THE DIGESTIBILITY OF RATION NUTRIENTS BY 3-WEEK VS 7-WEEK OLD PIGS
THE DIGESTIBILITY OF RATION NUTRIENTS BY 3-WEEK VS 7-WEEK OLD PIGS
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DOI：
10.2527/jas1957.162383x
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发表时间：
1957-01-01
影响因子：
3.3
通讯作者：
MACKAY, VG
中科院分区：
文献类型：
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作者：
LLOYD, LE;CRAMPTON, EW;MACKAY, VG
试验选用32头2周龄断奶猪，饲喂干性早断奶日粮6周。3、7周龄时，采用氧化铬法测定每组4头猪日粮营养物质的表观消化率。7周龄猪的平均消化系数较高，包括干物质、总能量、粗蛋白质、粗脂肪和总碳水化合物。乙醚提取部位差异最大，变异性最大。因此，选用80头2周龄断奶仔猪饲喂饲粮，饲粮中添加13种不同脂肪或油，添加量为20%。测定日粮营养物质的表观消化率。同样，对于相同的营养物质，年龄较大的猪的平均消化系数更高，并且在粗脂肪消化率的情况下出现了最显著的差异。随着脂肪或油中脂肪酸平均分子量的增加，油脂提取物的表观消化率逐渐降低。这种下降在三周龄猪的情况下更为明显。这些结果表明，在8周龄之前，仔猪的消化能力发生了显著变化，特别是脂肪的消化率。
Thirty-two pigs, weaned at 2 weeks of age, were fed a dry early-weaning ration for 6 weeks. Upon reaching 3 and 7 weeks of age, the apparent digestibility of the ration nutrients was determined for each group of 4 pigs by the chromic oxide method. Average digestion coefficients for the seven-week old pigs were higher for all nutrients studied - dry matter, total energy, crude protein, ether extract, and total carbohydrate. The greatest difference and the highest variability was noted for the ether extract fraction. Therefore, 80 pigs, weaned at 2 weeks of age, were fed the same ration to which 13 different fats or oils were added at the 20% level. Apparent digestibility of ration nutrients was determined as before. Once again, average digestion coefficients for the older pigs were higher for the same nutrients, and the most pronounced differences occurred in the case of ether extract digestibility. There was a progressive decrease in apparent digestibility of ether extract when the mean molecular weight of the fatty acids in the fats or oils increased. This decrease was accentuated in the case of the three-week old pigs. These results indicate that there is a marked change in the digestive ability of the young pig prior to 8 weeks of age, particularly with reference to the digestibility of fat.