Silage from maize (Zea mays), annual ryegrass (Lolium multiflorum) or their mixture in the dry season feeding of grazing dairy cows in small-scale dairy production systems in the Highlands of Mexico
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- 作者：J. P. Anaya-Ortega ; G. Gardu帽o-Castro ; A. Espinoza-Ortega ; R. Rojo-Rubio and C. M. Arriaga-Jord谩n
- 关键词：Maize silage ; Annual ryegrass silage ; Mixed silages ; Grazing dairy cows ; Small ; scale systems ; Highlands ; Mexico
- 刊名：Tropical Animal Health and Production
- 出版时间：April, 2009
- 出版年：2009
- 期刊代码：75_00494747
- 类别：law
- 卷：41
- 期：4
- 页码：607-616
- 数据来源：sp
摘要
Small-scale dairy systems based on grazing have dry-season herbage shortages. A repeated 3 脳 3 Latin Square experiment evaluated grazing with silage from maize (MS), annual ryegrass (ARG) or a mixture (MIX) with 9 cows with 3 week periods; continuously grazed at 3.6 cows/ha with 3.6 kg DM/day of concentrate. Treatments were 7 kg DM of MS, ARG or a 2 MS:1 ARG mixture. Milk yield (MY), milk composition, live-weight, body condition, silage and concentrate intake were recorded. Herbage DM intake was estimated indirectly. Activity budgets were done for economic analysis. MY on MS (21.5 kg/cow/d) was 0.06 higher than on ARG (P < 0.09) with no differences on MIX. There were no differences for milk fat, milk protein, or body condition score. Live-weight on ARG was higher (P < 0.01) than on MS or MIX. Silage intake was higher (P < 0.01) on ARG and MS than on MIX. Herbage intake was lower (P < 0.05) on MS, compared with MIX and ARG. Total DM intake on ARG was higher than MS (P < 0.01), and MIX in between. MS resulted in 0.12 higher economic returns over ARG which had highest costs. Annual ryegrass may have a place in small-scale systems, but not as silage due to higher costs.