Hou W X, Cheng S Y, Liu S T, Shi B M, Shan A S
Asian-Australas J Anim Sci. 2014 Oct;27(10):1469-77. doi: 10.5713/ajas.2014.14190.
This experiment was conducted to investigate the effects of dietary supplementation of magnesium sulfate (MgSO4) during late gestation and lactation on sow and litter performance, fecal moisture, blood biochemistry parameters, immunoglobulin levels and milk composition in sows. Forty-eight sows (Yorkshire×Landrace, 4th to 5th parity) were randomly allocated to 1 of 4 dietary treatments supplemented with 0, 200, 400, or 600 mg/kg MgSO4 (n = 12). The experiment started on day 90 of gestation and continued through day 21 of lactation. Blood samples were collected on day 107 of gestation, day 0 (farrowing) and 21 (weaning) of lactation for the analyses of the blood biochemistry parameters and immunoglobulin levels. The colostrum and milk samples were obtained on day 0 and 14 of lactation, respectively. Fecal samples were collected from the sows on day 107 of gestation as well as day 7 and 20 of lactation to determine fecal moisture content. The results showed that the survival percentage of piglets and the litter weight at weaning were decreased linearly (p<0.05) and other parameters of the sow or litter performance were not influenced (p>0.05) by MgSO4 supplementation. The fecal moisture content of the sows were increased (p<0.05) linearly as dietary MgSO4 increased on day 7 and 20 of lactation. Supplementation with MgSO4 increased the plasma magnesium (Mg) level linearly (p<0.05) and had a trend to increase total protein level (p>0.05 and p<0.10). However, an increase in the dietary MgSO4 level resulted in a linear decrease in the colostrum fat content (p<0.05). Dietary MgSO4 supplementation enhanced the immunoglobulin G (IgG) level (linear, p<0.05) in plasma on day of farrowing and immunoglobulin A (IgA) level in colostrum (quadratic, p<0.05) and milk (linear, p<0.05) of the sows. These results indicated that supplementation with MgSO4 during late gestation and lactation may have the potential to prevent sow constipation, but may also result in some negative effects.
本试验旨在研究妊娠后期和哺乳期日粮添加硫酸镁（MgSO4）对母猪及其仔猪生产性能、粪便水分、血液生化参数、免疫球蛋白水平和母猪乳汁成分的影响。选用48头（大白×长白，第4至第5胎）经产母猪，随机分为4组，分别在日粮中添加0、200、400或600 mg/kg MgSO4（每组12头）。试验从妊娠第90天开始，持续至哺乳期第21天。在妊娠第107天、泌乳第0天（分娩）和第21天（断奶）采集血样，用于分析血液生化参数和免疫球蛋白水平。分别在泌乳第0天和第14天采集初乳和乳汁样本。在妊娠第107天以及泌乳第7天和第20天采集母猪粪便样本，以测定粪便水分含量。结果表明，添加MgSO4使仔猪成活率和断奶窝重呈线性下降（p<0.05），而对母猪或仔猪的其他生产性能参数无影响（p>0.05）。在泌乳第7天和第20天，随着日粮中MgSO4添加量的增加，母猪粪便水分含量呈线性增加（p<0.05）。添加MgSO4使血浆镁（Mg）水平呈线性增加（p<0.05），且有使总蛋白水平升高的趋势（p>0.05和p<0.10）。然而，日粮中MgSO4水平的升高导致初乳脂肪含量呈线性下降（p<0.05）。日粮添加MgSO4提高了分娩当天血浆中免疫球蛋白G（IgG）水平（线性，p<0.05）以及初乳（二次曲线，p<><><0="">。这些结果表明，妊娠后期和哺乳期添加MgSO4可能有预防母猪便秘的潜力，但也可能产生一些负面影响。
