Tackling the future challenges of Organic Animal Husbandry - vTI

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! Agriculture and Forestry Research, Special Issue No 362 (Braunschweig, 2012) ISSN 0376-0723 Download: www.vti.bund.de/en/startseite/vti-publications/landbauforschung-special-issues.html 270 Herd parameters in organic and conventional dairy farms and their role in greenhouse gas emissions from milk production Abstract BRITTA BLANK 1 , DAGMAR SCHAUB 1 , HANS MARTEN PAULSEN 1 , GEROLD RAHMANN 1 Thuenen-Institute of Organic Farming, Westerau, Germany, www.oel-vti.de, britta.blank@vti.bund.de In the study on „Climate effects and sustainability of organic and conventional farming systems” 44 paired organic and conventional dairy farms in Germany were compared. Over three years, data on performance, management and feeding were collected on the farms and feed samples were collected and analyzed. First analyses show that on average the organic farms have a significantly higher longevity (39 month) and grazing time (2510 h*a -1 ) than the conventional farms. On the other hand, mean milk yields (6478 kg*cow -1 *a -1 ) and lifetime efficiency (10.3 kg*cow -1 *d -1 ) are significantly lower on the organic farms. In both farming systems lifetime efficiency significantly decreases with increasing age at first calving (p
Results RAHMANN G & GODINHO D (Ed.) (2012): Tackling the Future Challenges of Organic Animal Husbandry. Proceedings of the 2 nd OAHC, Hamburg/Trenthorst, Germany, Sep 12-14, 2012 A short description of the 22 studied farm pairs is given in table 1. Figure 1 shows correlations between several performance parameters of the farms. Table 1. Overview of selected parameters of the organic and conventional dairy farms (mean and range (min-max) of the years 2009/2010/2011) n organic n conventional number of farms 22 22 farm area (hectare) 22 249 (30-1299) 22 312 (35-1959) herd size 22 71 (18-257) 22 113 (26-450) milk yield (kg*cow -1 year -1 ) 21 6478** (4307-9289) 21 8571** (6130-10588) milk protein (%) 21 3.28** (3.03-3.66) 21 3.42** (3.18-3.55) milk fat (%) 21 4.06 (3.68-4.43) 21 4.10 (3.38-4.39) age at first calving (months) 19 31** (26-35) 17 28** (25-33) productive life-span (months) 19 39** (25-59) 16 27** (18-37) lifetime efficiency (kg*cow -1 day -1 ) 19 10.3** (6.1-14.8) 17 12.0** (7.6-15.4) calving interval (days) 21 409 (364-502) 19 406 (365-433) NEL (MJ*kg -1 in DM) in roughage 22 6.0 (3.94-7.32) 22 5.95 (3.86-8.46) NEL (MJ*kg -1 in DM) in concentrate 22 8.11 (6.64-8.99) 22 7.88 (5.04-8.96) grazing time (h*year -1 ) 16 2510 (1008-5856) 13 774 (0-3048) ** significant at p
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Sonderheft 362 Special Issue Tackli
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Landbauforschung vTI Agriculture an
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Foreword Organic animal husbandry s
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RAHMANN G & GODINHO D (Ed.) (2012):
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Content RAHMANN G & GODINHO D (Ed.)
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Introduction RAHMANN G & GODINHO D
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References RAHMANN G & GODINHO D (E
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Abstract RAHMANN G & GODINHO D (Ed.
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Discussion RAHMANN G & GODINHO D (E
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Factors Plant Height (cm) RAHMANN G
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Kg liveweight (mean) RAHMANN G & GO
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