Validation of perennial ryegrass cultivar Forage Value Index rankings using independent trial data

Authors

  • C.I. Ludemann
  • C.M. Wims
  • D.F. Chapman

DOI:

https://doi.org/10.33584/jnzg.2017.79.562

Abstract

Abstract The current DairyNZ Forage Value Index (FVI) categorises ryegrass cultivar-endophyte combinations into five, 'star rating' groups for dry matter (DM) yield using data from the National Forage Variety Trial (NFVT) system. However, variability in performance of cultivars between trials raises the question of how cultivars with different star ratings perform against each other under different conditions. The validity of the FVI star rating categories for perennial ryegrass was assessed using cultivar DM yield data from two independent trials outside the NFVT system and under dairy cow grazing with white clover. Results from the trials were used in Monte Carlo simulations to provide a probabilistic determination of the likelihood of high FVI rated cultivars outperforming the low FVI rated cultivars. Results indicate selecting high FVI (5 star) perennial ryegrass cultivars over lower FVI (3 star) cultivars deliver greater contributions to dairy operating profit in over 94% of the simulated iterations for the Waikato and Canterbury. Keywords: Forage Value Index, Lolium perenne, plant breeding, selection, cultivars

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Published

2017-01-01

How to Cite

Ludemann, C., Wims, C., & Chapman, D. (2017). Validation of perennial ryegrass cultivar Forage Value Index rankings using independent trial data. Journal of New Zealand Grasslands, 79, 97–101. https://doi.org/10.33584/jnzg.2017.79.562

Issue

Volume 79, 2017, Whanganui

Section

Past volumes

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Copyright

This work is licensed under a Creative Commons Attribution-Non Commercial-NoDerivatives 4.0 International License. Rights granted to the New Zealand Grassland Association through this agreement are non-exclusive. You are free to publish the work(s) elsewhere and no ownership is assumed by the NZGA when storing or curating an electronic version of the work(s). The author(s) will receive no monetary return from the Association for the use of material contained in the manuscript. If I am one of several co-authors, I hereby confirm that I am authorized by my co-authors to grant this Licence as their agent on their behalf. For the avoidance of doubt, this includes the rights to supply the article in electronic and online forms and systems.