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首页> 外文期刊>Animal Production Science >An evaluation of three aerial pasture development methods on the Northern Tablelands of New South Wales, in terms of herbage on offer, botanical composition and animal performance
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An evaluation of three aerial pasture development methods on the Northern Tablelands of New South Wales, in terms of herbage on offer, botanical composition and animal performance

机译：从提供的牧草，植物组成和动物性能方面评估新南威尔士州北部高原上三种空中牧场开发方法

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Herbage mass on offer, botanical composition and livestock production of sheep grazing 3 types of pastures developed by 'aerial' methods at 3 stocking rates (5, 7.5 and 10 sheep/ha) were compared in a 3-year grazing trial at Glen Innes, N.S.W., during 1972-75. The pastures were: resident grass-white clover (F), resident pasture plus surface sown grass (SF), and as for SF but with herbicide application prior to surface sowing ofgrass (HSF). All pasture treatments had equivalent rates of superphosphate applied. The sowing effect and the herbicide effect were statistically analysed by contrasting the pasture treatments: SF-F, HSF-SF, respectively. The SF-F contrast showed that herbage on offer of the sown grasses on the SF pasture was greater, and this difference increased with time. Legume herbage on offer was greater on the SF pasture though it declined with time, and exhibited seasonal variation. The HSF-SF contrast indicated that herbage on offer: of sown grass was greater on the HSF pasture and increased with time; of the herbs component was greater on the HSF pasture during the initial and final stages of the experiment; oflegume was greater on the HSF pasture but the difference declined with time; of resident grass was greater on the SF pasture but the difference declined with time; and of dead material was consistently greater on the SF pasture. The contrasts for the resident grasses and dead material components varied seasonally. Herbage on offer of all pasture components declined as stocking rate was increased. Patterns of decline varied with pasture component and pasture treatment. Mean sheep liveweights were influenced by pasture treatment, with sheep on the HSF pasture being the heaviest, and those on the F pasture, the lightest. Increasing stocking rate decreased mean sheep liveweights on pastures F and SF but increased mean sheep liveweights on the HSF pasture. Liveweight declines were least for sheep grazing the F and SF pastures and liveweight increases were greatest on the HSF pasture during late summer-autumn. Greasy wool production per sheep was greatest on the HSF pasture during 1972-73 but thereafter there were no significant differences between treatments. We conclude that, although animal production was increased by the introduction of sown grasses in the short term, the level of superiority was not as great as expected. Changes in management strategies may be required if the greater production achieved is to be sustained.
机译：在Glen Innes进行的为期3年的放牧试验中，比较了提供的牧草质量，植物组成和绵羊放牧的3种牧场，它们通过3种放牧率（5、7.5和10绵羊/公顷）通过“空中”方法开发，新南威尔士州（1972-75）。牧场是：常驻草白三叶草（F），常驻牧草加表播草（SF），和SF一样，但在草表面播种（HSF）之前使用除草剂。所有牧草处理方法均施以同等比例的过磷酸盐。通过对比牧草处理：SF-F，HSF-SF，分别统计了播种效果和除草剂效果。 SF-F对比显示，SF牧场上播种的草提供的牧草更大，并且这种差异随时间增加。 SF牧场提供的豆科植物牧草较多，尽管随时间下降，并且表现出季节性变化。 HSF-SF对比表明，提供的草种：HSF牧场上播种的草更大，并且随时间增加；在实验的初始阶段和最后阶段，HSF牧场上的草药成分含量更高； HSF牧场的豆科植物含量较高，但差异随时间减少； SF草场上的常驻草的数量更大，但差异随时间减少； SF牧场上的死物数量始终较高。驻地草和死物成分的对比随季节变化。随着放牧率的提高，所有牧草组件提供的牧草减少。下降的方式随牧场组成和牧场处理而变化。绵羊平均体重受牧场处理的影响，HSF牧场的绵羊最重，而F牧场的绵羊最轻。放牧率的增加降低了F和SF牧场的平均绵羊活重，但增加了HSF牧场的平均绵羊活重。在夏末秋季，放牧F和SF牧场的绵羊活重下降最少，而HSF牧场的活重增加最大。在1972-73年间，HSF牧场上每只绵羊的油腻羊毛产量最高，但此后处理之间无显着差异。我们得出的结论是，尽管在短期内引入播种草可以增加畜牧生产，但优势水平却没有预期的那么好。如果要保持更大的产量，就可能需要改变管理策略。

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    《Animal Production Science》 |1987年第3期|p.389-398|共10页
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