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    降低日粮阳离子-阴离子差值增加母猪血液和乳汁中钙的浓度

    发布单位:和记国际_和记app_和记国际

    查看次数:401

    时间:2019-05-07


    J Y Guo,T J Pasquetti,S W Kim

    翻译:刘素利    



    本研究旨在评估饲喂降低阳离子-阴离子差值(DCAD)引起的酸化日粮对泌乳期母猪酸碱平衡、血液和乳汁及尿液钙浓度的影响。试验选用30头经产母猪(胎次:4.5±2.9)随机分为两组,CON组(对照组,玉米-豆粕型日粮,在妊娠后期和泌乳期DCAD值分别为170和226 mEq/kg)和ACI组(酸化日粮,比对照组DCAD值低100 mEq /kg);低DCAD日粮是通过添加酸化矿物质获得的,DCAD值是作为mEq(Na + K – Cl)日粮计算的。在母猪妊娠94d到分娩阶段每天饲喂2kg饲粮,泌乳期自由采食。检测母猪血液和尿液中pH和钙、血清常量矿物质和生化指标、钙调节激素类以及乳汁组成成分。

         
    试验数据显示,与CON组比较:在泌乳1天,ACI组母猪血液pH显著降低(P < 0.05);在妊娠108天,泌乳1天、9天和18天,ACI组母猪尿液pH显著降低(P < 0.05);在泌乳1和18天,ACI组母猪血清总钙浓度显著升高(P < 0.05);ACI组母猪初乳中钙浓度显著升高(P < 0.05)。泌乳期两组间尿钙浓度无显著差异,在泌乳1和18天时,甲状旁腺素和1,25-二羟胆钙化醇浓度无显著差异;泌乳18天时,两组血清中碱性磷酸酶浓度相似(P = 0.086)。在泌乳1天时,ACI组母猪血清中Cl浓度显著升高(P < 0.05)。两组间母猪采食量、体重损失和产仔性能无差异。


          总体而言,饲喂母猪低DCAD酸化日粮在分娩时能够引起轻微的代谢性酸中毒,减少了尿液pH值,增加了泌乳期血清总钙和初乳中钙浓度,但是没有改变母猪泌乳期甲状旁腺素和1,25-二羟胆钙化醇水平 。



    Lowering dietary cation-anion difference increases sow blood and milk calcium concentrations


    A study was conducted to evaluate the effects of feeding an acidogenic diet with a low dietary cation-anion difference (DCAD) on acid-base balance, blood, milk and urine Ca concentrations of sows during lactation. A total of 30 multiparous sows (parity: 4.5 ± 2.9, Smithfield Premium Genetic, Rose Hill, NC) were allotted to one of two dietary treatments: CON (control diets were corn-soybean meal based with a calculated DCAD of 170 and 226 mEq/kg during late gestation and lactation, respectively) or ACI (acidogenic diets had a DCAD 100 mEq/kg lower than the control diets). The lower DCAD was achieved by the addition of an acidogenic mineral. The DCAD was calculated as mEq (Na + K – Cl)/kg diet. Sows had a daily access to 2 kg feed from d 94 of gestation to parturition and ad libitum access to feed during lactation. Blood and urine pH and Ca, serum macrominerals, serum biochemistry, Ca-regulating hormones, and milk composition were measured. Sows in ACI had a lower (P < 0.05) blood pH than sows in CON at d 1 of lactation. Sows in ACI had a lower (P < 0.05) urine pH at d 108 of gestation, d 1, 9, and 18 of lactation compared with sows in CON. Sows in ACI had greater (P < 0.05) concentrations of serum total Ca at d 1 and 18 of lactation than sows in CON. There was a greater (P < 0.05) concentration of colostrum Ca in ACI than in CON. There was no difference in urine Ca concentration between treatments during lactation. Concentrations of parathyroid hormone and 1,25-dihydroxycholecalciferol were not different between treatments at either d 1 or 18 of lactation. Sows in ACI tended to have a smaller (P = 0.086) concentration of total alkaline phosphatase in serum at d 18 of lactation compared with sows in CON. At d 1 of lactation, the concentration of serum Cl in ACI was greater (P < 0.05) than that in CON. Feed intake, BW loss, and litter performance were not different between treatments. Collectively, feeding an acidogenic diet with a low DCAD to sows can induce a mild metabolic acidosis at farrowing, reduce the urine pH consistently, and increase serum total Ca and colostrum Ca concentrations during lactation but without altering the parathyroid hormone and 1,25-dihydroxycholecalciferol levels during lactation.


          转自公众号:猪营养国际论坛


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