Journal article

A quantitative case study assessment of biophysical and economic effects from altering season of calving in temperate pasture-based dairy systems.

OK Spaans, KA Macdonald, M Neal, MJ Auldist, JAS Lancaster, AM Bryant, GJ Doole, JR Roche

Journal of Dairy Science | American Dairy Science Association | Published : 2019

Abstract

In theory, a late winter-early spring calving date in temperate grazing systems best matches pasture supply and herd demand, thereby minimizing the need for nonpasture feeds and maximizing profitability. We used a quantitative case study approach to define the effects of season of calving on biophysical and financial performance in a grazing system without the confounding effects of imported feeds (i.e., milk production directly from grazed pasture). A 2-yr production system experiment was established to quantify the effects of changing onset of seasonal calving (i.e., planned start of calving; PSC) from winter (July in the Southern Hemisphere) to spring (October), summer, (January), or autu..

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