Time trends and epidemiological patterns of perinatal lamb mortality in Norway

Holmøy, Ingrid Hunter; Waage, S.

doi:10.1186/s13028-015-0155-6

Cited by 12 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Methodological approaches have variously relied on veterinary student-administered 22 or farmeradministered questionnaires, 23 farmer-performed neonatal lamb postmortem examinations 24 or a combination of veterinary or lock-manager diagnostic postmortem procedures 25 to determine mortality or cause-speciic mortality rates. Terminology such as 'neonatal' or 'perinatal' also vary between studies [24][25][26][27][28] as have rate measures such as 'mortality between scanning and sale' 29 and 'mortality between 24 hours and weaning'. 25 Identiication of a suitable rate measure in such studies is challenging as the denominator is constantly changing during the lambing season.…”

Section: Discussionmentioning

confidence: 99%

Descriptive analysis of ovine mortality in sentinel sheep flocks in Ireland

Murray

Fagan²,

Murphy³

et al. 2019

Veterinary Record

View full text Add to dashboard Cite

BackgroundStudies of sheep mortality or cause-specific mortality, in Ireland or internationally, are relatively scarce but are important in presenting baseline levels and changing trends of endemic disease. This study assessed sheep mortality and cause-specific mortality in 33 sentinel sheep flocks in Ireland.MethodsSentinel flocks were requested to submit carcases of all sheep that died to the regional veterinary laboratories (RVLs) of the Department of Agriculture, Food and Marine during a calendar year (2016). Postmortem examinations were performed on 1247 submissions to Athlone, Kilkenny and Sligo RVLs.ResultsThe median overall submission rate was 13.8 per cent (range 2.5 per cent–35.8 per cent) per adult female sheep in the flock in January 2016. The median fetal, perinatal, lamb and adult submissions per adult female sheep in the flock in January 2016 were 2.1 per cent (0.0 per cent–15.2 per cent), 3.5 per cent (0.0 per cent–20.0 per cent), 3.0 per cent (0.0 per cent–12.4 per cent) and 2.8 per cent (0.8 per cent–7.1 per cent), respectively. The frequency of detection of categories of postmortem diagnoses in fetuses, perinates, lambs and adults are presented.ConclusionsComparisons with existing passive surveillance findings reflect some differences in the relative frequency of detection of certain categories of disease suggesting that sentinel flock surveillance could usefully supplement existing passive animal disease surveillance activities for ovine disease.

show abstract

Section: Discussionmentioning

confidence: 99%

Descriptive analysis of ovine mortality in sentinel sheep flocks in Ireland

Murray

Fagan²,

Murphy³

et al. 2019

Veterinary Record

View full text Add to dashboard Cite

show abstract

“…For both sheep and goats, the variation in the time periods covered by different studies was too great to allow direct comparisons. In sheep, two papers noted that stillbirth and perinatal mortality rates were higher than at any age (Holmoy & Waage, 2015); Voigt et al, 2019), while other authors report the largest proportion of mortalities occurred within 24 hours of birth (Binns et al, 2002), or within first week (Gokce & Erdogan, 2009;Gokce et al, 2013;Khan et al, 2006). Holmoy et al (2017) reported that 80% of neonatal lamb mortalities occurred within the first two days of life.…”

Section: Risk Of Bias Of Included Studiesmentioning

confidence: 99%

Refining livestock mortality indicators: a systematic review

2021

View full text Add to dashboard Cite

Background: Livestock mortality impacts farmer livelihoods and household nutrition. Capturing trends in livestock mortality at localised or national levels is essential to planning, monitoring and evaluating interventions and programs aimed at decreasing mortality rates. However, livestock mortality data is disparate, and indicators used have not been standardised. This review aims to assess livestock mortality indicator definitions reported in literature, and define the ages where mortality has greatest impact. Methods: A systematic review was conducted, limited to articles focussed on mortality of cattle, sheep and goats. Peer-reviewed articles in Web of Science until year 2020 were assessed for inclusion of age-based definitions for mortality indicators and data on age distribution of mortality. Indicator definitions for each species were collated and similar terms and age groups most targeted were compared. The cumulative distribution of age at mortality was compared across studies graphically where possible; otherwise, age patterns for mortality were collated. Results: Most studies reported mortality risk rather than rate, and there was little agreement between indicator definitions used in the literature. The most common indicators reported were perinatal and neonatal mortality in cattle, and for perinatal, neonatal and pre-weaning mortality indicators for sheep and goats. Direct comparison of age distribution of mortality was only possible for cattle, which found that approximately 80% of all mortalities within the first 12 months had occurred by six months of age. A significant finding of the study is the variation in age groups for which mortality is reported, which impedes the comparison of mortality risk across studies, particularly for sheep and goats. Conclusions: This study demonstrates the importance and value of standardising mortality risk indicators for general use, including a young stock mortality risk indicator measuring mortality in the highest risk period of birth to six months of age in cattle, sheep and goats.

show abstract

“…Lamb survival rates to weaning across 29 studies clearly indicate triplet lambs (mean value across studies 67.5%) have lower survival than their singleton (89.5%) and twin (85.5%) counterparts (Table 2). Most lambs die within three days of birth but, triplets can have higher loss rates past this period (Kleeman et al 1993;Hinch and Brien 2014;Holmøy et al 2014Holmøy et al , 2017Holmøy and Waage 2015;Refshauge et al 2016), presumably driven by a mismatch in milk supply and demand (see later section). Ferreira et al (2015) reported that when artificially reared, after one day of age, triplet survival did not differ from singletons and twins.…”

Section: Survivalmentioning

confidence: 99%

Triplet lambs and their dams – a review of current knowledge and management systems

Kenyon

Fraga

Blumer

et al. 2019

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

Triplet-bearing ewes and their lambs have the potential to improve flock productivity however, the lack of robust information on optimal nutrition and management is limiting their performance. In comparison to twins, the triplet lamb is; lighter, more metabolically challenged, has lower body temperature, and receives less colostrum and milk which combined results in lower survival rates and weaning weights. While scientifically based management guidelines are available for singletons and twins, guidelines are generally lacking for triplets. Although there is some knowledge on the impacts of nutrition, further studies are required to examine the impacts of varying feeding regimens in pregnancy and lactation, across the body condition range. Characterising the impacts of shelter and other paddock factors, stocking rate, mob size and human intervention would also be of benefit. Future studies must be large enough to allow for evaluation of lamb survival and litter birth weight variation.

show abstract

Time trends and epidemiological patterns of perinatal lamb mortality in Norway

Cited by 12 publications

References 26 publications

Descriptive analysis of ovine mortality in sentinel sheep flocks in Ireland

Descriptive analysis of ovine mortality in sentinel sheep flocks in Ireland

Refining livestock mortality indicators: a systematic review

Triplet lambs and their dams – a review of current knowledge and management systems

Contact Info

Product

Resources

About