Grass forage quality and digestion kinetics as influenced by nitrogen fertilization and maturity
Grass forage quality and digestion kinetics as influenced by nitrogen fertilization and maturity
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DOI：
10.1080/09712119.1997.9706170
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发表时间：
1997-06-01
影响因子：
1.4
通讯作者：
Cherney, JH
中科院分区：
文献类型：
--
作者：
Cherney, DJR;Cherney, JH
目的是评估芦苇草和梯牧草的N施肥对纤维和N分配消化动力学和模型预测质量的影响。四个重复的田间小区，每种草收到一个5个水平的N施肥（0，67，90，135和269公斤N/公顷）和草进行了评估，在第一次切割2年。施肥与N影响纤维组成的平方两年。当牧草施肥量为269 kg/ha与0 kg/ha时，NDF体外消化率增加两倍，范围为1994年的0.041至0.087/h和1995年的0.047至0.078/h。粗蛋白质随施氮量的增加而线性增加（1994年和1995年分别从9.9%和11.9%增加到21.7%和22.3%）。1994年和1995年，随着施氮量从0增加到269 kg/ha，中性洗涤剂不溶性纤维分别从26.5%下降到18.0%和从27.5%下降到21.0%。由于较高的总CP，芦苇canarygrass饮食平衡少豆粕比梯牧草施肥时，0和90公斤N/公顷。然而，与28公斤N/公顷施肥的草，CP在草超过要求，更多的梯牧草可以用于饮食比芦苇草。虽然总CP较低的梯牧草，中性洗涤剂不溶性蛋白质高于在芦苇草。康奈尔大学的净碳水化合物和蛋白质系统模型预测，牧草种类，收获和生育管理将导致牛奶产量的差异，这些因素需要考虑时，作出管理决策。
Objectives were to assess the influence of N fertilization of reed canarygrass and timothy on fiber and N partitioning digestion kinetics and on model-predicted quality. Four replicated field plots of each grass received one of five levels of N fertilization (0, 67, 90, 135 and 269 kg of N/ha) and grasses were evaluated at first-cutting in 2 yr. Fertilization with N affected fiber composition quadratically both years. Rate of in vitro NDF digestion increased two fold when forages were fertilized with 269 versus 0 kg of N/ha, ranging from .041 to .087/h in 1994 and from .047 to .078/h in 1995. Crude protein increased linearly with increased N fertilization (from 9.9 to 21.7 % and from 11.9 to 22.3 % in 1994 and 1995, respectively). Neutral detergent insoluble fiber decreased from 26.5 to 18.0% and from 27.5 to 21.0% as N fertilization increased from 0 to 269 kg of N/ha in 1994 and 1995, respectively. Because of higher total CP, reed canarygrass diets balanced with less soybean meal than timothy when fertilized with 0 and 90 kg of N/ha. With grasses fertilized with 28 kg of N/ha, however, CP in grasses exceeded requirements and more timothy could be used in the diet than reed canarygrass. Although total CP was lower in timothy, neutral detergent insoluble protein was higher than In reed canarygrass. The Cornell Net Carbohydrate and Protein System model predicted forage species, harvest and fertility management will result in differences in milk production These factors need to be considered when making management decisions.