Maximizing lucerne (Medicago sativa) pasture intake of dairy cows_1-The effect of pre-grazing pasture height and mixed ration level.pdf (1.33 MB)
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Maximizing lucerne (Medicago sativa) pasture intake of dairy cows: 1-The effect of pre-grazing pasture height and mixed ration level

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posted on 30.03.2022, 00:44 by Kieran AD Ison, Marcelo A Benvenutti, David G Mayer, Simon QuigleySimon Quigley, David G Barber
The effect of lucerne (Medicago sativa L.) pre-grazing pasture height on pasture intake and milk production was investigated in a sub-tropical partial mixed ration (PMR) dairy system in south-east Queensland, Australia. The experiment involved a 26-day adaptation period followed by an eight-day measurement period during April and May 2018. Twenty-four multiparous Holstein-Friesian dairy cows were offered a mixed ration at either 7 (low) or 14 (high) kg dry matter (DM)/cow/day and allocated pastures at pre-grazing heights ranging from 23 to 39 cm. The targeted pasture intake was 14 and 7 kg DM/cow/day for cows offered the low and high mixed ration allowances respectively, with a total intake target of 21 kg DM/cow/day. Pasture structure did not limit pasture intake as the all groups left at least 12% of the allocated area ungrazed, and therefore could selectively graze pasture. There was no significant difference in intake between mixed ration levels, however intake had a positive linear relationship with pre-grazing pasture height. For every one cm increase in pasture height, intake increased by 0.3 kg DM/cow/day. Using a grazing strategy that ensures the some pasture remains ungrazed and the pre-grazing height of lucerne is approximately 39 cm above ground level will maximise pasture intake in sub-tropical PMR dairy systems.

History

Volume

10

Issue

5

Start Page

1

End Page

15

Number of Pages

15

eISSN

2076-2615

Publisher

MDPI

Additional Rights

CC BY 4.0

Language

en

Peer Reviewed

Yes

Open Access

Yes

Acceptance Date

14/05/2020

External Author Affiliations

Queensland Department of Agriculture and Fisheries; The University of Queensland

Author Research Institute

Institute for Future Farming Systems

Era Eligible

Yes

Journal

Animals

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