This study investigated the effects of dietary supplementation with chestnut tannins (CNT) on metabolic and antioxidant status of prepartum cows along with their colostrum quality. Pregnant multiparous Holstein cows were paired according to parity and body condition score, and assigned either to a diet supplemented with 20 g/d of commercially available product containing chestnut tannins (CNT, n=20) or to an unsupplemented control diet (CON, n=20) for the last 25±2 d of pregnancy. Serum metabolite, insulin and antioxidant capacity indices were measured in blood samples taken at d 25 and d 5 before expected parturition. Chemical composition and IgG concentration were determined in colostrum samples collected from the first milking postpartum. The addition of CNT led to lower BUN (P=0.02) and consequently higher serum glucose (P=0.02) and insulin (P<0.01) concentrations which were associated with lower circulating NEFA (P<0.01) and BHBA (P<0.01) in CNT group than those of CON. The serum paraoxonase 1 (PON 1) activity and total antioxidant capacity (TAOC) were higher at -5 d in CNT than in CON (P<0.01, P=0.03; respectively). Close-up CNT improved lactose percentage and IgG concentration (P=0.03, P=0.04; respectively) and tended to improve percentage of protein and SNF (Solid Not Fat) in primary colostrum (P=0.06, respectively), without affecting colostrum fat and total solid (P=0.98, P=0.43; respectively). Supplementation of CNT in the diet during close-up period did not have adverse effects on metabolic profiles prepartum. Instead, this feeding regimen was more beneficial to antioxidant capacity and colostrum quality than feeding the control diet.

中文翻译：

---

栗子单宁补充产前中等产量奶牛对代谢健康，抗氧化和初乳指标的影响

这项研究调查了膳食中添加栗单宁（CNT）对产前母牛的代谢和抗氧化状态以及初乳质量的影响。根据胎次和身体状况评分对多头荷斯坦牛进行配对，并分配到补充有20 g / d含栗单宁（CNT，n = 20）的市售产品的日粮或未补充对照日粮（CON，n = 20）的最后25±2天。在预期分娩前第25天和第5天采集的血液样本中测量血清代谢产物，胰岛素和抗氧化能力指数。确定从第一次挤奶产后收集的初乳样品中的化学成分和IgG浓度。CNT的添加导致较低的BUN（P = 0.02），因此导致较高的血清葡萄糖（P = 0。02）和胰岛素（P <0.01）浓度与CNT组的循环NEFA（P <0.01）和BHBA（P <0.01）较CON组低有关。在-5 d时，CNT中的血清对氧磷酶1（PON 1）活性和总抗氧化能力（TAOC）高于CON（P <0.01，P = 0.03；）。特写CNT可以改善乳糖含量和IgG浓度（分别为P = 0.03，P = 0.04；），并倾向于提高原初乳中蛋白质和SNF（固态非脂肪）的百分比（分别为P = 0.06），而不会影响初乳脂肪和总固体（分别为P = 0.98，P = 0.43）。在特写期间在饮食中补充CNT对产前代谢状况没有不利影响。取而代之的是，这种饲喂方案比饲喂对照饮食对抗氧化能力和初乳质量更有益。01）与CNT组的循环NEFA（P <0.01）和BHBA（P <0.01）较低的浓度相关。在-5 d时，CNT中的血清对氧磷酶1（PON 1）活性和总抗氧化能力（TAOC）高于CON（P <0.01，P = 0.03；）。特写CNT可以改善乳糖含量和IgG浓度（分别为P = 0.03，P = 0.04；），并倾向于提高原初乳中蛋白质和SNF（固态非脂肪）的百分比（分别为P = 0.06），而不会影响初乳脂肪和总固体（分别为P = 0.98，P = 0.43）。在特写期间在饮食中补充CNT对产前代谢状况没有不利影响。相反，这种饲喂方案比饲喂对照饮食对抗氧化能力和初乳品质更有益。01）与CNT组的循环NEFA（P <0.01）和BHBA（P <0.01）较低的浓度相关。在-5 d时，CNT中的血清对氧磷酶1（PON 1）活性和总抗氧化能力（TAOC）高于CON（P <0.01，P = 0.03；）。特写CNT改善了初乳中的乳糖百分比和IgG浓度（分别为P = 0.03，P = 0.04）和趋于提高蛋白质和SNF（固态非脂肪）的百分比（分别为P = 0.06），而不会影响初乳脂肪和总固体（分别为P = 0.98，P = 0.43）。在特写期间在饮食中补充CNT对产前代谢状况没有不利影响。相反，这种饲喂方案比饲喂对照饮食对抗氧化能力和初乳品质更有益。