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妊娠日糧中蛋氨酸/賴氨酸比值對母豬胎盤血管生成及繁殖性能的影響

發(fā)布單位:天津瑞孚農(nóng)牧科技集團有限公司

查看次數(shù)：8354

時間：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
翻譯：劉素利     校對：上海亙泰實業(yè)集團

       本研究旨在評價妊娠日糧中不同的蛋氨酸/賴氨酸（Met/Lys）比值對母豬生產(chǎn)性能的影響，特別是，檢測蛋氨酸對妊娠母豬血漿尿素、氨基酸濃度及胎盤血管密度的影響。試驗選用325頭多胎母豬（3胎，大白）為試驗對象，隨機分到5個日糧處理組中（n = 65），5個日糧組中Met/Lys比值分別為0.27 （NRC 2012水平）、0.32、0.37、0.42、0.47；測量和記錄出生時的產(chǎn)仔數(shù)和體重，分別于妊娠第0d、40d、90d、114d采血，分娩時采集胎盤樣本。根據(jù)母豬的產(chǎn)仔數(shù)（以≥13頭為高產(chǎn)，＜13頭為低產(chǎn)作為判別標準），評估日糧中不同的Met/Lys水平對母豬繁殖性能的影響。

       結(jié)果表明，飼糧中Met/Lys比值對低產(chǎn)母豬繁殖性能無顯著影響（P > 0.05）。而對于高產(chǎn)母豬，與對照組比較，0.37 Met/Lys日糧組豬只出生活仔窩重顯著提高（P < 0.05）。不同日糧處理組之間，出生窩重和出生體重< 0.9 kg仔豬百分比呈顯著的二次方程式關(guān)系（P < 0.05）；此外，0.37 Met/Lys日糧組母豬的繁殖性能是最佳的；母豬血漿尿素濃度也隨日糧中Met/Lys比值的平方而改變（P < 0.05）；隨著日糧中Met/Lys比值的增加血漿中大部分氨基酸的濃度也提高了；雖然日糧中Met/Lys比值對胎盤血管密度影響不顯著（P > 0.05），但日糧Met/Lys比值對胎盤血管密度有顯著的二次效應（P < 0.05）。此外，高產(chǎn)母豬仔豬出生重與胎盤血管密度呈顯著正相關(guān)（P < 0.01）。

       總體來說，日糧Met/Lys比值與仔豬出生重、胎盤血管生成性能呈二次曲線關(guān)系，其中0.37Met/Lys日糧組對高產(chǎn)母豬的生產(chǎn)性能貢獻最大。


       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.（轉(zhuǎn)自：豬營養(yǎng)國際論壇）