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Biomedical subjects

D M Broom

Publications and source records attributed to D M Broom.

15 recordsLinked to original sources
PubMed1991

Animal welfare: concepts and measurement.

The term "welfare" refers to the state of an individual in relation to its environment, and this can be measured. Both failure to cope with the environment and difficulty in coping are indicators of poor welfare. Suffering and poor welfare often occur together, but welfare can be poor without suffering and welfare should not be defined solely in terms of subjective experiences. The situations that result in poor welfare are reviewed in this study with special reference to those in which an individual lacks control over interactions with its environment. The indicators of poor welfare include the following: reduced life expectancy, impaired growth, impaired reproduction, body damage, disease, immunosuppression, adrenal activity, behavior anomalies, and self-narcotization. The uses of measures of responsiveness, stereotypies, and animal preferences in welfare assessment are discussed. The need to make direct measurement of poor welfare as well as to use sophisticated studies of animal preferences is emphasized.

Adaptation, Psychological↗
PubMed1990

Limb bone strength and movement in laying hens from different housing systems.

Walking and bouts of wing movement performed by 61-week-old ISA brown laying hens which had been taken from one batch of eggs and then kept in three different housing systems which allowed a gradation in spatial freedom, were recorded. After slaughter the breaking strengths of the humerus and tibia of birds from each system were measured. Birds from battery cages exhibited the fewest limb movements and had the weakest bones, their humeri having only 54 per cent of the strength of those of birds from a perchery. Birds from the Elson terrace system were heavier and had a stronger tibia than cage birds. Compared with perchery birds, terrace birds had weaker humeri and also performed fewer wing movements. The results indicate that the amount of movement possible for laying hens in battery cages was insufficient to avoid levels of osteopenia and consequent bone fragility much greater than in birds kept in the perchery and Elson terrace systems.

Animal Feed↗
PubMed1987

The veterinary relevance of farm animal ethology.

The world expects veterinary knowledge to encompass all aspects of the lives of animals. These include their management and welfare, not just their diseases. Modern research into behaviour is relevant to practical veterinary work, such as animal handling and disease diagnosis, and also to general management and welfare. Hence, all veterinary courses should include instruction in behaviour and those involved in veterinary work should be aware of new developments in the subject.

Animal Husbandry↗
PubMed1983

Cow-calf and sow-piglet behaviour in relation to colostrum ingestion.

The declines in both production of immunoglobulin (lg) by mothers and absorption efficiency by young make it desirable for calves to ingest an adequate amount of colostrum by 6-12 h and piglets to do so by 4-8 h. In cattle, suckling attempts may be delayed by weakness of the cow or calf due to difficult calving, injury, deformities or disease. The incidence of attacking or avoiding calves is greater among heifers than among older cows and rejection is occasionally a serious problem. Amongst dairy cattle, the major factor leading to inadequate colostrum intake is difficulty in finding a teat or suckling from it because the udder is pendulous and the teats are fat. Calves of cows with pendulous udders, and this included most older cows, failed to suck within 6 h and obtained inadequate lg levels unless put to the teat. Absorption of lg may be more efficient if the mother is present. Some attacking of piglets by gilts is common and injuries to piglets due to sow attacks may be a serious problem. Injuries, deformities, general weakness or becoming trapped in part of the farrowing pen reduce the chances that a piglet will suckle adequately. Agalactia and competition for teats result in some piglets in larger litters failing to suckle. Fighting for colostrum producing teats peaks 2 h after the birth of the first piglet so later born piglets must obtain less of the lg produced if farrowing is prolonged. Group farrowing and group calving increase the chances that some piglets or calves will fail to obtain adequate colostrum.

Animal Population Groups↗
PubMed1979

The period between birth and first suckling in dairy calves.

The period between birth and first suckling was recorded for 82 dairy calves. 11 per cent of heifers' calves and 46 per cent of cows' calves had not suckled by 6 h after birth. All calves, whether suckling spontaneously or put to the teat at 6 hr, had adequate 48 h total serum immunoglobulin levels.

Animals↗
PubMedDate not supplied

Interactions between cattle and badgers at pasture with reference to bovine tuberculosis transmission.

The normal behaviour of badgers, as described here, would not result in direct transmission of tuberculosis from badgers to cattle via air expired by badgers or via bodily contact. All activities of wild badgers in cattle fields at three different sites were observed at night for a total of 359 h. In addition, all activities of pairs of wild caught badgers were observed in a 0.5 ha enclosure with an artificial sett on 20 nights when cattle were present. Badger foraging in cattle fields was infrequent during dry conditions and variable at other times. Clover fields were preferred to grass pastures in two autumnal studies and under dry conditions the badgers did not prefer to forage on short pasture. Badgers consistently avoided close contact with cattle by changing routes from sett to foraging site and by foraging much less in areas of fields occupied by cattle. When foraging they preferred to remain at least 10-15 m from cattle and they avoided compact groups of cattle more than individuals. Some cattle would move towards badgers, especially if they were carrying out unusual behaviour, but badgers fled rapidly from every approach. In all potential encounters badgers were able to keep at least 2-3 m from approaching cattle. Badgers in the artificial sett delayed entering the enclosure if cattle were within 15 m of the entrance. When cattle were managed on a strip-grazing (rotational) system the whole area which they occupied was avoided by the badgers. However, badgers came closer to individual cattle and foraged in areas grazed by the cattle more if the cattle were set-stocked. If cattle are managed so that they are concentrated in a small area (rotational) system the risk of disease transmission is minimized because they are less likely to encounter badgers or their fresh products than are cattle managed on a large area (set-stocked) system.

Animals↗
PubMedDate not supplied

Responses of dairy cows to badger urine and faeces on pasture with reference to bovine tuberculosis transmission.

Grazing cattle were observed when they encountered badger urine or faeces which, in all but the first study, came only from badgers which were not infected with bovine tuberculosis. The faeces were very strongly avoided and there was generally a strong avoidance of ingestion of badger urine. There was no evidence that cattle were attracted to badger latrines in an area where some infected badgers were present and cows actively avoided faeces up to 28 days old which was placed on grass turves or on pasture. 99.3% of cows took no bites from small grass plots contaminated with faeces and 88.7% of cows took no bites from urine-treated plots. There was generally avoidance of pasture treated with badger urine up to 14 days old. However, two cows out of 240 were willing to graze close to faeces and seven out of 240 were willing to graze near urine. Contaminated herbage was eaten most when attractive herbage became scarce. Wet weather did not reduce the strength of avoidance of urine. Some cows responded to badger urine, and to a lesser extent to faeces, by more sniffing, particularly when herbage was scarce. The odour of faeces, and sometimes that of urine, often resulted in the ejection of mouth contents. As a consequence of their avoidance of badger faeces and urine, the vast majority of cows are unlikely to contract tuberculosis from infected badgers by ingestion. Most cows totally avoid badger products so they are unlikely to be infected via inhalation. However, the small minority of unselective cows must be more at risk and this finding warrants further investigation.

Animals↗