§ Mr. PatersonTo ask the Secretary of State for Environment, Food and Rural Affairs whether badgers infected with tuberculosis are capable of depositing infectious tubercular material sufficient to cause infection in cattle on open pasture and other areas to which cattle have access. [141078]
§ Mr. BradshawAlthough it is likely that badgers infected with tuberculosis are capable of infecting cattle, the routes of transmission of Mycobacterium bovis (the causative agent for bovine tuberculosis) from cattle to cattle, and between badgers and cattle, are not fully understood.
The Randomised Badger Culling Trial is designed to provide information on the role of badgers in cattle TB. Other research investigates the pathogenesis of M. bovis in cattle. These form part of a broad programme or research designed to deliver information on improved diagnostics, how TB is transmitted, how TB develops in affected animals, and on the interaction with wildlife.
§ Mr. PatersonTo ask the Secretary of State for Environment, Food and Rural Affairs what badger latrines are; and what relevance they have in the spread of M.bovis to cattle. [141079]
§ Mr. BradshawBadger latrines are areas where the animals habitually defecate. Typically, they comprise several small pits 10 to 20 cm diameter containing badger droppings, usually contained within an area up to five metres across. Latrines are found within and on the periphery of badger social group territories. Badgers also urinate around latrines and smear their scent on the ground. Badgers infected with M. bovis (the causative organism of bovine tuberculosis) may excrete the organism in their faeces and/or urine. Therefore if badger latrines occur on pasture, or in areas frequented by cattle they may pose a risk of M. bovis infection for cattle.
§ Mr. PatersonTo ask the Secretary of State for Environment, Food and Rural Affairs how adult badgers infected with M. bovis transmit the infection to their young. [141080]
§ Mr. BradshawIt is possible that a sow badger infected with M. bovis (the causative organism of bovine tuberculosis) may transmit infection to her cubs through contaminated milk, or by aerosol in the confines of an underground nest chamber. Badgers may also infect each other by bite wounding, either during play fighting or through more aggressive territorial and mating encounters.
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§ Mr. PatersonTo ask the Secretary of State for Environment, Food and Rural Affairs what the estimated incidence of TB in(a) badgers and (b) cattle in England was in the last year for which figures are available. [141082]
§ Mr. BradshawThe last year for which data is available on TB in badgers in England is the period 6 October 1998 to 5 October 1999. Table 1 shows the number of badger carcases tested and found positive for Mycobacterium bovis (the causative organism for bovine tuberculosis) in this period, while Table 2 shows the incidence of TB in cattle for the same period.
Table 1: Badgers tested for M. bovis in England: 6 October 1998 to 5 October 19991 Number and percentage Number of badger carcasses tested 1,038 Number of badger carcasses M. bovis positive 104 Percentage2 10 1 Data from the Randomised Badger Culling Trial (RBCT) and the associated current Road Traffic Accident (RTA) survey is not available. Data is sourced from the previous RTA survey and sources other than from Badger removal operations, and pre-dates the current RTA survey and RBCT. 2 It is not possible to provide incidence rates for TB in badgers in the absence of data about the date badgers became infected.
Table 2: TB herd incidence in England: 6 October 1998 to 5 October 19991 Incidence of TB in cattle Tests on unrestricted herds 28,353 Confirmed new incidents 702 Incidence2 2.5 1 Data downloaded from the State Veterinary Service database on 1 December 2003. 2Percentage.
§ Mr. PatersonTo ask the Secretary of State for Environment, Food and Rural Affairs what conclusions have been drawn on routes of transmission from post-mortem examination of badgers for TB in the past 10 years. [141084]
§ Mr. BradshawPost-mortem examination of badgers is used as part of the process of determining if badgers are infected with Mycobacterium bovis, the causative agent of bovine tuberculosis. Post-mortem findings do not provide a basis for ascribing the source or route of infection. However, the location of visible lesions may be indicative of the route of infection e.g. lesions in the lung tissue would suggest a respiratory route of infection. The distribution of lesions in badgers examined by Defra from 1990–99 indicates that infection may have occurred through the respiratory or oral routes, as well as through infection from bite wounds.
§ Mr. PatersonTo ask the Secretary of State for Environment, Food and Rural Affairs what estimate has been made of the optimum badger population in England; and what assessment has been made of the effect on the local environment of colonies extending beyond the optimum size. [141085]
§ Mr. BradshawNo estimate has been made of the optimum badger population in England, and therefore no estimate can be made of the effect on the local environment of colonies extending beyond the optimum size.
212WDefra is funding a project designed to assess the impact of removing badgers from the ecosystem. The results will shed more light on the ecological interaction of badgers with other species, which share their environment.
§ Mr. PatersonTo ask the Secretary of State for Environment, Food and Rural Affairs what assessment she has made of the percentage of badgers which can reasonably be expected to be killed in a defined area when the culling teams rely solely on trapping. [141088]
§ Mr. BradshawIn the absence of any means to estimate badger populations accurately, either prior to or post culling, it is always going to be difficult to make such assessments. In the randomised badger culling trial, post-culling surveys have indicated that, in the best conditions and allowing for a proportion of trap-shy animals, about 80 per cent. of the population may be culled using cage traps. In less than optimal conditions this figure can be substantially lower.
§ Mr. PatersonTo ask the Secretary of State for Environment, Food and Rural Affairs where the main TB lesions have been found on those badgers which have been subject to a post-mortem examination for TB by or on behalf of her Department, in England in the past 10 years. [141393]
§ Mr. BradshawInformation is available for the period 1 January 1990 to 31 December 1999.
For this period of the 3,682 badgers that were positive for bovine TB, 1,228 displayed gross TB lesions.
The following table classifies the occurrence of the lesion locations.
Location of lesion Occurrence Abdominal nodes 64 Head nodes 330 Chest nodes 532 Skeletal nodes 223 Chest cavity tissues apart from lymph nodes 418 Abdominal cavity tissues apart from lymph nodes 191
§ Mr. PatersonTo ask the Secretary of State for Environment, Food and Rural Affairs what action is taken by the Department when its badger traps are found to be removed or otherwise interfered with. [141972]
§ Mr. BradshawWhen badger traps are found to be removed or otherwise interfered with, traps are replaced or resited or, alternatively, more discrete trapping sites are selected. Incidents of trapping interference are reported to the police.
§ Mr. PatersonTo ask the Secretary of State for Environment. Food and Rural Affairs how many field staff, as full-time equivalents, are employed by her Department both directly and on contract, on randomised badger culling trials; and how many were employed in(a) 2002 and (b) 2001. [141974]
§ Mr. BradshawThe average number of field staff employed on the Randomised Badger Culling Trial in the Veterinary Directorate Wildlife Unit by financial year is as follows.
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Number 1998–99 62 1999–2000 90 2000–01 110 2001–02 136 2002–03 127 2003–04 133 For most of 2001, field staff were reassigned to dealing with FMD. Over the first three years of the Trial contracts to carry out initial Triplet surveying were negotiated with CSL and ADAS and additionally small numbers of staff were deployed from elsewhere in the Department to support major proactive cull operations. Badger culling, however, was always carried out by Wildlife Unit personnel.