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| Fall, Nils; Emanuelson, Ulf; Martinsson, Kjell; Jonsson, Simon. |
| Our aim was to compare udder health in groups of organically and conventionally managed cows, using data from a longitudinal study in a Swedish dairy-research farm. Management of the groups was identical except for feed composition and the feeding regimen. Our dataset included all lactating cows calving from 1 September 1990 to 31 August 2001 (145 organically and 151 conventionally managed cows). Udder health was assessed by the geometric average somatic-cell count (SCC) within 150 days after calving, by the number of monthly SCC tests >200,000 cells/ml within 150 days after calving and by presence of lactations with veterinary-treated cases of clinical mastitis. The effect of animal group was analysed by multivariable linear, Poisson and... |
| Tipo: Journal paper |
Palavras-chave: Dairy cattle; Health and welfare. |
| Ano: 2008 |
URL: http://orgprints.org/25064/1/pvm_83_186_195.pdf |
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| Jonsson, Simon. |
| This report was presented at the UK Organic Research 2002 Conference. In order to develop organic dairy production a system study called “The Öjebyn Project” was started in 1990. Öjebyn is a research station of The Swedish University of Agricultural Sciences in northern Sweden. There is 104 hectares of arable land; 58 hectares are grown organically and 46 hectares are grown conventionally. The feed produced on the farm was fed to around 50 dairy cows in each system. There has been a crop rotation of six years and a careful handling of farmyard manure and urine from the dairy cows. The crop yields have been recorded for twelve years as have the quality of each crop in terms of energy, protein and mineral content (P, K, Ca, and Mg). The difference in yield... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Production systems; Crop husbandry. |
| Ano: 2002 |
URL: http://orgprints.org/8270/1/Jonsson_crop_yields_Ojebyn_project.pdf |
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| Bystrom, Sara; Jonsson, Simon; Martinsson, Kjell. |
| This report was presented at the UK Organic Research 2002 Conference. A study (the Öjebyn Project) was conducted to determine differences between organic and conventional dairy farming systems. Comparisons of feed intake, milk production, live weight (LW), feed efficiency and animal health were conducted, based on records from 145 dairy cows (238 parities). A lower daily metabolisable energy (ME) intake, lower milk yield and a higher protein content were recorded in the organic herd during the first ten weeks of lactation. No differences were recorded between the systems in either average total DM intake or efficiency of feed conversion, calculated as MJ of feed/kg of energy-corrected milk (ECM). There were a trend to lower LW change and better health in... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farming Systems; Dairy cattle; Feeding and growth. |
| Ano: 2002 |
URL: http://orgprints.org/8390/1/bystrom_organic_conventional_dairy_ojebyn.pdf |
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| Fall, DVM Nils; Emanuelson, Professor Ulf; Martinsson, Kjell; Jonsson, Simon. |
| Our aim was to compare udder health in groups of organically and conventionally managed cows, using data from a longitudinal study in a Swedish dairy-research farm. Management of the groups was identical except for feed composition and the feeding regimen. Our dataset included all lactating cows calving from 1 September 1990 to 31 August 2001 (145 organically and 151 conventionally managed cows). Udder health was assessed by the geometric average somatic-cell count (SCC) within 150 days after calving, by the number of monthly SCC tests >200,000 cells/ml within 150 days after calving and by presence of lactations with veterinary-treated cases of clinical mastitis. The effect of animal group was analysed by multivariable linear, Poisson and... |
| Tipo: Journal paper |
Palavras-chave: Health and welfare. |
| Ano: 2008 |
URL: http://orgprints.org/13099/1/PVM%2C_Fall_et_al.%2C2008.pdf |
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