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Accumulating herbage during autumn to extend the grazing season in pasture-based dairy systems
Grass and Forage Science ( IF 2.4 ) Pub Date : 2021-07-30 , DOI: 10.1111/gfs.12547
Friederike Fenger 1, 2 , Imelda A. Casey 2 , James Humphreys 1
Affiliation  

A longer grazing season can lower the costs of pasture-based dairy production. Accumulating herbage during autumn increases herbage mass available for grazing in late autumn and the following spring but results in higher pre-grazing herbage mass (PGHM). This could affect sward nutritive value and milk production. The effects of accumulating herbage during autumn on the length of the grazing season, nutritive value, milk production and the supply of herbage mass in the following spring (opening) were examined at systems scale in this study. The dataset was 60 grazing systems from systems comparisons conducted between 2001 and 2018 with spring-calving dairy herds (mean stocking rate 2.4 cows ha−1) at Solohead Research Farm, Ireland. Herbage mass accumulated per system was measured as average herbage mass (AHM; herbage mass >4 cm; average of all paddocks). A higher PGHM (1,783 vs. 1,445 kg dry matter [DM] ha−1, p < 0.001, standard error of the mean [SEM] 32.5) and peak AHM (highest AHM; 1,345 vs. 1,139 kg DM ha−1, p = 0.002, SEM 39.2) during late summer and autumn (1 August to end of grazing season [closing]) did not affect herbage nutritive value or milk production (p > 0.05). Each increase in peak AHM of 100 kg DM ha−1 increased days at pasture per cow in late summer and autumn by 2.2 ± 0.44 (p < 0.001, partial R2 = 0.46) and increased closing AHM by 46 ± 6.5 kg DM ha−1 (p < 0.001, partial R2 = 0.42). Opening AHM in February increased with closing AHM (p < 0.001, R2 = 0.41). Accumulating herbage during late summer and autumn facilitated a longer grazing season while not impacting on milk production.

中文翻译:

在秋季积累牧草以延长牧场奶牛系统的放牧季节

更长的放牧季节可以降低以牧场为基础的奶制品生产成本。在秋季积累牧草增加了晚秋和次年春季可用于放牧的牧草质量,但导致更高的放牧前牧草质量(PGHM)。这可能会影响牧草的营养价值和产奶量。本研究在系统规模上研究了秋季积累牧草对放牧季节长度、营养价值、产奶量和次年春季(开放)牧草质量供应的影响。该数据集是 60 个放牧系统,来自 2001 年至 2018 年与春季产犊奶牛群进行的系统比较(平均放养率 2.4 头奶牛 ha -1) 在爱尔兰的 Solohead 研究农场。每个系统累积的草本质量被测量为平均草本质量(AHM;草本质量 > 4 厘米;所有围场的平均值)。更高的 PGHM(1,783 对 1,445 kg 干物质 [DM] ha -1p  < 0.001,平均值的标准误差 [ SEM ] 32.5)和峰值 AHM(最高 AHM;1,345 对 1,139 kg DM ha -1p  = 0.002, SEM 39.2) 在夏末和秋季(8 月 1 日至放牧季节结束 [关闭])不影响牧草营养价值或产奶量 ( p  > 0.05)。每增加 100 kg DM ha -1的峰值 AHM,夏末和秋季每头奶牛在牧场上的天数就会增加 2.2 ± 0.44 ( p < 0.001,部分R 2  = 0.46),并且关闭 AHM 增加 46 ± 6.5 kg DM ha -1p  < 0.001,部分R 2  = 0.42)。2 月 AHM 开盘随着 AHM 收盘而增加(p  < 0.001,R 2  = 0.41)。在夏末和秋季积累牧草有助于延长放牧季节,同时不会影响牛奶产量。
更新日期:2021-07-30
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