Effect of liquid straight whey feeding on reproductive performance, productivity and carcass characteristics of pigs in a commercial pig farm

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  • 豚生産農場における液状ストレートホエイ給与が繁殖性，生産性および枝肉形質に及ぼす影響
  • ブタ セイサン ノウジョウ ニ オケル エキジョウ ストレートホエイ キュウヨ ガ ハンショクセイ セイサンセイ オヨビ エダニク ケイシツ ニ オヨボス エイキョウ

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An enormous amount of whey is discharged from daily factories, and farms in which pigs are fed with whey are increasing because of its high protein content and nutritive value. However, effects of whey feeding have not been fully investigated. In the present study, we investigated the reproductive performance, the productivity and the carcass characteristics of pigs fed with commercial formula feed supplemented with liquid straight whey. Sows were fed with three to five L of liquid straight whey per day per head. Litter size, rate of return to estrus within seven days and conception rate of whey-fed sows were significantly higher than those of control sows : they improved by 0.2 heads (P < 0.001), 3.2% (P < 0.05) and 3.4% (P < 0.001), respectively, in whey-fed sows. One point three to 1.5 L per day per head of liquid straight whey was fed to fattening pigs. Shipping age of whey-fed pigs was significantly younger than that of control pigs (3.4 days, P < 0.05). Significant differences in the carcass characteristics between whey-fed and control pigs were not observed. Meanwhile, when 0.2 L per day per head of liquid straight whey was fed to pigs only in the weaning period, shipping age and daily gain were not improved in whey-fed pigs. Significant differences in the carcass characteristics were not observed either. These results showed that liquid straight whey feeding is effective in improving the reproductive performance of sows in a commercial pig farm. Improvement of productivity was also observed when whey was fed to fattening pigs.

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