Het 'VELD'-project, addendum. Uitwerking juli en augustus 2003

In een gebied van 3x3 km rond het dorp Vragender in de Achterhoek zijn uitgebreid metingen van ammoniakconcentraties (NH3) gedaan en emissies berekend aan de hand van in detail geregistreerde agrarische activiteiten. Op basis van deze emissies zijn modelberekeningen gedaan met het OPS-STe (korte termijn) verspreidingsmodel.VRO

Claw and limb disorders in 12 Norwegian beef-cow herds

<p>Abstract</p> <p>Background</p> <p>The main aim of the study was to assess the prevalence of claw and limb disorders in Norwegian beef-cow herds.</p> <p>Methods</p> <p>Twenty-six herds with ≥15 cow-years were selected by computerized systematic assignment from the three most beef cattle-dense regions of Norway. The study population consisted of 12 herds with 28 heifers and 334 cows. The animals were trimmed and examined once by claw trimmers during the late winter and spring of 2003. The seven claw trimmers had been taught diagnosing and recording of claw lesions. Environment, feeding and management routines, age and breed, culling and carcass characteristics were also recorded.</p> <p>Results</p> <p>Lameness was recorded in 1.1% of the animals, and only in hind claws. Pericarpal swellings were recorded in one animal and peritarsal lesions in none. In total, claw and limb disorders including lameness were recorded in 29.6% of the animals, 4.1% with front and 28.2% with hind limb disorders, respectively. Most lesions were mild. Laminitis-related claw lesions were recorded in 18.0% of the animals and infectious lesions in 16.6%. The average claw length was 84 mm in front claws and 89 mm in hind claw. Both laminitis-related and infectious claw lesions were more prevalent with increasing age. Carcasses from animals with claw and limb disorders were on average 34 kg heavier than carcasses from animals without such disorders (p = 0.02). Our results also indicate association between some management factors and claw lesions.</p> <p>Conclusion</p> <p>The study shows that the prevalence of lameness was low in 12 Norwegian beef-cow herds compared to beef-cattle herds in other countries and also that there were less claw and limb disorders in these herds compared to foreign dairy-cattle herds. The prevalence of lameness and white-line fissures was approximately the same as in Norwegian dairy herds whereas less dermatitis, heel-horn erosions, haemorrhages of the sole and the white line and sole ulcers were recorded.</p

VELD-project: a detailed inventarisation of ammonia emissions and concentrations in an agricultural area

During the period June 2002 till September 2003 the pilot project VELD was carried out in the vicinity of the village of Vragender, in the eastern part of the Netherlands. All agricultural activities were administrated and the resulting ammonia emission was calculated. The ammonia concentration in the air was measured at 50 sites within the Vragender pilot area. Comparison of calculated and measured ammonia concentrations in general revealed a good correlation. However, during the period of manure application in spring 2003 a large discrepancy was found. Main reasons for this is an underestimate of the ammonia emissions during manure application under dry and sunny weather conditions and a reduced dry deposition of ammonia during the manure application period.In een gebied van ca 9 km2 rondom Vragender (Gld.) is gedurende de periode juni 2002 tot september 2003 het pilot project VELD uitgevoerd. Enerzijds werden van alle agrarische activiteiten in het gebied de ammoniakemissie bepalende factoren in kaart gebracht en daaruit de ammoniakemissie berekend. Anderzijds is op 50 locaties in het gebied de ammoniakconcentratie in de lucht gemeten. Vergelijking tussen berekende ammoniakconcentraties op basis van de emissies en gemeten ammoniakconcentraties leverde in het algemeen een goede overeenkomst op. Echter tijdens de mestaanwending in het voorjaar 2003 werd een grote discrepantie gevonden..Belangrijkste redenen hiervoor zijn een onderschatting van de emissies door mestaanwending tijdens het droog en zonnig voorjaarsweer en een vermindering van de droge depositie van ammoniak ten tijde van de aanwending

VELD-project: a detailed inventarisation of ammonia emissions and concentrations in an agricultural area

E-mail: [email protected] - Tel: +31 317 475 024In een gebied van ca 9 km2 rondom Vragender (Gld.) is gedurende de periode juni 2002 tot september 2003 het pilot project VELD uitgevoerd. Enerzijds werden van alle agrarische activiteiten in het gebied de ammoniakemissie bepalende factoren in kaart gebracht en daaruit de ammoniakemissie berekend. Anderzijds is op 50 locaties in het gebied de ammoniakconcentratie in de lucht gemeten. Vergelijking tussen berekende ammoniakconcentraties op basis van de emissies en gemeten ammoniakconcentraties leverde in het algemeen een goede overeenkomst op. Echter tijdens de mestaanwending in het voorjaar 2003 werd een grote discrepantie gevonden..Belangrijkste redenen hiervoor zijn een onderschatting van de emissies door mestaanwending tijdens het droog en zonnig voorjaarsweer en een vermindering van de droge depositie van ammoniak ten tijde van de aanwending.During the period June 2002 till September 2003 the pilot project VELD was carried out in the vicinity of the village of Vragender, in the eastern part of the Netherlands. All agricultural activities were administrated and the resulting ammonia emission was calculated. The ammonia concentration in the air was measured at 50 sites within the Vragender pilot area. Comparison of calculated and measured ammonia concentrations in general revealed a good correlation. However, during the period of manure application in spring 2003 a large discrepancy was found. Main reasons for this is an underestimate of the ammonia emissions during manure application under dry and sunny weather conditions and a reduced dry deposition of ammonia during the manure application period.VROMLNVIP