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首页> 外文期刊>Journal of Livestock Science >Pasture access times and milk fatty acid profile of dairy cows from central highland of Mexico
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Pasture access times and milk fatty acid profile of dairy cows from central highland of Mexico

机译：墨西哥中部高地奶牛的牧场获取时间和牛奶脂肪酸谱

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The objective was to assess the effect of different access times to pasture of grazing dairy cows on milk yield and fatty acid (FA) profile. Six multiparous Holstein cows were used in a repeated 3x3 Latin Square design. Treatments were 1) Eight hours of grazing (8h), 2) Eight hours of grazing divided in two periods (4+4h), and 3) Twelve hours of grazing (12h). Cows were fed maize silage and concentrate when confined in a free pen. There was no effect (P>0.05) on milk FA profile between 8h and 4+4h treatments. The 12h treatment showed a higher (P<0.05) concentration of rumenic acid (C18:2 c9t11) and higher total polyunsaturated FA in milk than milk from the other treatments. Cows grazing 8h and 4+4h had 36.3 and 27.9% higher (P<0.05) intake of maize silage compared to cows grazing 12h, but total DM intake was not affected (17.3 ± 1.9; P>0.05). There were no differences (P>0.05) in milk yield and chemical composition with different access times to pasture. The conclusion is that allowing 12h of grazing to dairy cows increased the concentration of C18:2 c9t11 in milk without affecting milk yield.
机译：目的是评估不同放牧时间进入放牧牧场的奶牛对奶产量和脂肪酸（FA）谱的影响。在重复的3x3拉丁广场设计中使用了六头荷斯坦牛。处理方法是：1）放牧八小时（8h），2）放牧八小时分为两个时期（4 + 4h），以及3）十二小时放牧（12h）。当用免费的围栏饲养时，给母牛饲喂玉米青贮饲料和浓缩饲料。在8h和4 + 4h处理之间，对牛奶FA的分布没有影响（P> 0.05）。 12h处理显示，与其他处理相比，牛奶中的瘤胃酸（C18：2 c9t11）浓度更高（P <0.05），总多不饱和FA含量更高。与放牧12h的母牛相比，放牧8h和4 + 4h的母牛的玉米青贮饲料摄入量分别高36.3和27.9％（P <0.05），但总干物质摄入量没有受到影响（17.3±1.9; P> 0.05）。进入牧场的时间不同，牛奶产量和化学成分没有差异（P> 0.05）。结论是让奶牛放牧12h可增加牛奶中C18：2 c9t11的浓度，而不会影响牛奶产量。

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