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The effects of sodium fertilizer application to perennial ryegrass pasture and direct sodium supplementation on dairy cow production and grazing preference

Published online by Cambridge University Press:  24 November 2017

P.C. Chiy  and
C.J.C. Phillips
P.C. Chiy
Affiliation:
School of Agricultural & Forest Sciences, University College of North Wales, Bangor, Gwynedd
C.J.C. Phillips
Affiliation:
School of Agricultural & Forest Sciences, University College of North Wales, Bangor, Gwynedd
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Extract

At least 25% of herbage grown in Britain contains Inadequate sodium (Na) for lactating cows (Baxter, 1968). The chances of defelcincy have been increased in recent years as more potassium (K) fertilizer has been applied which reduces herbage Na content. Voluntary DM intake of conserved feeds supplemented with Nacl is increased up to 5.5g Na/kgDM but thereafter declines (Shnelder et al., 1986). There is evidence that ruminants will select a high Na diet even when Na requirements are met (Michell and Moss, 1988). Milk yield responses to increased dietary sodium above ARC (1980) recommended allowances have been observed in some experiments (Mallonee, 1984; Schneider et al., 1988) but not in others (O'Connor et al, 1988). This experiment aimed to examine the effects of Nacl application to perennial ryegrass pasture on herbage and dairy cattle productivity, on the preference for Nacl fertilized pasture and to distinguish these effects from those of direct supplementation in concentrates.

Type
Grazing and conservation for dairy cattle
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1991 , March 1991 , pp. 52
Copyright
Copyright © The British Society of Animal Production 1991

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References

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