Suppr超能文献

泌乳奶牛的日粮阴阳离子差、酸碱状态、矿物质代谢、肾功能及产奶量

Dietary cation-anion difference, acid-base status, mineral metabolism, renal function, and milk production of lactating cows.

作者信息

Delaquis A M, Block E

机构信息

Department of Animal Science, McGill University, Sainte-Anne de Bellevue, QC, Canada.

出版信息

J Dairy Sci. 1995 Oct;78(10):2259-84. doi: 10.3168/jds.S0022-0302(95)76853-9.

Abstract

Three switchback experiments were conducted with 12 cows in early lactation, 12 cows in midlactation, and 12 cows in late lactation. Each experiment compared two dietary cation-anion differences. Increasing dietary cation-anion difference increased DMI and milk production in early and midlactation. These effects were not observed in late lactation. Production of milk protein and lactose and concentration of lactose were increased by the higher dietary cation-anion difference in early lactation. Higher dietary cation-anion difference reduced milk fat concentration in midlactation because of the higher milk production. In late lactation, none of the milk components were affected by dietary cation-anion difference. In early and midlactation, apparent absorption of water and urine volume were increased by a higher dietary cation-anion difference; these effects were not caused by higher intake of Na or by higher glomerular filtration rate. Intake, balance, and concentration of S in plasma were increased by the lower cation-anion difference at all stages of lactation. Excretion of HCO3- in urine was reduced by a lower dietary cation-anion difference at all stages of lactation, but secretion of protons in milk was reduced in late lactation only. Increasing dietary cation-anion difference does affect acid-base parameters in urine at all stages of lactation, but DMI and milk production of cows were affected in early and midlactation only.

摘要

对12头处于泌乳早期的奶牛、12头处于泌乳中期的奶牛和12头处于泌乳后期的奶牛进行了三项折返试验。每项试验比较了两种日粮阴阳离子差。增加日粮阴阳离子差可提高泌乳早期和中期的干物质采食量(DMI)和产奶量。在泌乳后期未观察到这些影响。在泌乳早期,较高的日粮阴阳离子差可提高乳蛋白和乳糖的产量以及乳糖浓度。由于产奶量较高,较高的日粮阴阳离子差会降低泌乳中期的乳脂浓度。在泌乳后期,日粮阴阳离子差对任何乳成分均无影响。在泌乳早期和中期,较高的日粮阴阳离子差会增加水的表观吸收量和尿量;这些影响并非由较高的钠摄入量或较高的肾小球滤过率引起。在泌乳的各个阶段,较低的阴阳离子差会增加血浆中硫的摄入量、平衡量和浓度。在泌乳的各个阶段,较低的日粮阴阳离子差会减少尿液中HCO3-的排泄,但仅在泌乳后期会减少牛奶中质子的分泌。增加日粮阴阳离子差确实会影响泌乳各阶段尿液的酸碱参数,但仅对泌乳早期和中期奶牛的DMI和产奶量有影响。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验