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The influence of end-grazing forage residual and grazing management on lamb growth performance and crop yield from irrigated dual-purpose winter wheat

Citation

Miller, Dale and Dean, GJ and Ball, PD, The influence of end-grazing forage residual and grazing management on lamb growth performance and crop yield from irrigated dual-purpose winter wheat, Animal Production Science (Special Issue: Animal Production in Australia, Proceedings of the Australian Society of Animal Production), 11-15 July 2010, Armidale, NSW, pp. 508-512. ISSN 1836-0939 (2010) [Refereed Conference Paper]


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Copyright Statement

Copyright 2010 CSIRO

DOI: doi:10.1071/AN09163

Abstract

The effects of end-grazing forage residual and continuous v. rotational grazing systems on prime lamb performance, grain yield and quality were examined in an irrigated dual-purpose winter wheat (cv. Mackellar) crop in Tasmania. The design was a two end-grazing residual (400 and 800 kg/ha of dry matter (DM) at Zadoks Growth Stage 30, Low and High respectively, 0.2 ha plots) two grazing system (continuously, or rotationally grazed in four subplots) factorial, replicated three times. Mixed-sex, second-cross lambs [37 kg liveweight (LW), 2.5 body condition score, 45 kg DM/head initial feed allowance] grazed for a total of 46 days before removal. Initial feed availability was 1875 kg DM/ha, with final residuals of 520 57 and 940 70 kg DM/ha for the Low and High treatments respectively. Particularly for the Low residual, in vitro DM digestibility and crude protein at stem elongation were reduced (P < 0.05) by rotational compared with continuous grazing. The weekly lamb growth rate (g/day) during the first 5 weeks of grazing was linearly related to average weekly available DM in kg/ha (GR = 0.35 0.041 DM 194 49.0, P < 0.01, R2 = 0.56). Total LW produced (336 11.7 kg/ha), and grain yield (6.9 0.21 t/ha), protein (11.4%), screenings <2.2 mm (10.9%) and 100 grain weights (3.82 g DM) were not different between treatments. There were no advantages of rotational grazing compared with continuous grazing. Irrigated dual-purpose winter wheat can be continuously grazed by lambs up to a 500 kg DM/ha residual at stem elongation without compromising total LW produced, grain yields or grain quality.

Item Details

Item Type:Refereed Conference Paper
Research Division:Agricultural and Veterinary Sciences
Research Group:Animal Production
Research Field:Animal Management
Objective Division:Animal Production and Animal Primary Products
Objective Group:Livestock Raising
Objective Field:Sheep - Meat
Author:Miller, Dale (Dr Dale Miller)
Author:Dean, GJ (Mr Geoffrey Dean)
Author:Ball, PD (Mr Peter Ball)
ID Code:58819
Year Published:2010
Web of Science® Times Cited:7
Deposited By:Agricultural Science
Deposited On:2009-10-29
Last Modified:2014-12-02
Downloads:336 View Download Statistics

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