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Grass Management Tools

NOTE: Currently, these tools are Windows-only. We apologize for the inconvenience.

GMT-1:  Grass NDF Estimation

This tool allows estimation of current NDF and target harvest height for several grass species. The user provides the current grass canopy height, planned stubble height, and target NDF at harvest.

Reference: Parsons, D., McRoberts, K., Cherney, J.H., Cherney, D.J.R., Bosworth, S., Jimenez-Serrano, F. 2012. Preharvest neutral detergent fiber concentration of temperate perennial grasses as influenced by stubble height. Crop Sci. (in press).

GMT-2:  Alfalfa-Grass NDF Estimation

This tool allows estimation of current NDF and target alfalfa harvest height for mixed alfalfa-grass stands. The user provides the current alfalfa maximum height (tallest stem) and percent grass in stand. The user can also modify target NDF for the stand, NDF rate of change per day, and also provide a slight adjustment for estimated weather conditions until harvest.

Reference: Parsons, D., Cherney, J. H., and Gauch, H. G., Jr. 2006. Estimation of Preharvest Fiber Content of Mixed Alfalfa-Grass Stands in New York. Agron. J. 98:1081-1089.

GMT-3:  Alfalfa NDF Estimation

This tool allows estimation of current NDF and target harvest height for pure alfalfa. The user provides the current maximum height (tallest stem), planned stubble height, and target NDF at harvest.

Reference: Parsons, D., Cherney, J. H., and Gauch, H. G., Jr. 2006. Estimation of spring forage quality for alfalfa in New York State. Online. Forage and Grazinglands doi:10.1094/FG-2006-0323-01-RS.

GMT-4:  Economic Analysis of Changing Forage Content of Diets

This tool allows estimation of return per cow or CWT of milk as the amount of grass forage in the diet changes. Actual returns are based on the results of a dairy cow feeding trial with 4 levels of grass in the diet. The results of the feeding trial cannot be altered, but prices of ration components can be.

Reference: Cherney, D.J.R., J.H. Cherney and L.E. Chase. 2002. Performance of lactating Holstein cows as influenced by forage species, maturity, and level of inclusion. Prof. Anim. Scientist 18:316-323.

GMT-5: Economic Analysis of Changing Alfalfa-Grass Content of Diets

This tool allows estimation of return per cow or CWT or milk as the ratio of alfalfa and fescue forage changes in diets of lactating dairy cows. Actual returns are based on the results of a feeding trial that included rations of pure alfalfa, pure fescue, and mixtures. The results of the feeding trial cannot be altered, but prices of ration components can be.

Reference: Cherney, D.J.R., J.H. Cherney and L.E. Chase. 2002. Influence of lucerne/fescue silage mixtures on milk production of early-lactation Holstein cows. J. Anim. Feed Sci. 11:555-564.