Impact of the subclinical small ruminant lentivirus infection of female goats on the litter size and the birth body weight of kids

Nalbert, Tomasz; Czopowicz, Michał; Szaluś‐Jordanow, Olga; Witkowski, M.; Witkowski, Lucjan; Słoniewska, Danuta; Reczyńska, Daria; Bagnicka, Emilia; Kaba, Jarosław

doi:10.1016/j.prevetmed.2019.02.011

Cited by 5 publications

(7 citation statements)

References 24 publications

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“…We believe that these facts make our conclusions highly trustworthy. Along with our previous observations regarding the lack of influence of SRLV infection of a doe on the litter size and the birth body weight of kids [33], this study provides important knowledge of the impact of CAE on goat farming. Our results indicate that using infected mothers for breeding is very unlikely to have negative impact on the development of kids born to them provided that kids are not exposed to lactogenic infection.…”

Section: Discussionsupporting

confidence: 59%

“…In our previous study [37] the birth body weight turned out to contribute to the growth of kids during the first four months of life, which is even longer than the time period covered by this study. In many former studies male kids have been born heavier [33,38] and have remained heavier for the entire life [39,40]. On the other hand, even though singletons are usually heavier than kids from multiple litters at birth [33,41] and at weaning [40], in our study kids from litters counting more than one individual caught up with singletons not later than at the age of two months.…”

Section: Plos Onementioning

confidence: 49%

“…In many former studies male kids have been born heavier [33,38] and have remained heavier for the entire life [39,40]. On the other hand, even though singletons are usually heavier than kids from multiple litters at birth [33,41] and at weaning [40], in our study kids from litters counting more than one individual caught up with singletons not later than at the age of two months. As a result litter size turned out to be an insignificant confounder in the MLM.…”

Section: Plos Onementioning

confidence: 49%

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

et al. 2020

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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.

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Section: Discussionsupporting

confidence: 59%

Section: Plos Onementioning

confidence: 49%

Section: Plos Onementioning

confidence: 49%

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

et al. 2020

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“…Total Infected animals, including PCR and ELISA, showed lower lambing sizes and a trend to higher birth body weight. Despite one variable possibly being related to the other, since higher lambing size implies lower birth weights (40), previous studies relate SRLV with lower birth weights (18) or rather did not find association (16,17,19) likely due to the low epidemiologic importance of natural in utero transmission (41). In contrast, serological methods associated SRLV seropositivity with lower birth body weight and with lambing size depending on the data analysis performed.…”

Section: Discussionmentioning

confidence: 96%

“…Quantification of productive losses due to SRLV infection remains controversial, while some studies claim for a role of SRLV infection in decreasing quantity and quality of animal productions in both dairy and meat farms (12)(13)(14), others have revealed no differences between seronegative and seropositive animals (15)(16)(17)(18)(19). Slow disease development is a key feature of lentiviral infections and is the main cause of the underestimated losses in terms of animal production.…”

Section: Introductionmentioning

confidence: 99%

Multi-Platform Detection of Small Ruminant Lentivirus Antibodies and Provirus as Biomarkers of Production Losses

et al. 2020

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Small ruminant lentiviruses (SRLVs) are endemic in most areas of Europe, causing a chronic infection and a multisystemic disease affecting the udder, carpal joints, lungs, and central nervous system. Due to the lack of treatments and protective vaccination strategies, infection control is focused on the identification of infected animals through serological or molecular techniques. However, antigenic and genetic heterogeneity of SRLVs represent a clear drawback for diagnosis. Infected animals may present lower animal production parameters such as birth weight or milk production and quality, depending on productive systems considered and, likely, to the diagnostic method applied. In this study, four sheep flocks dedicated to dairy or meat production were evaluated using three different ELISA and two PCR strategies to classify animal population according to SRLV infection status. Productive parameters were recorded along one whole lactation or reproductive period and compared between positive and negative animals. SRLV was present in 19% of the total population, being unequally distributed in the different flocks. Less than half of the infected animals were detected by a single diagnostic method, highlighting the importance of combining different diagnostic techniques. Statistical analysis employing animal classification using all the diagnostic methods associated lambing size, lamb weight at birth, and daily weight gain with SRLV infection status in meat flocks. Milk production, somatic cell count, fat, and protein content in the milk were associated with SRLV infection in dairy flocks, to a greater extent in the flock showing higher seroprevalence. A multi-platform SRLV diagnostic strategy was useful for ensuring correct animal classification, thus validating downstream studies investigating production traits.

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Investigation on mRNA expression and genetic variation within goat SMAD2 gene and its association with litter size

Wijayanti

Zhang

Bai

et al. 2022

Animal Biotechnology

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Impact of the subclinical small ruminant lentivirus infection of female goats on the litter size and the birth body weight of kids

Cited by 5 publications

References 24 publications

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

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

Multi-Platform Detection of Small Ruminant Lentivirus Antibodies and Provirus as Biomarkers of Production Losses

Investigation on mRNA expression and genetic variation within goat SMAD2 gene and its association with litter size

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