Saylor Benjamin A, Min Doohong, Bradford Barry J
Department of Animal Sciences and Industry, Kansas State University, Manhattan, KS 66506, USA.
Department of Agronomy, Kansas State University, Manhattan, KS 66506, USA.
J Anim Sci Technol. 2021 May;63(3):510-519. doi: 10.5187/jast.2021.e56. Epub 2021 May 31.
One of the most pressing issues facing the dairy industry is drought. In areas where annual precipitation is low, irrigation for growing feed presents the greatest water-utilization challenge for dairy producers. Here, we investigated the effects of cultivar and harvest days after planting (DAP) on dry matter (DM) yield and nutritive value of teff (), a warm-season annual grass native to Ethiopia that is well adapted to drought conditions. Eighty pots were blocked by location in a greenhouse and randomly assigned to four teff cultivars (Tiffany, Moxie, Corvallis, and Dessie) and to five harvest times (40, 45, 50, 55, or 60 DAP). Cultivars had no effect on DM yield and nutritive value. As harvest time increased from 40 to 60 DAP, DM yield and ash-free neutral detergent fiber (aNDFom) concentrations increased, while crude protein (CP) concentrations and NDF digestibility decreased. To assess carryover effects of time of harvest on yield and nutritive value, two additional cuttings were taken from each pot. Increasing first-cutting harvest time decreased CP concentrations in the second cutting and reduced DM yields in the second and third cutting. Harvesting teff between 45 and 50 DAP best optimized forage yield and nutritive value in the first and subsequent cuttings.
乳制品行业面临的最紧迫问题之一是干旱。在年降水量较低的地区，种植饲料所需的灌溉对乳制品生产商来说是最大的用水挑战。在此，我们研究了品种和种植后天数（DAP）对画眉草（一种原产于埃塞俄比亚的暖季一年生草本植物，非常适应干旱条件）干物质（DM）产量和营养价值的影响。80个花盆在温室中按位置进行区组，并随机分配给4个画眉草品种（蒂芙尼、莫克西、科瓦利斯和德西）以及5个收获时间（40、45、50、55或60 DAP）。品种对DM产量和营养价值没有影响。随着收获时间从40 DAP增加到60 DAP，DM产量和无灰中性洗涤纤维（aNDFom）浓度增加，而粗蛋白（CP）浓度和NDF消化率降低。为了评估收获时间对产量和营养价值的残留影响，从每个花盆中又进行了两次刈割。增加第一次刈割的收获时间会降低第二次刈割中的CP浓度，并降低第二次和第三次刈割中的DM产量。在45至50 DAP之间收获画眉草最有利于第一次及后续刈割中的草料产量和营养价值的优化。
