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    妊娠日粮中蛋氨酸/赖氨酸比值对母猪胎盘血管生成及繁殖性能的影响

    发布单位:yabo亚博体育-官网

    查看次数:396

    时间:2019-06-10
    M Xia,Y Pan,L L Guo,X X Wei,J Xiong,L Wang,J Peng,C Wang,J Peng,H K Wei
    翻译:刘素利     校对:上海亘泰实业集团

           本研究旨在评价妊娠日粮中不同的蛋氨酸/赖氨酸(Met/Lys)比值对母猪生产性能的影响,特别是,检测蛋氨酸对妊娠母猪血浆尿素、氨基酸浓度及胎盘血管密度的影响。试验选用325头多胎母猪(3胎,大白)为试验对象,随机分到5个日粮处理组中(n = 65),5个日粮组中Met/Lys比值分别为0.27 (NRC 2012水平)、0.32、0.37、0.42、0.47;测量和记录出生时的产仔数和体重,分别于妊娠第0d、40d、90d、114d采血,分娩时采集胎盘样本。根据母猪的产仔数(以≥13头为高产,<13头为低产作为判别标准),评估日粮中不同的Met/Lys水平对母猪繁殖性能的影响。

           结果表明,饲粮中Met/Lys比值对低产母猪繁殖性能无显著影响(P > 0.05)。而对于高产母猪,与对照组比较,0.37 Met/Lys日粮组猪只出生活仔窝重显著提高(P < 0.05)。不同日粮处理组之间,出生窝重和出生体重< 0.9 kg仔猪百分比呈显著的二次方程式关系(P < 0.05);此外,0.37 Met/Lys日粮组母猪的繁殖性能是最佳的;母猪血浆尿素浓度也随日粮中Met/Lys比值的平方而改变(P < 0.05);随着日粮中Met/Lys比值的增加血浆中大部分氨基酸的浓度也提高了;虽然日粮中Met/Lys比值对胎盘血管密度影响不显著(P > 0.05),但日粮Met/Lys比值对胎盘血管密度有显著的二次效应(P < 0.05)。此外,高产母猪仔猪出生重与胎盘血管密度呈显著正相关(P < 0.01)。

           总体来说,日粮Met/Lys比值与仔猪出生重、胎盘血管生成性能呈二次曲线关系,其中0.37Met/Lys日粮组对高产母猪的生产性能贡献最大。


           Effect of gestation dietary methionine/lysine ratio on placental angiogenesis and reproductive performance of sows

           The current study aims to evaluate the effects of different gestation dietary Met/Lys (methionine/lysine) ratios on the production performance of sows. Specifically, it measured the effect of methionine on plasma urea and amino acid concentrations and placental vascular density of pregnant sows. A total of 325 multiparous sows (3rd parity, Large White) were randomly allocated to 5 dietary treatments (n = 65) with 5 dietary Met/Lys ratios 0.27 (NRC 2012 level), 0.32, 0.37, 0.42, 0.47). The litter size and weight at birth were measured and recorded. Blood samples were obtained on day 0, day 40, day 90, and day 114 of gestation and placenta samples were collected at parturition. The effects of different dietary Met/Lys ratios on the reproductive performance were evaluated based on the prolificacy of sows as either high (≥ 13 total piglets born) or low (< 13 total piglets born). The results showed that dietary Met/Lys ratio had no significant effect on the reproductive performance of lower prolificacy sows (P > 0.05). However, for high-prolificacy sows, litter weight of born alive significantly increased in 0.37 Met/Lys ratios group compared to control group (P < 0.05). The gestation dietary Met/Lys ratio showed significant quadratic effects on the litter birth weight and percentage of piglets born with weight < 0.9 kg (P < 0.05), and the Met/Lys ratios to achieve the best reproductive performance determined to be 0.37. Furthermore, plasma urea concentrations of sows also changed with Met/Lys ratios quadratically (P < 0.05). Increasing dietary Met/Lys ratios elevated the concentration of most plasma amino acid. Although the dietary Met/Lys ratio had no significant effect on the placental vascular density (P > 0.05), the gestation dietary Met/Lys ratio showed significant quadratic effects on the the placental vascular density (P < 0.05). In addition, the birth weight of piglets of high-prolificacy sows was positively correlated with the placental vascular density (P < 0.01). Taken as a whole, the dietary Met/Lys ratio showed a quadratic curve relation with birth weight performance and placental angiogenesis performance, to which 0.37 ratio contributed to the best performance of high-prolificacy sows.转自:猪营养国际论坛


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