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 14° 04‘ 26‘‘). The dairy herd was managed in a pasture based, low input system with block calving and consisted of conventional Brown Swiss (BS) and a specific strain of Holstein Friesian (HFL). While the BS cows represented the average breeding goal of the Austrian BS population, the HFL animals were selected for superior lifetime performance and fertility for more than 30 years. In total, data from 89 lactations were collected (40 lactations from 19 individual BS and 49 lactations from 23 individual HFL cows). Average lactation numbers were 3.3, 3.0, 2.3 and 2.6 in experimental years one, two, three and four, respectively. For BS and HFL mean numbers of parities were 2.5 and 2.9, respectively. Calvings were aspired between November and March and breeding started after 30 days in milk (DIM). Animals which did not conceive until June 30 were culled after 305 DIM or were newly inseminated after January 15 of the following year. Mean calving date was balanced between years and breeds. Individual rations were calculated throughout the experimental period, taking into account individual milk yield, milk composition and body weight. Detailed ration composition during dry period and lactation, as well as during barn and pasture feeding period was reported previously by Steinwidder et al. (2011). During the barn feeding period, the diet consisted of 5 kg of hay and grass silage ad libitum. Concentrate supplementation was increased until 21 DIM and depended on milk yield afterwards. Grazing period lasted from the beginning of April until the end of October (± 15 d). Cows had free access to a continuously grazed sward (height Ø 4.0-5.5 cm, estimated with Filip´s Folding Plate Pasture Meter). Pasture yield and botanical composition has been reported previously by Starz et al. (2010). At the beginning of grazing, a gradual transition from barn to pasture feeding was done. At the beginning of day and night grazing (end of April), silage feeding in the barn was stopped. During the grazing period cows received 1.5 kg hay per day and only cows yielding more than 28 kg per day received concentrate supplementation. At the end of October daily grazing time was constantly reduced and the grazing period was terminated at the beginning of November. In parallel, the quantity of hay and grass silage offered in the barn was increased. Individual milk yield was recorded twice daily. Milk samples were taken three times per week for determination of milk fat, protein, lactose and urea content as well as somatic cell count. Cows were weighted weekly after morning milking. Rations were provided in Calan gates and daily feed intake was recorded during the barn period. During the grazing period, herbage intake was estimated taking into account hay and concentrate intake, milk yield and composition, live weight and live weight change. The dataset was analysed using the MIXED procedure of SAS 9.2. The model contained breed, year, parity and barn feeding regime within year as fixed effects and days in milk at the beginning of the grazing period as a covariate. Animal within breed was included as a random effect. P-Values
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 Table 1. Effect of breed on milk production and composition, life weight and reproductive performance 2008 - 2011 Breed SED c P value BS a HFL b Lactation length, d 294 285 16 0.029 Milk yield, kg 6,082 5,490 476 0.020 ECM d yield, kg 5,764 5,040 419 0.001 Fat and protein yield, kg 438 378 31
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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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Results RAHMANN G & GODINHO D (Ed.)
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FEC adjusted for dry matter 12000 1
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Conclusions RAHMANN G & GODINHO D (
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Kg liveweight (mean) RAHMANN G & GO
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