One hundred forty winter calving suckler cows and their calves were managed through several years (1990-94) during the spring (March-June) and summer (June-September) grazing seasons on pastures dominated by perennial ryegrass and white clover or in hill pastures of Agrostis curtisii-Festuca rubra with areas of Nardus stricta and Calluna vulgaris to study the animal response to the available sward height in both type of vegetations. Sward height was measured weekly (HFRO, 1986, Hill Farming ResearchOrganisation, Biennial Report, 1984-1985, 50-51) and cows and calves weighed two consecutive days at the beginning and at the end of each grazing season. Sward height ranged from 4,5 to 10.1 cm in ryegrass-white clover pastures and from 2.2 to 5.6 on hill vegetation community.
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机译：在春季（3月至6月）和夏季（6月至9月）的放牧季节，以多年生黑麦草和白三叶草为主的牧场或山区草场管理了140只冬季犊牛及其犊牛，管理了数年（1990-94年）对Nargus stricta和寻常的Calluna的Agrostis curtisii-Festuca rubra进行研究，以研究动物对两种类型植被中可用草地高度的响应。每周测量草皮高度（HFRO，1986，Hill Farming Research Organisation，Biennial Report，1984-1985，50-51），在每个放牧季节的开始和结束时，母牛和犊牛连续两天称重。黑麦草白三叶草牧场的草皮高度范围为4.5至10.1厘米，丘陵植被群落的草皮高度范围为2.2至5.6。
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