A comparison of early and mid grazing season suppressive anthelmintic treatments for first year grazing calves and their effects on natural and experimental infection during the second year

Taylor, Subhashni; Mallon, TR; Kenny, J.; Edgar, H.W.J.

doi:10.1016/0304-4017(94)00660-5

Cited by 17 publications

(12 citation statements)

References 30 publications

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“…Predicted FEC in the untreated groups were similar to observed FEC . Observed FEC increased as time progressed, and in studies conducted for a sufficient time period (>150 days) FEC reached a peak and began to decline (Jacobs et al 1989 ; Taylor et al 1995 ; Satrija et al 1996 ) although rebounded later. Model predictions were consistently similar to observations made for the ivermectin treated groups ( Fig.…”

Section: Resultsmentioning

confidence: 99%

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A stochastic model to investigate the effects of control strategies on calves exposed toOstertagia ostertagi

et al. 2016

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SUMMARYPredicting the effectiveness of parasite control strategies requires accounting for the responses of individual hosts and the epidemiology of parasite supra- and infra-populations. The first objective was to develop a stochastic model that predicted the parasitological interactions within a group of first season grazing calves challenged by Ostertagia ostertagi, by considering phenotypic variation amongst the calves and variation in parasite infra-population. Model behaviour was assessed using variations in parasite supra-population and calf stocking rate. The model showed the initial pasture infection level to have little impact on parasitological output traits, such as worm burdens and FEC, or overall performance of calves, whereas increasing stocking rate had a disproportionately large effect on both parasitological and performance traits. Model predictions were compared with published data taken from experiments on common control strategies, such as reducing stocking rates, the ‘dose and move’ strategy and strategic treatment with anthelmintic at specific times. Model predictions showed in most cases reasonable agreement with observations, supporting model robustness. The stochastic model developed is flexible, with the potential to predict the consequences of other nematode control strategies, such as targeted selective treatments on groups of grazing calves.

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Section: Resultsmentioning

confidence: 99%

“…8 A–E, both observed and predicted patterns showed initially an increase in PC as time progressed. Congruent with FEC, PC also reached a peak and began to decline (Taylor et al 1995 ). However, this was not supported by Satrija et al ( 1996 ), where predictions diverged from observed PC from day 100.…”

Section: Resultsmentioning

confidence: 99%

A stochastic model to investigate the effects of control strategies on calves exposed toOstertagia ostertagi

et al. 2016

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“…This issue has been addressed in a number of studies and the consensus is that animals treated in their first grazing season may display some reduced immune protection when subsequently artificially challenged with high infective doses of larvae. However, under normal husbandry conditions, second grazing season cattle (and adult cows) are exposed to only low levels of over-wintered larvae following turn-out in the Spring and consequently no significant negative effects on the occurrence of clinical disease or growth performance have been observed (Armour, 1989;Claerebout et al, 1998;Larsson et al, 2011;Schnieder et al, 1996;Taylor et al, 1995a;Vercruysse et al, 1995).…”

Section: Young Cattlementioning

confidence: 98%

LongRange™ (eprinomectin 5%) extended-release injection parasiticide and the utility of extended-activity antiparasitics in cattle

Forbes¹

2013

Veterinary Parasitology

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An extended-release injection, which is administered at a rate of 1 mg eprinomectin/kg body weight, has been developed to provide up to 150 days control of parasites of cattle. The product can facilitate the achievement of two of the fundamental aims of parasite control. The first is protection of the host against the negative impact of susceptible parasites in order to ensure control of disease and to enhance performance. The second is to reduce parasite transmission and hence the challenge to animals when grazing. In addition, farmers and veterinarians can benefit from high levels of convenience and hence compliance from a single administration, which also limits handling stress in the cattle. This introductory paper provides some perspective on the practical applications for this extended-release product under various husbandry systems and in different classes of cattle and discusses its role in sustainable parasite control.

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“…Anthelmintics are central to the control of these infections (van Wyk et al, 2006) and as a result many chemoprophylactic programmes have been designed for FGS dairy calves (Claerebout et al, 1999;Taylor et al, 1995;Vercruysse et al, 1995). Although chemoprophylaxis may not always be warranted in FGS dairy calves for the treatment of gastrointestinal nematode (GIN) infections (Shaw et al, 1997), it will however help to mitigate the effects of challenge due to lungworm, which is important as it is difficult to predict when a disease outbreak due to lungworm challenge may occur.…”

Section: Introductionmentioning

confidence: 99%

Controlling nematodes in dairy calves using targeted selective treatments

O'Shaughnessy

Earley

Mee

et al. 2015

Veterinary Parasitology

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A comparison of early and mid grazing season suppressive anthelmintic treatments for first year grazing calves and their effects on natural and experimental infection during the second year

Cited by 17 publications

References 30 publications

A stochastic model to investigate the effects of control strategies on calves exposed toOstertagia ostertagi

A stochastic model to investigate the effects of control strategies on calves exposed toOstertagia ostertagi

LongRange™ (eprinomectin 5%) extended-release injection parasiticide and the utility of extended-activity antiparasitics in cattle

Controlling nematodes in dairy calves using targeted selective treatments

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