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| Registros recuperados: 42 | |
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| Zeltner, Esther; Hirt, Helen. |
| On farm research is well established in organic farming. The holistic approach considers the complexity of a farm and the findings will be implemented immediately. As the experiments are often performed on single farms the results are difficult to transfer to others. Controlled experiments on group level with representative samples investigate single factors and lead to reliable and well-founded results. However, they are often far away from implementation. Applied research requires interplay of on farm research and controlled experiments. A series of ethological research work should show how this interplay may take place. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Poultry. |
| Ano: 2005 |
URL: http://orgprints.org/6462/1/Zeltner%2D2005%2Dhens%2Dto%2Dhen%2Drun.pdf |
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| Zeltner, Esther; Hirt, Helen. |
| On-farm research is well established in organic farming. The holistic approach considers the complexity of a farm, and the findings can be imple-mented immediately. As the experiments are often performed on single farms the results are difficult to transfer to other locations. Controlled experiments with animals on group level with representative sam-ples investigate single factors and lead to reliable and well-founded results. However, they are often far away from implementation into agricultural practise. Applied research requires an interplay of on farm research and controlled experiments. A series of ethological research work at research institute of organic agriculture in Switzerland should show how this interplay may take place. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Poultry; Health and welfare. |
| Ano: 2006 |
URL: http://orgprints.org/7235/1/ZeltnerabstractOdense.doc |
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| Zeltner, Esther; Hirt, Helen. |
| Problemstellung/Ziele: Bereits jetzt werden in der Schweiz etwa die Hälfte der Legehennen mit Grünauslauf gehalten. Meist ist jedoch nur ein kleiner Teil der Tiere draussen und diese befinden sich hauptsächlich im stallnahen Bereich (Hirt et al. 2000). Durch die ungleichmässige Landnutzung besteht ein erhöhter parasitärer Druck auf die Die genetische Herkunft der Tiere beeinflusst verschiedene Faktoren. Es konnte festgestellt werden, dass verschiedene Hybriden unterschiedliches Erkundungsverhalten haben (Klein et al. 2000). Craig, et al. (1983) fanden Hybridunterschiede in der Nervosität und im Furchtverhalten. Die ängstlichere Linie hatte auch grössere Gefiederschäden. Beim Federpicken konnten ebenfalls je nach Hybrid eine unterschiedliche Häufigkeit... |
| Tipo: Book chapter |
Palavras-chave: Health and welfare; Poultry; Breeding and genetics. |
| Ano: 2003 |
URL: http://orgprints.org/2738/1/zeltner%2Dhirt%2D2003%2Dauslaufnutzung.pdf |
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| Zeltner, Esther; Hirt, Helen. |
| 1. This study examined whether a free range with roofed boxes with sand to structure the hen run had an effect on the numbers of hens going outside and on the distribution of the hens in the hen run. 2. On a poultry farm with 8 flocks of laying hens of roughly 500 birds per flock, each flock was observed with and without roofed boxes with sand. 3. There was no difference in the number of hens on free range with and without roofed boxes but there was an influence on the distribution. 4. In free range with structures there was a higher percentage of the hens outside in the furthest quarter where the structures were located. 5. We conclude that structures in the free range have an effect on the distribution of laying hens. |
| Tipo: Journal paper |
Palavras-chave: Poultry; Health and welfare. |
| Ano: 2003 |
URL: http://orgprints.org/2784/1/zeltner%2D2003%2Dbritish%2Dpoultry%2Dscience.pdf |
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| Bieber, Anna; Seidel, Kathrin; Wyss, Gabriela S.; Maurer, Veronika; Zeltner, Esther. |
| In order to test the effect of organic vs. conventional diets on fertility traits, we conducted an on-farm study with female rabbits. Eight groups of seven to eight female rabbits kept in systems with litter were fed ad libitum with either organic or conventional pellets. Offspring was weaned with approx. 28 days. In the first series analysed, the conception rate was higher in the conventional groups. Diet type had no significant influence on that trait. Nevertheless, a significant influence of diet on litter size was found: organically fed female rabbits produced more offspring per litter. The organic groups also showed higher rates of weaned animals, despite of a slightly higher mortality of offspring in these groups, but differences for both... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health Feeding and growth. |
| Ano: 2009 |
URL: http://orgprints.org/14097/1/Bieber_14097.pdf |
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| Gnan, Renate; Hirt, Helen; Zeltner, Esther. |
| Imitated natural light conditions during the artificial incubation may influence pullets' behaviour in being adapted to the diurnal rhythm. To study these effects, eggs were set in a commercial incubator either in the dark control or under full spectrum light tubes (Philips TL95, 36 watt). To imitate the light changes by a clucking hen, the eggs were exposed to light for twelve hours a day with a light-intensity of 20 lux. After six hours there was a step-up in light intensity to 1000 lux for 20 minutes. After hatching, the chickens were reared in paired groups under BIO SUISSE organic standards. Each group, containing 1000 pullets, was observed at the age of 2, 4, 8 and 10 weeks in 5 trials. Several categories of behaviour, activity and the diurnal rhythm... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Poultry; Health and welfare. |
