Qi K, Lu C D, Owens F N
Agriculture Research and Extension Programs, Langston University, OK 73050.
J Anim Sci. 1992 Nov;70(11):3541-50. doi: 10.2527/1992.70113541x.
Effects of sulfate supplementation on milk yield and composition, ruminal and blood metabolites, acid-base status, and nutrient digestibilities were determined using 30 multiparous, lactating Alpine does. Goats were fed isonitrogenous diets containing .16 (basal), .26, or .36% S (DM basis) during a 13-wk lactation trial that coincided with wk 3 to 15 of lactation. During wk 16 to 17, four does from each treatment were placed in a metabolism crate to measure nutrient digestibility and balance. Feed intake, yield of 4% fat-corrected milk, and milk S content were not affected by added S, but the goats fed the .26% S diet had a trend of higher persistency of lactation (P < .20). During wk 10 and 15 of lactation, milk solids-not-fat percentage was higher (P < .10) for does fed the .26% S diet. Sulfur supplementation resulted in quadratic decreases in ruminal ammonia N (P < .05) in wk 15 and in plasma urea N in wk 10 and 15 (P < .05) but in linear increases (P < .05) in ruminal protein S concentrations throughout the experiment. Added S had little effect on blood acid-base status. Apparent digestibilities of DM, OM, ash, ADF, and GE were increased linearly (P < .10) by added S. The milk N:S ratio remained constant. Increasing S from .16 to .26% of diet DM was beneficial to lactating Alpine goats during early lactation.
使用30只经产泌乳期阿尔卑斯奶山羊，测定了添加硫酸盐对产奶量、奶成分、瘤胃和血液代谢物、酸碱平衡状态以及养分消化率的影响。在为期13周的泌乳试验期间（与泌乳第3至15周一致），给山羊饲喂含硫量分别为0.16%（基础日粮）、0.26%或0.36%（干物质基础）的等氮日粮。在第16至17周，从每种处理中选取4只奶山羊放入代谢笼中，以测定养分消化率和平衡情况。添加硫对采食量、4%脂肪校正奶产量和奶中硫含量没有影响，但饲喂0.26%硫日粮的奶山羊泌乳持续性有升高趋势（P<0.20）。在泌乳第10周和第15周，饲喂0.26%硫日粮的奶山羊非脂乳固体百分比更高（P<0.10）。添加硫导致第15周瘤胃氨氮呈二次方下降（P<0.05），第10周和第15周血浆尿素氮下降（P<0.05），但在整个实验过程中瘤胃蛋白硫浓度呈线性增加（P<0.05）。添加硫对血液酸碱平衡状态影响不大。添加硫使干物质、有机物、灰分、酸性洗涤纤维和总能的表观消化率呈线性增加（P<0.10）。奶中氮硫比保持不变。将日粮干物质中硫含量从0.16%提高到0.26%对泌乳早期的阿尔卑斯奶山羊有益。
