Access time to pasture under wet soil conditions : Effects on productivity and profitability of pasture-based dairying

Fenger, F. and Casey, I. A. and Holden, N. M. and Humphreys, J. (2022) Access time to pasture under wet soil conditions : Effects on productivity and profitability of pasture-based dairying. Journal of Dairy Science. ISSN 0022-0302 (In Press)

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Abstract

A long grazing season improves the profitability of pasture-based dairy production. It can entail grazing under wet soil conditions and the risk of damaging swards. Housing cows either temporarily or completely while soil moisture is high can avoid damaging swards. An experiment with 4 grazing systems was conducted over 3 yr (Sep. 1, 2013, to Aug. 31, 2016). The purpose was to evaluate whether soil moisture measurements are an effective decision support to assess the risk of treading damage and effects on pasture productivity and dairy cow performance during wet soil conditions. Access time to pasture between February and December of each grazing season was dependent on volumetric soil moisture content (VSMC, m3/m3) measured each morning: Control = cows were housed at VSMC >0.5 and otherwise allowed 22-h/d access to pasture; S<7 = cows were housed on days with VSMC >0.7 and otherwise allowed 22-h/d access to pasture; S7–6 = cows were housed at VSMC >0.7 and allowed 8-h/d access to pasture at VSMC between 0.7 and 0.6 and 22-h/d access at VSMC ≤0.6; S7–5 = cows were housed at VSMC >0.7 and allowed 8-h/d access to pasture at VSMC between 0.7 and 0.5 and 22-h/d access at VSMC ≤0.5. Cows with 8-h access per day received no other feeding when housed. All herds were compact spring-calving, with a mean calving date of Feb. 19. Mean stocking rate was 2.57 cows/ha. Measurements of VSMC provided an objective indicator for the risk of treading damage. Less time spent at pasture under wet soil conditions lowered treading damage but had no effect on annual pasture production (mean 14.8 t of organic matter/ha). Annual milk solids production per cow was lowest for the control herd (485 kg) and not different between the other systems (503 kg). Reducing treading damage to swards did not improve productivity or profitability of the grazing systems. Nevertheless, measuring soil moisture was a useful decision support for assessing the risk of treading damage when turning cows out to pasture.

Item Type:	Article
Additional Information:	Funding Information: This research was conducted with the financial support of the Irish Department of Agriculture, Food and the Marine (Dublin, Ireland), Project SOGGYLAND, under RSF-11-151, and by the Walsh Scholarship Programme (Oak Park, Carlow, Ireland). The authors acknowledge the technical input of Kerry Tuffy (University College Dublin, Dublin, Ireland), the farm staff at Teagasc Solohead Research Farm, and the laboratory staff at Teagasc Moorepark. The authors have not stated any conflicts of interest. Publisher Copyright: © 2022 American Dairy Science Association
Uncontrolled Keywords:	/dk/atira/pure/subjectarea/asjc/1100/1106
Departments or Groups:
Depositing User:	Admin SSL
Date Deposited:	19 Oct 2022 23:03
Last Modified:	07 Jun 2023 18:42
URI:	http://repository-testing.wit.ie/id/eprint/3846

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