The effects of maedi-visna virus infection on productivity in ewes

Dohoo, Ian R.; Heaney, D. P.; Stevenson, R.G.; Samagh, B. S.; Rhodes, Carrie

doi:10.1016/0167-5877(87)90032-8

Cited by 29 publications

(14 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The economic impact that respiratory diseases have in adult sheep has been studied in detail only for Small Ruminant Lentivirus respiratory infections. In this disorder, indirect economic impact in flock productivity has been addressed in studies, in which seropositive ewes had been found with smaller conception rates than seronegative animals within the same flocks (Dohoo et al, 1987), or in which weaning weights of lambs of seropositive ewes were smaller than those of lambs of seronegative ones (Pekelder et al, 1994;Keen et al, 1996;Arsenault et al, 2003). The disease also…”

Section: Significance In Adult Animalsmentioning

confidence: 99%

Significance of respiratory diseases in the health management of sheep

Lacasta

González

Navarro

et al. 2019

Small Ruminant Research

View full text Add to dashboard Cite

 Respiratory diseases of sheep produce a relevant economic impact in ovine industry.  In lambs, the principal adverse effects are related to mortality and poor quality of lambs produced.  In adults, financial losses are related to reduced production of affected sheep, need for early culling and death.  These are multi-faceted diseases and prevention is based on management practices.  Appropriate health measures that improve animal immune response also will help control of the diseases.

show abstract

Section: Significance In Adult Animalsmentioning

confidence: 99%

Significance of respiratory diseases in the health management of sheep

Lacasta

González

Navarro

et al. 2019

Small Ruminant Research

View full text Add to dashboard Cite

show abstract

“…The impact of SRLV-infection on the productivity presented in other studies is controversial; some studies showed a reduction of the productivity (8,19), while in other studies no effect was detected (9,15), or no association between MVV infection and lambing rate was found (1,9). In goats, several studies reported no association between CAEV infection and reduction of productivity and milk quality (18,27).…”

Section: Discussionmentioning

confidence: 88%

Investigation of risk factors associated with infections caused by small ruminant lentiviruses

Barquero

Gómez-Lucı́a

Arjona

et al. 2013

Bulletin of the Veterinary Institute in Pulawy

View full text Add to dashboard Cite

An epidemiological study was conducted to identify risk factors related to small ruminant lentivirus (SRLV) infection in the central region of Spain. Between October 1998 and October 2000, a total of 194 sheep from 10 flocks and 163 goats from three flocks were tested for SRLV antibodies, resulting in 65.5% and 8.0% of seroprevalence, respectively. The relationship between differences in prevalence of SRLV, geographical location of the flock, and possible factors related to the flock that could enhance transmission were studied. Results of multivariable analysis showed an association between SRLV infection and geographical location of the flock and the rearing system. In addition, the differences in the productivity between infected and non-infected animals were explored. The productivity parameters were measured in 62 sheep and 28 goats. All productivity parameters studied (milk production, number of milking days, and lambing rate) appeared to be reduced in the SRLV-seropositive group in both goats and sheep. Even though, these differences were not statistically significant, it seems that animals infected are less productive than these non-infected. Statistical analyses comparing infected and non-infected sheep showed no statistical relationship between SRLV infection and milk quality.

show abstract

“…Indeed, the vast majority of kids in our study were free from the virus because they had been kept clear of contaminated colostrum or milk. Therefore, the epidemiological situation we investigated was more like the situation of HIV-exposed during pregnancy but uninfected children, than like the situation of lambs in meat or wool sheep flocks enrolled in the cited studies [10][11][12][13][14][15][16], since the lambs were constantly exposed to lactogenic transmission of SRLV from their infected dams. We suppose that this fact may explain why some studies have revealed quite strong link between SRLV infection of a dam and impaired growth of the offspring [9,14,15,16].…”

Section: Discussionmentioning

confidence: 99%

“…In this herd goat kids used to be sold to other herds when they turned 3 months and no further follow-up was possible. Most of studies so far carried out in sheep have also covered analogical [16] or even shorter [10,15] period of time. And thirdly, also the reason for which not all the kids were weighed at the same age was purely practical.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, this problem has been extensively studied in ewes affected by maedi-visna disease and results appear to be contradictory. Even though most of studies did not show any link between SRLV infection and decreased lamb productivity [10][11][12][13], some revealed its detrimental effect on body weight and growth rate of lambs at weaning [14][15][16]. In all the aforementioned studies kids and lambs used to be left with mothers for 2-3 months after birth.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of the subclinical small ruminant lentivirus infection of female goats on the growth of kids

et al. 2020

View full text Add to dashboard Cite

A longitudinal observational study was carried out to evaluate the influence of prenatal exposure to small ruminant lentivirus(SRLV)-infected does on the body weight (BWT) of young kids. The study was carried out in years 2001-2017 in the research dairy goat herd. Goats in the herd were regularly serologically tested and individuals showing clinical signs of caprine arthritis-encephalitis (CAE) were promptly culled. As a result all goats enrolled in the study were asymptomatic. Moreover, kids were weaned immediately after birth, fed on bovine colostrum and kept in strict separation from mothers to prevent SRLV lactogenic transmission. Kids were weighed immediately after birth, and then 1-3 times within the first 3 months of life. In total 620 goat kids were weighed at least once, excluding weighing at birth, providing 992 BWT records. The mixed linear model including four variables fitted as random effects (doe, kid, the year of kid's birth and the exact age of a kid at weighing) and four potential confounders fitted as fixed effects (parity, kid's sex, litter size and birth body weight) was developed and showed that BWT was not significantly associated with SRLV serological status of a doe, regardless of the time for which does had been infected before the delivery of the kid (p = 0.242). This study provides strong evidence that kids born to SRLV-infected does grow equally well as kids from uninfected does, provided that the lactogenic viral transmission is prevented by maintaining strict separation between the offspring and mothers. This observation is important for choosing the most optimal strategy of CAE control in a goat herd.

show abstract

The effects of maedi-visna virus infection on productivity in ewes

Cited by 29 publications

References 15 publications

Significance of respiratory diseases in the health management of sheep

Significance of respiratory diseases in the health management of sheep

Investigation of risk factors associated with infections caused by small ruminant lentiviruses

The effect of the subclinical small ruminant lentivirus infection of female goats on the growth of kids

Contact Info

Product

Resources

About