Associations between nematode larval challenge and gastrointestinal tract size that affect carcass productivity in sheep

Jacobson, Caroline; Pluske, J.R.; Besier, R.B.; Bell, K.; Pethick, D.W.

doi:10.1016/j.vetpar.2009.01.008

Cited by 16 publications

(11 citation statements)

References 23 publications

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“…Similarly, the cold carcass weight was 4.1% and 13.7% higher in controls in comparison with infected lambs, respectively, in the supplemented and basal diets. These results are substantiated by findings of several studies involving sheep that reported significant reductions in weight gain and carcass weight due to GIN infections (JACOBSON et al, 2009;SUTHERLAND et al, 2010;MILLER et al, 2012;MAVROT et al, 2015).…”

Section: Discussionsupporting

confidence: 60%

Losses caused by gastrointestinal nematode infections in Dorper lambs under two nutritional status

Starling

Almeida

Viana

et al. 2019

Rev. Bras. Parasitol. Vet.

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The aim of this study was to evaluate the effect of two nutritional statuses on the productive performance of Dorper lambs naturally infected with gastrointestinal nematodes. Thirty-two lambs, grazing together on the same pasture, were allocated into four experimental groups: (G1) infected-supplemented diet, (G2) control-supplemented diet, (G3) infected-basal diet, and (G4) control-basal diet. Control animals received suppressive treatment with monepantel every two weeks, while precautionary anthelmintic treatments were given to all lambs of the infected groups with packed cell volume (PCV) <23%. There was reduction in the PCV means of all groups, which was more pronounced in the infected lambs that also presented reduction in total plasma protein values in comparison with the controls. Weight gain was affected by diet and infection status (P < 0.05). Daily body weight gain was 0.170 kg in the G1, 0.205 kg in the G2, 0.085 kg in the G3, and 0.116 kg in the G4. The cold carcass weight was 4.1% and 13.7% higher in controls in comparison with infected lambs, respectively, in the supplemented and basal diets. The infected groups, despite receiving precautionary anthelmintic treatments to prevent deaths due to haemonchosis, presented reduction in the production parameters in comparison with the controls.

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Section: Discussionsupporting

confidence: 60%

Losses caused by gastrointestinal nematode infections in Dorper lambs under two nutritional status

Starling

Almeida

Viana

et al. 2019

Rev. Bras. Parasitol. Vet.

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“…Although not significant, HSCW was 0.3kg lighter in lambs shedding Cryptosporidium pre-slaughter, whilst their visceral tissue (live weight -HSCW) was 0.8kg heavier, implying that impact on visceral (non-carcase) tissue weight was the key driver of the reduced dressing % response observed for these lambs. This observation was consistent with previous studies showing dressing % (but not necessarily live weight) was reduced in sheep infected with nematodes (Liu et al, 2005;Jacobson et al, 2009) and protozoan parasites (Sweeny 2012;Sweeny et al, 2012b), and supports the suggestion that live weight may underestimate carcase productivity losses in sheep associated with parasitism.…”

Section: Parvum (But Not All Cryptosporidium Spp)supporting

confidence: 92%

Greater intensity and frequency of Cryptosporidium and Giardia oocyst shedding beyond the neonatal period is associated with reductions in growth, carcase weight and dressing efficiency in sheep

Jacobson

Williams

Yang

et al. 2016

Veterinary Parasitology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Haemonchus status (positive or negative) with lamb production were assessed using general linear models (HSCW and dressing %) and linear mixed effects models (live weight). HighCryptosporidium parvum shedding was associated with lower live weight, ranging 2.31-4.52kg over the 3 sampling occasions. Cryptosporidium parvum shedding was associated 3 with less HSCW in high (3.22kg less) and low (3.22kg less) shedding lambs post-weaning, and high (2.21kg less) and low (2.60kg less) shedding lambs pre-slaughter as well as lower dressing % (2.7% lower in high shedding lambs post-weaning). Cryptosporidium (all species) shedding pre-slaughter was associated with reduced dressing % in both high (1.25% lower) and low (1.21% lower) shedding lambs. Giardia shedding pre-slaughter was associated with 0.59kg less HSCW in high shedding lambs. Increased frequency of C.parvum and Giardia shedding in a specific animal (repeated detection) were associated with Abbreviations:HSCW: hot standard carcase weight WEC: Faecal worm egg count

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“…Consequently BCS is potentially a more accurate and reliable indicator on the consequences of internal parasitism on productivity compared to live weight. Carcase weight was not measured in this present study, but previous studies suggest that impacts of parasitism on carcase weight may be greater than is indicated by live weight differences between infected and uninfected lambs (Jacobson et al, 2009;Sweeny et al, 2011b).…”

Section: Discussionmentioning

confidence: 75%

Impacts of naturally acquired protozoa and strongylid nematode infections on growth and faecal attributes in lambs

Sweeny

Robertson

Ryan

et al. 2012

Veterinary Parasitology

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Please cite this article as: Sweeny, J.P.A., Robertson, I.D., Ryan, U.M., Jacobson, C., Woodgate, R.G., Impacts of naturally acquired protozoa and strongylid nematode infections on growth and faecal attributes in lambs, Veterinary Parasitology (2010Parasitology ( ), doi:10.1016Parasitology ( /j.vetpar.2011 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Page 1 of 39 A c c e p t e d M a n u s c r i p t with an increased risk of non-pelleted faeces (FCS≥3.0) for both flocks. Cryptosporidium-27 positive lambs were 2.8-11.6 times more likely to have non-pelleted faeces and Giardia 28 positive lambs were 2.4-14.0 times more likely to have non-pelleted faeces compared to 29 lambs negative for each respective parasite. Lambs positive for both Cryptosporidium and 30 Giardia were 2.9-11.8 times more likely to have non-pelleted faeces than lambs positive 31 for only one or neither of these parasites. Mixed internal parasite infections were found to 32 have greater impacts on FCS and BCS than single infections. A higher number of internal 33 parasites detected per lamb was associated with lower BCS and more loose faeces. The 34 relationship between parasite detection and live weight or growth rate were inconsistent for 35 both flocks. Adjusted WEC was correlated with FCS and faecal DM% for one flock only, 36 although little or no correlation was found with live weight and growth rate for both flocks. 37Cryptosporidium ubiquitum and C. parvum were the most prevalent Cryptosporidium 38Page 3 of 39 A c c e p t e d M a n u s c r i p t Page 3 of 3 species isolated in the two flocks. Giardia assemblage E was the most commonly isolated 39 genotype assemblage from both flocks, while assemblage A was isolated almost as 40 frequently as assemblage E in the one flock. One flock was a potential source of zoonotic 41Cryptosporidium and the other flock was a potential source of zoonotic Giardia. 42

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Associations between nematode larval challenge and gastrointestinal tract size that affect carcass productivity in sheep

Cited by 16 publications

References 23 publications

Losses caused by gastrointestinal nematode infections in Dorper lambs under two nutritional status

Losses caused by gastrointestinal nematode infections in Dorper lambs under two nutritional status

Greater intensity and frequency of Cryptosporidium and Giardia oocyst shedding beyond the neonatal period is associated with reductions in growth, carcase weight and dressing efficiency in sheep

Impacts of naturally acquired protozoa and strongylid nematode infections on growth and faecal attributes in lambs

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