7 research outputs found

    Effect of cleaning /disinfection strategies on helminth infections in finishing pigs

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    Ascaris suum is the most prevalent helminth on organic pig farms (Carstensen et al., 2002) and is transmitted mainly via the faeces. The use of anthelmintics does not fit in the organic principles and preventive measures are promoted. This project focused on assessing the efficacy of a cleaning protocol for the dunging area of pens on Ascaris s. transmission to pigs. In 4 batches with 8 identical pens for 15 pigs each (n=480 pigs) 6 pigs per pen were orally infected with Ascaris s. The other pigs can be earliest infected at 10 weeks and half of the pens were thoroughly cleaned at that time. Affected livers and egg counts in the manure had to show if this cleaning protocol keeps the non infected animals free of Ascaris s. The results show no effect of the cleaning protocol on the non infected pigs. These pigs had 57% damaged livers in both treatment and 50% had positive egg counts in the manure. The conclusion is that pen hygiene does not contribute to a reduction of Ascaris s. infections

    Effect van een kruidenextract op berengeur, agressief en seksueel gedrag bij biologische varkens

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    An experiment with 273 entire males was conducted on an organic pig farm. Half of these males received a herbal extract in the drinking water to reduce mounting behaviour and boar taint. The herbal extract did not affect sexual behaviour and boar taint. Only two carcasses (0,7%) had a typical boar taint. However a complete change towards non castration for organic pigs is not yet applicable partly because of international trade difficulties. A follow up study will be prepare

    Kaart, gecopieerd uit de groote kaart van Rhynland, waar op de geconcipieerde bedyking en droogmaking van de gecombineerde Nieukoopsche Plas, en plassen onder Amstelland en het Sticht, ten Noord-Oosten van Zevenhoven, met de ring- en- binnen dyken, stand

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    Op deze kaart staat de Nieuwkoopse Plas als droogmakerij afgebeeld. De metingen voor de kaart, zo vermeldt de titelcartouche, werden gedaan door Klaas Vis en Jan Switser in de jaren 1788 en 1789. De kaart draagt de resolutiedatum van 23 juli 1789. Deze datum verwijst naar het besluit van de Staten van Holland en West-Friesland om toestemming te verlenen voor het inpolderen van de plas. Vele geprojecteerde molens, bedoeld voor het droogmaken van de Nieuwkoopse Plas zijn op de kaart weergegeven. De kaart is in 1791 gepubliceerd en gegraveerd door Leonard Schenk Jansz. (1732-1800)
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