Effects of unused parts of sweet potato as supplemental feed on the growth situation, meat productivity and meat quality of pigs

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  • 肉用豚の産肉性および肉質に及ぼすカンショ茎葉添加飼料給与の影響
  • ニクヨウ ブタ ノ サンニクセイ オヨビ ニクシツ ニ オヨボス カンショ ケイヨウ テンカ シリョウ キュウヨ ノ エイキョウ

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Abstract

Generally in the southern part of Japan, Kyushu Island, after harvesting sweet potato roots, the leaves and stems are discarded. Therefore, the purpose of this study was to utilize the leaves and stems of sweet potato as functional forage for pigs. This study investigated the effects of these unused parts on the growth, meat productivity and meat quality of pigs. Meat quality in this context included lipid content, vitamin E content and fatty acid compositions etc. Pigs subjected to this treatment were of a new generation from ternary cross- breeding (Large White×Landrace×Duroc). The pigs were divided into two groups based on diet. The control group was fed an ordinary diet, while the other group was fed an ordinary diet with 5% unused parts of sweet potato. The forage was given to pigs weighing 30 kg and the feeding diet was completed when the pigs reached 110 kg. We examined the growth of these pigs (including fattening days, feed intake, feed demand rate, etc.) and meat productivity (daily weight gain, back fat thickness), as well as meat quality (lipid content, vitamin E content, fatty acid compositions). Extra examinations were conducted on the internal organs to determine the pigs’ health condition. The pigs found the supplemented diet highly palatable. As a result, this diet positively affected the growth of pigs. The appearance of the pigs’ internal organs was slightly better than those of the pigs fed with the ordinary diet. On the other hand, the lipid content in the loins increased in the experimental group though insignificantly, while the vitamin E content in the inner layer of subcutaneous fat increased significantly. However, the increase of vitamin E in the loins was insignificant. The fatty acid compositions remained at a normal level. The feasibility of utilizing the unused parts of sweet potato as forage to pigs generated from ternary cross breeding was confirmed. This is the first report on the utilization of the unused part of sweet potato as forage therefore we believe that this study is beneficial for any further studies on this topic.

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