Ettle T, Lebzien P, Flachowsky G, Schwarz F J
Wissenschaftszentrum Weihenstephan für Ernährung, Landnutzung und Umwelt, Department für Tierwissenschaften, Bereich Tierernährung, Technische Universität München, Hochfeldweg 4, D-85350.
Arch Tierernahr. 2001;55(1):69-84. doi: 10.1080/17450390109386183.
In this study we investigated the influence of harvest date and genotype on the ruminal degradability of the organic matter of ensiled maize grains. Grains of the varieties Avenir, Byzance, CGS 5104 and CGS 5107 from six different harvest dates were available; they are classified as intermediate types between flint and dent corn. The six harvest dates, during which time the dry matter content of the ensiled grains rose from 52% to 66%, extended from 1st September to 19th October. Assuming a passage rate of k = 0.08, the effective ruminal degradability declined in this period on average from 93% to just under 79%; variety-specific deviations also increased markedly during this period. The dry matter content (x, DM in %) of the ensiled grains had a profound influence on ruminal degradation: a highly significant curvilinear decline in ruminal degradability (y) was calculated at increasing DM levels (k = 0.08), which can be described by the equation y = -0.072x2 (+/- 0.010) + 7.417x (+/- 1.186) - 98.71 (+/- 34.58) (B = 0.96; sy.x[%] = 1.36). The ruminal degradability of ensiled maize grains is about 5-10% higher than that of fresh maize grains.
在本研究中，我们调查了收获日期和基因型对青贮玉米粒有机物质瘤胃降解率的影响。有来自六个不同收获日期的Avenir、Byzance、CGS 5104和CGS 5107品种的玉米粒；它们被归类为硬粒玉米和马齿型玉米之间的中间类型。六个收获日期从9月1日持续到10月19日，在此期间青贮玉米粒的干物质含量从52%升至66%。假设流通率k = 0.08，在此期间有效瘤胃降解率平均从93%降至略低于79%；品种特异性偏差在此期间也显著增加。青贮玉米粒的干物质含量（x，干物质百分比）对瘤胃降解有深远影响：在干物质水平增加时（k = 0.08），计算出瘤胃降解率（y）呈极显著的曲线下降，其可由方程y = -0.072x2（±0.010）+ 7.417x（±1.186） - 98.71（±34.58）描述（B = 0.96；sy.x[%] = 1.36）。青贮玉米粒的瘤胃降解率比新鲜玉米粒高约5 - 10%。
