Effects of anthelmintics on dairy cow yields

McQueen, I. P. M.; Cottier, K.; Hewitt, Sarah; Wright, D. F.

doi:10.1080/03015521.1977.10425948

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…in DecemberMarch. It may also be significant that McQueen et at (17) found that the effects of anthelmintics on milk yields were most pronounced during the second half of lactation (Dec. Most clinical cases of type II ostertagiasis in this country occur in the winter and spring, but it is suggested that subclinical losses in meat and milk production are more likely to occur in the autumn.…”

Section: Epidemiology and Incidence Related To Locality And Climatementioning

confidence: 86%

Ostertagiasis survey: summary and discussion

Chalmers

1980

New Zealand Veterinary Journal

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Opinions offered by 127 veterinary practitioners indicated that cattle ostertagiasis occurred throughout New Zealand; it was seen in all age-groups regularly in some regions; poorly fed animals were more susceptible to outbreaks accompanied by a gradual decline in health; both poor and well-fed cattle were subject to sudden outbreaks which were almost entirely associated with nutritional changes. Most cases were diagnosed by clinical signs. The prescription of multiple anthelmintic doses was the most common treatment.According to research data, winter and summer conditions reduced O. ostertagi numbers on pasture. Survival depended on a gradual accumulation of inhibited larvae before winter and a reduction after summer. Although clinical type II cases usually occurred in the winter and spring, it was theorised that subclinical production losses were more likely to occur in the autumn.Management was solely responsible for the level of pasture contamination and animal health. Similar O. ()stertagi burdens were recorded in heavy and light cattle, although the latter were more likely to succumb to disease. Changes in worm populations were demonstrated on a farm during a 3-year period. Changes in diagnostic and treatment procedures using plasmapepsinogen estimations and longeracting anthelmintics were discussed.

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Section: Epidemiology and Incidence Related To Locality And Climatementioning

confidence: 86%

Ostertagiasis survey: summary and discussion

Chalmers

1980

New Zealand Veterinary Journal

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“…For seasonal control, environmental contamination must be minimised to prevent continued reinfection 10. The existence of infective larvae in the surroundings of cattle is even more damaging than their development within the cattle 11. Cattle have to give up something in terms of production in order to fight parasitic infections.…”

Section: Introductionmentioning

confidence: 99%

Effect of deworming on milk production in dairy cattle and buffaloes infected with gastrointestinal parasites in the Kavrepalanchowk district of central Nepal

Shrestha

Adhikari

Kafle³

et al. 2020

Veterinary Record Open

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BackgroundIn Nepal, knowledge of proper handling, management and causes of cattle diseases is still limited. The main objective of this study was to explore the impact of deworming on milk production and its effect on milk qualities.MethodsA total of 200 faecal samples (100 buffaloes and 100 cows) were collected and analysed for parasitic burden. Half of the infected cattle (buffaloes, Bos bubalis; cow native, B indicus; European, B taurus) were then dewormed with Levamisole Hydrochloride-Oxyclozanide bolus, and the remaining 50 per cent were left untreated. The milk yield from both infected and dewormed cattle was recorded for 30 days and the qualities of milk were analysed.ResultsThe prevalence of parasitic infection was found to be 22.0 per cent. Fasciola hepatica was the predominant parasite (81.8 per cent), followed by Toxocara vitulorum (34.1 per cent), Strongyloidespapillosus (6.8 per cent) and Bunostomum phlebotomum (4.5 per cent). The average milk yield (litre/day/cow) significantly increased, which was 1.22 litres per day for treated cows and 1.06 litres for treated buffaloes. The intervention effect of deworming among cows was 0.79 (14.06 per cent increment) and for buffaloes was 0.42 (8.32 per cent increment). After deworming the infected cattle, the protein percentage was significantly improved in cows (P=0.035), whereas the lactose percentage and solid percentage had increased significantly in buffaloes (P=0.002 and P=0.028).ConclusionAntiparasitic treatment in cattle had positive effects on milk qualities such as solid non-fat, lactose, solid percentage and total protein percentage.

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“…However, in this previous study, cows were treated with eprinomectin, a persistent-activity product which prevents from re-infection with Ostertagia for 28 days [ 52 ]; and MP was followed for only 4 weeks after treatment, a period over which cows could therefore not be re-infected. The same was true in studies where several treatments were applied repeatedly on lactating cows during the grazing season [ 23 , 39 , 40 ]: positive effects of these repeated treatment strategies on MP were mainly reported but with highly limited post-treatment reinfections during the period of follow-up. On the contrary, in our study, treated cows could be re-infected during the 105 days period of follow up after the non-persistent fenbendazole treatment, because they kept grazing together with control cows on pastures where parasitic cycles had been re-initiated for 1.5 to 2 months.…”

Section: Discussionmentioning

confidence: 72%

“…Only one study reported a positive effect of a single treatment applied 1.5 months after turn out [ 38 ], but this study was conducted with a small sample size (40 cows in one herd). In a few other studies, several treatments were applied repeatedly on lactating cows during the grazing season, with a positive or a non-significant effect on MP [ 23 , 39 , 40 ]. But this whole herd repeated-treatment strategy is of course questionable if we keep in mind the need to preserve a large population of parasites in refugia .…”

Section: Introductionmentioning

confidence: 99%

Unexpected Decrease in Milk Production after Fenbendazole Treatment of Dairy Cows during Early Grazing Season

et al. 2016

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Gastrointestinal nematodes (GIN) infection can impair milk production (MP) in dairy cows. To investigate whether MP would be optimized by spring targeted-selective anthelmintic treatment in grazing cows, we assessed (1) the effect on MP of an anthelmintic treatment applied 1.5 to 2 months after turn-out, and (2) herd and individual indicators associated with the post-treatment MP response. A randomized controlled clinical trial was conducted in 13 dairy farms (578 cows) in western France in spring 2012. In each herd, lactating cows of the treatment group received fenbendazole orally, control cows remained untreated. Daily cow MP was recorded from 2 weeks before until 15 weeks after treatment. Individual serum pepsinogen and anti-Ostertagia antibody levels (expressed as ODR), faecal egg count and bulk tank milk (BTM) Ostertagia ODR were measured at treatment time. Anthelmintic treatment applied during the previous housing period was recorded for each cow. In each herd, information regarding heifers’ grazing and anthelmintic treatment history was collected to assess the Time of Effective Contact (TEC, in months) with GIN infective larvae before the first calving. The effect of treatment on weekly MP averages and its relationships with herd and individual indicators were studied using linear mixed models with two nested random effects (cow within herd). Unexpectedly, spring treatment had a significant detrimental effect on MP (-0.92 kg/cow/day on average). This negative MP response was particularly marked in high producing cows, in cows not treated during the previous housing period or with high pepsinogen levels, and in cows from herds with a high TEC or a high BTM ODR. This post-treatment decrease in MP may be associated with immuno-inflammatory mechanisms. Until further studies can assess whether this unexpected result can be generalized, non-persistent treatment of immunized adult dairy cows against GIN should not be recommended in early grazing season.

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Effects of anthelmintics on dairy cow yields

Cited by 9 publications

References 11 publications

Ostertagiasis survey: summary and discussion

Ostertagiasis survey: summary and discussion

Effect of deworming on milk production in dairy cattle and buffaloes infected with gastrointestinal parasites in the Kavrepalanchowk district of central Nepal

Unexpected Decrease in Milk Production after Fenbendazole Treatment of Dairy Cows during Early Grazing Season

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