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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Authors: | Anaya-Ortega J P Garduño-Castro G Espinoza-Ortega A Rojo-Rubio R Arriaga-Jordán C M |
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Institution: | (1) Centro de Investigación en Ciencias Agropecuarias (CICA), Universidad Autónoma del Estado de México, Instituto Literario # 100, 50000 Toluca, Estado de México, México;(2) Centro Universitario UAEM Temascaltepec, Universidad Autónoma del Estado de México, Instituto Literario # 100, 50000 Toluca, Estado de México, México;(3) Secretaría de Investigación y Estudios Avanzados, Universidad Autónoma del Estado de México, Instituto Literario # 100, 50000 Toluca, Estado de México, México |
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Abstract: | Small-scale dairy systems based on grazing have dry-season herbage shortages. A repeated 3 × 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. |
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Keywords: | Maize silage Annual ryegrass silage Mixed silages Grazing dairy cows Small-scale systems Highlands Mexico |
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