Post‐weaning growth of beef heifers drenched with long‐ or short‐acting anthelmintics

Publisher： John Wiley & Sons Inc

E-ISSN： 1751-0813|94|9|341-346

ISSN： 0005-0423

Source： AUSTRALIAN VETERINARY JOURNAL, Vol.94, Iss.9, 2016-09, pp. : 341-346

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Objective

To determine whether (i) the drenching practices of beef producers in the Central Tablelands of NSW utilising short‐acting anthelmintics limit the post‐weaning growth of heifers and (ii) a single weaning treatment of a long‐acting anthelmintic improves post‐weaning growth.

Methods

Commencing at weaning, 20/100 heifers in each of five herds were injected four times at 90‐day intervals with long‐acting moxidectin to suppress gastrointestinal nematodes. In year 1 the balance was drenched using the owner's usual commercial practice with short‐acting anthelmintics (5 herds) or left undrenched (1 herd). In year 2 the balance was drenched with long‐acting moxidectin within 3 months of weaning (4 herds) or with short‐acting drenches only (2 herds). At each visit live weight (LW) was recorded and a subsample tested for worm egg count (WEC) and plasma pepsinogen.

Results

In year 1 by 3 and 6 months’ post weaning, suppressed heifers were significantly heavier than the undrenched and short‐acting groups, and by 12 months were 40 and 28 kg heavier, respectively. In year 2, the LW of the suppressed and long‐acting heifers was not different, but by 3 and 6 months both groups were significantly heavier than the short‐acting group and by 12 months were 22 kg heavier.

Conclusion

The post‐weaning growth of beef heifers treated with short‐acting drenches as adopted by Tablelands beef producers was slower than heifers drenched suppressively or with a single long‐acting drench at weaning.

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