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首页> 外文期刊>Tropical Animal Health and Production >Milk production and estimated enteric methane emission from cows grazing ryegrass pastures in small-scale dairy systems in Mexico
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Milk production and estimated enteric methane emission from cows grazing ryegrass pastures in small-scale dairy systems in Mexico

机译：奶牛生产和估计肠道甲烷排放从墨西哥小规模乳制品系统中放牧牧场

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摘要

The work assessed the productive response and estimated enteric methane (CH4) emissions of dairy cows grazing in small-scale dairy systems. Treatments were grazing annual pasture (AP) mainly of annual ryegrass and perennial pasture (PP) mainly of perennial ryegrass, complemented daily with 3.72 kg DM/cow of commercial concentrate. Eight Holstein cows were used in a double cross-over design with three 14-day-each experimental periods for animal variables and CH(4)emissions. Pasture variables were analysed with a split-plot design. AP showed higher sward height (P < 0.05) with no differences (P > 0.05) in net herbage accumulation or in herbage chemical composition. Cows on AP yielded 24.6% more milk (P < 0.001) than grazing PP, but there were no differences in milk fat and protein content. There were differences (P <= 0.05) among periods for milk yields, but no differences among periods for milk fat and protein. Milk urea nitrogen was significantly higher (P < 0.001) in PP than in AP with no differences among periods. There was higher (P < 0.001) DMI for AP than PP with a significant decline (P < 0.05) as periods progressed. There was a trend (P = 0.08) for higher daily CH4/cow in AP, but significantly lower emissions (7.2%) in AP/kg DMI, and 20.1% lower emission intensity of g CH4/kg milk. The proportion of gross energy lost as CH(4)for AP was lower (P < 0.01). Higher milk yields in AP resulted in a 26% higher margin over feed costs than for PP. Results show that grazing annual pastures with moderate concentrate supplementation results in higher milk yields, higher incomes, and reduces the intensity of CH(4)emissions.
机译：该工作评估了在小规模乳制品系统中放牧的奶牛的生产响应和估计的肠溶甲烷（CH4）排放。治疗饲养年度牧场（AP）主要是每年黑麦草和多年生牧场（PP）主要是多年生黑麦草，每日补充，商业集中力的3.72公斤/牛牛。八个荷斯坦奶牛用于双交叉设计，具有三个为期14天的动物变量和CH（4）排放的实验期。用分裂图设计分析牧场变量。 AP显示出较高的草莓高度（P <0.05），网牧草积累或牧草化学组合物中没有差异（p> 0.05）。 AP上的奶牛产生24.6％的牛奶（P <0.001）比放牧PP，但乳脂和蛋白质含量没有差异。牛奶产量的时期存在差异（p <= 0.05），但对乳脂和蛋白质的时期没有差异。 PP中乳尿素氮在PP中显着升高（P <0.001），而不是在没有差异之间的差异。随着PP而言，AP的PP具有更高（p <0.001）DMI（P <0.05），随着期间的进展。在AP中的每日CH4 /母牛的趋势（p = 0.08），但AP / kg DMI的排放显着降低（7.2％），G CH4 / kg牛奶的发射强度为20.1％。作为AP的CH（4）丢失的总能量的比例较低（P <0.01）。 AP中较高的牛奶产量导致饲料成本高出26％，而不是PP。结果表明，采用中等浓缩素的牧场饲养较高的牛奶产量，收入较高，并降低了CH（4）排放的强度。

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