首页> 外文期刊>New Zealand Veterinary Journal >Effect of diets containing sulfate or chloride-based anionic salts, fed to grazing prepartum dairy cows, on concentrations of Ca in plasma, disease incidence and milk yield
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Effect of diets containing sulfate or chloride-based anionic salts, fed to grazing prepartum dairy cows, on concentrations of Ca in plasma, disease incidence and milk yield

机译:含硫酸盐或氯化物的阴离子盐的饮食效果,进料到放牧奶牛,对血浆,疾病发病率和牛奶产量的浓度

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AIMS: To compare the effect of two partial mixed ration diets containing either sulfate or chloride-based anionic salts, fed to grazing prepartum dairy cows, on concentrations of Ca, Mg, P and beta-hydroxybutyrate (BHB) in plasma, disease incidence and milk yield during the early postpartum period. METHODS: The study was conducted on a seasonal-calving grazing dairy farm located in Benton (MO, USA). In August 2016, two groups of 200 cows were randomly assigned at 30 days before expected parturition to receive either a sulfate or chloride-based anionic diet, to achieve a dietary cation-anion difference (DCAD) of -25 mEq/kg DM. Cows were fed partial mixed rations to provide 50% of their DM intake, with 50% provided by grazing fescue pasture. Urine samples were collected from 20 cows from each group once a week for 5 weeks until calving for pH assessment. At parturition, 42 cows per group were selected at random and blood samples collected on Days 1, 2, 3 and 7 postpartum. The study continued until 100 cows per group calved. Health events and cumulative milk yield until 30 days postpartum were recorded. Concentrations of Ca, P, and Mg in plasma at Days 1, 2, 3, and 7, and BHB in plasma at Day 7 postpartum were assessed. RESULTS: Mean urine pH was lower in cows in the chloride than sulfate group (p = 0.06) on four of five sampling occasions. Mean concentrations of Ca in plasma on Day 1 were 2.00 (95% CI=1.94-2.05) and 1.91 (95% CI=1.88-1.97) mmol/L for the chloride and sulfate groups, respectively (p=0.15), and on Day 3 were 2.03 (95% CI=1.97-2.08) and 1.90 (95% CI=1.84-1.96) mmol/L, respectively (p=0.038). Concentrations of Mg, P and BHB in plasma and incidence of diseases postpartum were similar in both groups (p0.05). There were no cases of clinical hypocalcaemia in either group. CONCLUSIONS AND CLINICAL RELEVANCE: Prepartum cows fed a partial mixed ration with a negative DCAD containing chloride-based anionic salts and free access to a fescue pasture had lower prepartum urine pH, and higher concentrations of total Ca in plasma during the first week postpartum, than cows receiving a partial mixed ration containing sulfate-based anionic salts.
机译:旨在比较含有硫酸盐或氯化物的阴离子盐的两种部分混合饮食的效果,进料到放牧奶牛,血浆,疾病发病率的Ca,Mg,P和β-羟基丁酸酯(BHB)的浓度。产后早期的牛奶产量。方法:该研究在位于宾顿(Mo,USA)的季节性牧场奶牛场进行。 2016年8月,预期分娩前30天在预期的两年内随机分配两组,以获得硫酸盐或基于氯化物的阴离子饮食,以达到-25meq / kg DM的膳食阳离子差(DCAD)。奶牛被喂养部分混合口粮,以提供50%的DM摄入量,通过放牧菲舍斯牧场提供了50%。每周从每组的20次母牛收集尿液样品5周,直至犊牛评估为pH值。在分娩时,每组42个牛在第1,2,3和7天收集的血液样本中选择,血液样本。该研究持续到每组100艘母线。恢复健康事件和累积牛奶产量直到产后30天。评估在第7天的血浆中Ca,P和Mg的浓度,并在第7天产后的血浆中的BHB进行评估。结果:在五种采样场合中的四个中,氯化物中母牛的奶牛在牛的平均尿液pH值低于硫酸盐。在第1天的血浆中Ca的平均浓度分别为2.00(95%CI = 1.94-2.05)和1.91(95%CI = 1.88-1.97)mmol / L用于氯化物和硫酸盐基团(p = 0.15),并开启第3天分别为2.03(95%CI = 1.97-2.08)和1.90(95%CI = 1.84-1.96)mmol / L(P = 0.038)。血浆中Mg,P和BHB的浓度和产后的疾病发生率在两组中相似(P> 0.05)。两组中没有临床低钙血症病例。结论和临床相关性:喂养含有含有氯化物的阴离子盐的阴性DCAD的部分混合配对,并且在产后的前一周内具有较低的尿液pH预备尿pH,并且在血浆中具有较高的尿液pH,比接受含有基于硫酸盐的阴离子盐的部分混合配给的母牛。

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