: Group raising methods will have to be studied in the swine raising in cages as costs for facilities are substantial and the animals tend to have weak legs. With 24 crossbreds of LW, we studied on their growth and meat productivity through varying raising numbers of single, two and four animals admitted in cages and through limited feeding of twice a day of the approved feed for the period from the body weight of 30kg up to 90kg. The following results were attained.1. The single raising group demonstrated the best growth, and a trend was noted that as the number of the animals admitted in a cage increased, the daily mean weight gain and feed conversion rate were less favorable.2. However, the gross findings on the legs and hooves (weak legs) were in the trend contrary to that of the growth. The motility of the swine raised in the groups of 4 was very smooth and showed least adverse effect, followed by the groups of two and single.3. The groups of single raising proved to have better loin eye area and thickness of back fat among other findings of carcass, and, as the number of the raised animals incresed in the groups, the fat layer tended to be thicker and more variable in the results, showing somewhat inferior quality of carcass.
- 日本養豚学会の論文
日本養豚学会 | 論文
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