Type

Journal Article

Authors

Theo de Waal
Damien Barrett
Paul Crosson
Michael L Doherty
John F. Mee
Bernadette Earley
James O'Shaughnessy

Subjects

Veterinary

Topics
weight gain live weight plasma concentrations respiratory disease anthelmintic resistance beef cattle beef calves treatment

Nematode control in suckler beef cattle over their first two grazing seasons using a targeted selective treatment approach. (2014)

Abstract With concerns over the development of anthelmintic resistance in cattle nematode populations, we must re-examine our approach to nematode control in cattle. Targeted selective treatments (TST), whereby individual animals are treated instead of entire groups, are being investigated as an alternative. The study objective was to determine if anthelmintic usage could be reduced using a TST-based approach to nematode control in spring-born suckler beef cattle over their first and second grazing seasons (SGS) without affecting performance. In the first grazing season (FGS), 99 calves with an initial mean (s.d.) calf age and live weight on day 0 (June 28(th) 2012) of 107 (23.1) days and 160 (32.5) kg, respectively, were used. The study commenced on day 0 when calves were randomised and allocated to one of two treatments; 1), standard treatment (control) and 2), TST. Control calves were treated subcutaneously with ivermectin on days 0, 41 and 82 in the FGS. All calves were treated with ivermectin on day 124 and housed on day 133. In the SGS, only heifer calves from the FGS were used and control heifers were treated with ivermectin on day 393. Animals were weighed, blood and faecal sampled every three weeks. The TST animals were treated with ivermectin if thresholds based on a combination of plasma pepsinogen concentrations, faecal egg count and/or the presence of Dictyocaulus viviparus larvae in faeces (FGS only) were reached. No TST calves reached the treatment threshold criteria in the FGS. The FGS average daily live weight gain (ADG ± s.e.m.) for control and TST group calves was 0.89 ± 0.02 kg and 0.94 ± 0.02 kg day(-1), respectively (P = 0.17). In the SGS, all heifers were treated with ivermectin on day 431 due to clinical signs of respiratory disease. The ADG for control and TST heifers from turnout on day 321 to day 431 was 0.90 ± 0.04 and 0.80 ± 0.04 kg day(-1), respectively (P = 0.03). Spring-born FGS suckler beef calves require minimal anthelmintic treatment to maintain performance. In contrast, clinical parasitic disease may develop in the SGS unless appropriate anthelmintic treatment is provided.
Collections Ireland -> Teagasc -> PubMed

Full list of authors on original publication

Theo de Waal, Damien Barrett, Paul Crosson, Michael L Doherty, John F. Mee, Bernadette Earley, James O'Shaughnessy

Experts in our system

1
Theo de Waal
Teagasc
Total Publications: 41
 
2
Damien J. Barrett
Teagasc
Total Publications: 23
 
3
Paul Crosson
Teagasc
Total Publications: 16
 
4
Michael L. Doherty
Teagasc
Total Publications: 119
 
5
J F Mee
Teagasc
Total Publications: 72
 
6
Bernadette Earley
Teagasc
Total Publications: 120
 
7
James O'Shaughnessy
Teagasc
Total Publications: 9