An eight year study was conducted to determine the effects of three different rearing environments on growth performance of growing and finishing pigs (from 28 to 107 kg avg. body wt.) reared during the summer or winter in the southeastern USA (31° Nlatitude). The three rearing environments were 1) concrete-floored pens in a semi-confinement building or outside dirt lot pens with minimal shelter that 2) have ("old") or 3) have not ("new") been occupied previously by pigs. Two trials were conductedeach year (summer and winter) and each involved 36 crossbred pigs. All pigs were routinely dewormed. Overall, pigs reared during the summer on average grew 3% slower (0.83 vs. 0.86 kg/d; P<0.001) but required 3% less feed (3.32 vs. 3.41 kg; PO.001) per kg of weight gain than pigs raised during the winter. Rearing environment influenced average daily gain (P<0.001; 0.82, 0.85, and 0.86 kg/d for "old", "new" and concrete pens, respectively) and feed/gain (PO.001; 3.48, 3.35, and 3.26); a pen x season interaction (PO.01) was noted for feed/gain. Average backfat thickness was influenced by rearing environment (P = 0.01) and somewhat by season (P = 0.08). Growing-finishing pigs can be effectively reared in outside dirt lots under the environmental conditions of the southeastern USA, in particular if the lots arc periodically rotated to "new" ground.
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机译：进行了八年的研究，以确定三种不同饲养环境对生长和整理猪生长性能的影响（28至107公斤AVG。身体重量）在美国东南部的夏季或冬季饲养（31°Nltate） 。三个饲养环境为1）混凝土地板笔在半监禁建筑物或污垢批次，其中2）的最小避难所（“旧”）或3）没有（“新”）以前被猪占用。两项试验是进行的一年（夏季和冬季），每个涉及36只杂种猪。所有猪都经常被驱逐出来。总体而言，夏季饲养的猪平均增长3％（0.83×0.86kg / d; P <0.001），但需要3％的饲料（3.32与3.41千克; PO.001），每千克重量增长在冬天举起。饲养环境影响平均每日增益（P <0.001; 0.82,0.85和0.86 kg / d，分别为“旧”，“新”和混凝土笔）和进料/增益（PO.001; 3.48,3.35和3.26） ;注明饲料/收益的笔X季节相互作用（PO.01）。平均背脂厚度受饲养环境的影响（P = 0.01），稍微季节（P = 0.08）。在美国东南部的环境条件下，可以有效地饲养生长的猪，特别是如果批次弧定期旋转到“新”地面。
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