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Table 2 Faecal egg counts (FEC) and plasma pepsinogen (PP) concentrations in positive control and targeted selective treatment (TST) suckler beef heifers in their second grazing season

From: Nematode control in suckler beef cattle over their first two grazing seasons using a targeted selective treatment approach

  

Date and day (d) of study

P-values

Variable

Treatment

15-May-13

5-Jun-13

26-Jun-13

17-Jul-13

7-Aug-13

28-Aug-13

TRT

Time

TRT × Time

(TRT)

d 321

d 342

d 363

d 384

d 405

d 426

FEC (epg)

Control

126a,x (27.0)

54a,x (19.8)

21b,x (25.4)

50a,x (25.3)

13b,x (20.2)

13b,x (13.6)

0.07

< 0.01

0.11

 

TST

170a,x (29.0)

70b,x (21.3)

98a,x (27.3)

83a,x (27.2)

40b,x (21.7)

45b,x (14.6)

   

PP (Utyr)

Control

0.62a,x (0.04)

0.64a,x (0.05)

1.11b,x (0.07)

0.98a,x (0.10)

1.20b,x (0.13)

1.90b,x (0.17)

0.01

< 0.01

0.94

 

TST

0.71a,x (0.04)

0.72a,x (0.05)

1.27b,x (0.07)

0.96a,x (0.10)

1.50b,x (0.14)

2.19b,x (0.18)

   
  1. The values are expressed as Lsmeans (± s.e.m.). a,b,means within row and within measured variable not having a common superscript differ (P < 0.05) from day 321. x,y,means within columns and within measured variable not having a common superscript differ (P < 0.05). Eggs per gram of faeces = epg. International units of tyrosine/litre = Utyr. Control heifers were treated subcutaneously with ivermectin on day 393. Targeted selective treatment heifers were treated with the same product if PP ≥ 2.0 Utyr and FEC was ≥ 200 epg
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Irish Veterinary Journal

ISSN: 2046-0481