Effect of wheat silage maturity on digestion and milk yield in dairy cows.
Effect of wheat silage maturity on digestion and milk yield in dairy cows.
复制标题
小麦青贮成熟度对奶牛消化和产奶量的影响
DOI：
10.3168/jds.s0022-0302(94)76946-0
复制
发表时间：
1994
影响因子：
3.5
通讯作者：
G. Adin
中科院分区：
文献类型：
--
作者：
A. Arieli;G. Adin
在商品奶牛群条件下进行8wk泌乳试验，研究了小麦成熟度对高产奶牛日粮消化率和泌乳性能的影响。用早割或晚割小麦青贮料(开花中期或乳熟期结束时收获)饲喂Friesian奶牛(n=168)7 kg DM。每种日粮含有33%的NDF，其中18.5个百分点的单位来自牧草。两种日粮的采食量(22 kg/d DM)和DM消化率(63%)相似。饲粮NDF消化率早期青贮组(45.7%)高于晚期青贮组(41.3%)。虽然两种青贮料的DM在瘤胃中的降解率相似，但NDF的降解率在早期青贮料中高出24%。早切青贮组的产奶量比晚切青贮组分别高3.2 kg/d和0.85Mcal/d。显然，NDF含量不能准确地预测小麦青贮料的能量含量。
The effect of wheat crop maturity on diet digestibility and lactational performance by high yielding dairy cows was measured in an 8-wk lactation experiment under commercial dairy herd conditions. Friesian cows (n = 168) were fed 7 kg of DM from either early or late cut wheat silage (harvested at middle flowering or at the end of the milk stage). Each diet contained 33% NDF, 18.5 percentage units of which was from forage. Feed intake (22 kg/d of DM) and DM digestibility (63%) of the two diets were similar. Dietary NDF digestibility was higher in the early cut silage (45.7) than in the late cut silage (41.3%). Although DM from the two silages was similarly degraded in the rumen, degradability of NDF was 24% higher in the early cut silage. Yields of milk and milk energy in the cows receiving the early cut silage were higher than those of cows receiving the late cut silage by 3.2 kg/d and .85 Mcal/d, respectively. Apparently, NDF content is an inaccurate predictor of energy content of wheat silage.