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Abstract
Two primary roughages used for diets of dairy cows are corn silage (Zea mays L.) and alfalfa (Medicago sativa L.). A dairy forage system model was used to compare the relative merits of these two forages when varied amounts (none, one-third, two-thirds, and all on a dry matter basis) of the forage requirement were ammoniated corn silage and the remainder was alfalfa. Primary comparisons were the net return above feed and manure costs, but manure management issues and labor requirements were also considered. Economic comparisons were made for representative farms using a partial budget analysis synthesized from research reports and surveys. The highest net return was from alfalfa at 100% of the forage requirement, but differences in net returns across forage systems were small compared with the variation caused by weather among years. Changes in assumptions concerning farm size, soil type, crop yield, milk production, relative prices, and manure handling did not affect the conclusions of the analysis. In systems that used all alfalfa forage, much of the manure was applied to alfalfa crops, a practice that is normally discouraged because the manure reduces weed control, stand persistence, and yield. With alfalfa at 100% of the forage requirement, large amounts of excess manure nitrogen were produced on the farm. Application of nitrogen to alfalfa must be compensated by a reduced nitrogen fixation to avoid ground water contamination. Because of the lack of a strong economic advantage among the forage systems, the practice of having at least one-third of the forage requirement provided by each of the forage crops is favored to improve management of crops, manure disposal, and labor.
Key words
Abbreviation Key:
DAFOSYM (dairy forage system model)References
- Alfalfa and corn silage combinations to maximize Michigan dairy farm income..Agric. Econ. Dep., Michigan State Univ., East Lansing1974 (Staff Paper No. 74-10)
Borton, L. R. 1997. A comparison of corn silage and alfalfa for forage on Michigan dairy farms. Ph.D. Diss., Michigan State Univ., East Lansing.
- Summary of the 1988 northern U.S. dairy farm survey.Michigan Agric. Exp., Stn., East Lansing1990 (Res. Rep. 509)
- Simulation to evaluate dairy manure systems.Appl. Eng. Agric. 1995; 11: 301
- Alfalfa silage or hay versus corn silage as the sole forage for lactating dairy cows.J. Dairy Sci. 1985; 68: 3262
- Fertilizer recommendations for field crops in Michigan.Coop. Ext. Serv., Michigan State Univ, East Lansing1992 (Bull. E-550A)
- Formulating dairy rations with neutral detergent fiber. 1. Effect of silage source.J. Dairy Sci. 1986; 69: 2718
- Summary of the 1987 Michigan State University dairy farm survey..Michigan Agric. Exp. Stn, East Lansing1989 (Res. Rep. No. 498)
- Rotational cropping sequence affects yield of corn and soybean.Agron. J. 1991; 83: 108
- Forage and grain programs for dairy farms with varying cow-land ratios..New York's Food and Life Sciences Exp. Stn, Ithaca1973 (Bull. No. 27)
- Milk yield and rumen fermentation measurements in cows fed diets containing different proportions of alfalfa and corn silage.J. Dairy Sci. 1994; 77 (Abstr.): 222
- Corn hybrids compared in the 1994 season..Coop. Ext. Serv., Michigan State Univ, East Lansing1994 (Bull. E-431 (rev.))
- Michigan Agricultural Statistics 1992.USDA Natl. Agric. Stat. Serv. Michigan Dep. Agric, Lansing1992
- Fertilizer N equivalence of alfalfa, birdsfoot trefoil, and red clover for succeeding corn crops.J. Prod. Agric. 1988; 1: 313
- Minnesota farm machinery economic cost estimates for 1990.Minnesota Coop. Ext. Serv, St. Paul1990
- Exploiting forage legumes for nitrogen contribution in cropping systems.in: Hargrove W. Cropping Strategies for Efficient Use of Water and Nitrogen. Am. Soc. Agron, Madison, WI1988: 155 (Spec. Publ. No. 51)
- Economics of growing and feeding alfalfa and corn silage to dairy cattle.Michigan Agric. Exp. Stn, East Lansing1972 (Rep. No. 154)
- Jones C.A. Kiniry J.R. CERES-Maize: A Simulation Model of Maize Growth and Development. Texas A&M Univ. Press, College Station1986
- Economic utilization of forages in the production of milk and beef in the northeast United States.Agric. Econ. Dep., Cornell Univ, Ithaca, NY1979 (Staff Paper No. 79-29)
- Corn silage versus alfalfa on average dairy farms.Agric. Econ. Dep., Michigan State Univ, East Lansing1974 (Rep. No. 265)
- Projected profitability on Michigan dairy farms in the 1990's.Agric. Econ. Dep., Michigan State Univ, East Lansing1990 (Rep. No 530)
- 1992 crops and livestock budget estimates for Michigan.Agric. Econ. Dep., Michigan State Univ, East Lansing1992 (Rep. No. 556)
- Competitive relationship of alfalfa hay and corn silage in complete rations for lactating dairy cows..Nebraska Agric. Exp. Stn., Lincoln1973 (Rep. No. SB523)
Parsch, L. D. 1982. DAFOSYM: a system simulation model for analyzing the economics of forages on commercial dairy farms. Ph.D. Diss., Michigan State Univ., East Lansing.
- DAFOSYM: a model of the dairy forage system.J. Prod. Agric. 1989; 2: 83
- Economic potential of preserving high-moisture hay.Appl. Eng. Agric. 1992; 8: 315
- DAFOSYM: a dairy forage system model for evaluating alternatives in forage conservation.J. Dairy Sci. 1989; 72: 3050
- Economics of swath manipulation during field curing of alfalfa.Appl. Eng. Agric. 1992; 7: 316
- Estimating nitrogen and rotation effects in legume-corn rotations.in: Power J.F. The Role of Legumes in Conservation Tillage Systems. Soil Conservation Soc. Am, Ankeny, IA1987: 41
Article info
Publication history
Accepted:
December 19,
1996
Received:
February 26,
1996
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© 1997 American Dairy Science Association. Published by Elsevier Inc.
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