We hypothesized that the digestibility of a zinc polysaccharide complex is greater than zinc sulfate when sows consume high fiber diets containing corn dried distillers grains with solubles (DDGS). Gilts and sows (n = 32) were blocked according to parity and assigned randomly to one of four dietary treatments (n = 8 sows per treatments). Dietary treatments consisted of: 1) Control (ConZnSO4)-corn-soybean meal-based diet + 100 ppm supplemental Zn from ZnSO4; 2) Control PSZn (ConPSZn)-corn-soybean meal-based diet + 100 ppm supplemental Zn from Zn polysaccharide complex; 3) DDGS/ZnSO4-corn-soybean meal-40% DDGS gestation diet and a 30% DDGS lactation diet, with each containing 100 ppm supplemental Zn from ZnSO4; 4) DDGS/PSZn-corn-soybean meal-40% DDGS gestation diet and a 30% DDGS lactation diet, with each containing 100 ppm supplemental Zn from Zn polysaccharide complex. A fifth dietary treatment was imposed using a subset of sows (n = 20) to determine basal Zn losses in gestating and lactating sows fed corn-soybean meal-based diets containing no supplemental Zn. Nutrient balance experiments were conducted in both gestation and lactation to evaluate the digestibility of Zn sources of the four dietary treatments and to determine basal Zn losses when no supplemental Zn was provided. The statistical model included fixed effects of diet, Zn source, and their interaction, and random effects of parity. Estimated endogenous losses of Zn were used to adjust apparent total tract digestibility (ATTD) to true total tract digestibility (TTTD) of Zn in the four dietary treatment balance periods. There were no differences in Zn concentrations of urine, plasma, colostrum, or milk samples among treatments at any time of the experiment (P > 0.05). Gestating sows fed DDGS/PSZn had improved (P < 0.05) ATTD, TTTD, and overall retention of Zn compared with both Control treatments, with the DDGS/ZnSO4 treatment responses being intermediate. Lactating sows consuming diets without DDGS and supplemented with Zn polysaccharide complex had the greatest (P < 0.05) ATTD, TTTD, and retention of Zn, which were opposite to responses observed in gestation. Furthermore, ATTD, TTTD, and Zn retention for lactating sows consuming DDGS/PSZn were less (P < 0.05) than all other treatments. Overall, zinc digestibility of ZnSO4 and PSZn appears to be differentially influenced by the stage of the reproductive cycle and presence of dietary fiber from DDGS.

中文翻译：

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妊娠期和哺乳期母猪日粮中多糖复合锌和硫酸锌消化率的比较。


我们假设，当母猪食用含有可溶物玉米干酒糟 (DDGS) 的高纤维日粮时，锌多糖复合物的消化率高于硫酸锌。根据胎次对后备母猪和母猪 (n = 32) 进行分组，并随机分配到四种日粮处理中的一种（每个处理 n = 8 头母猪）。饮食治疗包括： 1) 对照 (ConZnSO4) - 以玉米-豆粕为主的饮食 + 100 ppm 补充 ZnSO4 中的锌； 2)控制PSZn(ConPSZn)-玉米-豆粕为主的饮食+来自锌多糖复合物的100 ppm补充锌； 3) DDGS/ZnSO4-玉米-豆粕-40%DDGS妊娠期日粮和30%DDGS哺乳期日粮，各含有100ppm的ZnSO4补充锌； 4) DDGS/PSZn-玉米-豆粕-40% DDGS 妊娠期饮食和 30% DDGS 哺乳期饮食，每种都含有来自锌多糖复合物的 100 ppm 补充锌。使用一部分母猪（n = 20）进行第五种饮食治疗，以确定饲喂不含补充锌的玉米豆粕日粮的妊娠期和哺乳期母猪的基础锌损失。在妊娠期和哺乳期进行营养平衡实验，以评估四种饮食处理中锌源的消化率，并确定不补充锌时的基础锌损失。统计模型包括饮食、锌源及其相互作用的固定效应，以及胎次的随机效应。估计的锌内源损失用于将四个饮食处理平衡期中锌的表观总消化道消化率（ATTD）调整为锌的真实总消化道消化率（TTTD）。在实验的任何时间，不同处理之间的尿液、血浆、初乳或牛奶样品中的锌浓度没有差异（P > 0.05）。 与两种对照处理相比，饲喂 DDGS/PSZn 的妊娠母猪的 ATTD、TTTD 和总体锌保留率有所改善 (P < 0.05)，其中 DDGS/ZnSO4 处理反应处于中等水平。食用不含 DDGS 并补充锌多糖复合物的日粮的哺乳母猪具有最大 (P < 0.05) ATTD、TTTD 和锌保留率，这与妊娠期观察到的反应相反。此外，食用 DDGS/PSZn 的哺乳母猪的 ATTD、TTTD 和 Zn 保留率低于所有其他处理（P < 0.05）。总体而言，ZnSO4 和 PSZn 的锌消化率似乎受到生殖周期阶段和 DDGS 膳食纤维存在的不同影响。