| Ano: 2005 |
URL: http://orgprints.org/3619/1/3619.pdf |
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| Zeltner, Esther; Hirt, Helen. |
| Introduction Organic egg farmers mainly rely on the same hybrids, breeding techniques and production schemes as conventional egg producers. This includes annual replacement of the laying hens. However, from an ethical point of view a longer life for laying hens is desired, not only because the hens can be used for a longer period but also less male chicks would have to be killed at one day of age. Birds have to moult their plumage from time to time. During this time they hardly take in any food and stop laying. This laying interval presents a recuperation period for the egg producing organs of the hen. After moulting, egg production is again higher and the egg quality is improved. In large flocks of laying hens moulting has to be induced to prevent social... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Poultry. |
| Ano: 2005 |
URL: http://orgprints.org/6449/1/Zeltner%2D2004%2Dmoulting.pdf |
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| Zeltner, Esther; Hirt, Helen. |
| A longer life for laying hens is desired from an ethical point of view. Not only because the hens can be used for a longer period but also less male chicks would have to be killed at the age of one day. In large flocks of laying hens moulting has to be induced to prevent social instability in the flock. In this study, a method was investigated, to moult laying hens without too much stress for the hens. The chosen method with daily access to a bad weather hen run had no detectable negative effect on the behaviour of the hens. The moulting succeeded in improving egg quality and plumage condition. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Poultry; Breeding and genetics. |
| Ano: 2005 |
URL: http://orgprints.org/3620/1/3620.pdf |
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| Zeltner, Esther. |
| In biodynamic and organic agriculture mostly the same strains of laying hens as in conventional agriculture are used. These strains require feed with a high nutrition level to tap the full potential of their genetic. When this feed is not available it may lead to health problems and ethological interferences as well as to a deficiency of performance. In this study, four potential adequate strains are evaluated and compared with a commercial strain using health and ethological parameters as well as characteristics of performance under biodynamic conditions. After one laying period the laying performance of Amberlik, Hyline, Sperber and Sussex was high but only the plumage condition of Sussex was acceptable. Therefore this strain will be used for further... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Poultry; Breeding and genetics; Feeding and growth. |
| Ano: 2008 |
URL: http://orgprints.org/12203/1/Zeltner_12203_ed.doc |
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| Zeltner, Esther. |
| Mit einer Legepause kann die Nutzungsdauer von Legehennen verlängert werden. In grossen Herden wird die Legepause mit Lichtreduktion und Änderungen bei der Fütterung ausgelöst. In der Schweiz ist im Biolandbau, im Gegensatz zu Deutschland, die künstliche Auslösung der Legepause z. Z. nicht erlaubt, weil dies für die Hühner eine Belastung darstellt. |
| Tipo: Journal paper |
Palavras-chave: Poultry. |
| Ano: 2004 |
URL: http://orgprints.org/6459/1/Zeltner%2D2004%2DLegepause.pdf |
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| Zeltner, Esther; Hirt, Helen. |
| Einleitung In der Schweiz werden mehr als die Hälfte der Legehennen mit Grünauslauf gehalten. Doch die Ausläufe werden oft nicht wie gewünscht genutzt. Viele Tiere bleiben im Stall oder im Wintergarten und im stallnahen Bereich kommt es zu einer Übernutzung des Grünauslaufes. Um die Grasnarbe zu schonen hat sich ein Management mit Wechselweide bewährt. Da dies besonders bei mehreren nebeneinander liegenden Herden nicht einfach zu realisieren ist, entstehen oft enge Gänge. Im folgenden Versuch wurde untersucht, ob die Auslaufnutzung sich ändert, wenn die Hühner zuerst durch einen Tunnel auf die eigentliche Weide gelangen müssen und ob sie sich die Hühner anders verteilen als bei direktem Weidezugang. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Poultry. |
| Ano: 2004 |
URL: http://orgprints.org/6466/1/Zeltner%2D2004%2DTunnel.pdf |
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| Zeltner, Esther; Hirt, Helen; Hauser, J.. |
| In organic agriculture, hens are kept in free range systems. A free range is an enrichment for the hens and brings several advantages for them. Laying hens may show behavioural elements that are not possible in a poultry house. For instance, sunbathing behaviour is only shown in direct sunlight and not in artificial light (Huber, 1987). Hens spend 35.3-47.5% of their time with food searching (Fölsch and Vestergaard, 1981) and, in natural habitats, invertebrate food appears to be an importnat addition to the diet (Savory et al. 1978). Free range systems may also have an influence on animal health and product quality. Lopez-Bote et al. (1998) suggested that some constituents of grass might be of interest for the production of eggs rich in (n-3) fatty acids.... |
| Tipo: Book chapter |
Palavras-chave: Poultry; Health and welfare. |
| Ano: 2004 |
URL: http://orgprints.org/3159/1/zeltner%2Det%2Dal%2D2004%2Dhow%2Dto%2Dmotivate%2Dlaying%2Dhens.pdf |
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| Registros recuperados: 42 | |
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