Effect of potassium content and dusting of sodium chloride on the pasture preference of dairy cows
| Autor: | C. J. Roach, J. D. Morton, A. H. C. Roberts |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | New Zealand Journal of Agricultural Research. 48:29-37 |
| ISSN: | 1175-8775 0028-8233 |
| DOI: | 10.1080/00288233.2005.9513628 |
| Popis: | The potassium (K) content of New Zealand ryegrass/white clover pastures can exceed the requirements for optimum pasture production (2.5–3.0%) and dairy cow requirements (0.2–0.6%) during late spring. Experiments were carried out at 13 sites in three different dairying regions over 2–3 years on different soil types to determine the effects on the cow's preference for pasture of either increasing pasture K content from applications of 0, 200, 400, and 800 kg of potassium chloride (KCl) ha–1, or the effect of dusting sodium chloride (NaCl) at 0, 5, 10, and 20 kg ha–1 immediately before grazing. Cow preference was assessed by measurements of bite rate, grazing time, pasture dry matter (DM) disappearance, and bite size. In addition, the pasture intake of two groups of cows, one group grazing pasture with K content in the optimum range for pasture production, and one group on pasture above that range, was measured using the alkane technique. In South Taranaki on Allophanic soils, increasing pasture K c... |
| Databáze: | OpenAIRE |
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