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RESEARCH ARTICLE

Haemato-biochemical responses, worm burdens and Haemonchus contortus ultrastructural changes in lambs fed diets containing graded inclusion levels of sericea lespedeza

Leo Nyikadzino Mahachi A , Obert Chenjerayi Chikwanha A , Chenaimoyo Lufutuko Faith Katiyatiya A , Munyaradzi Christopher Marufu B , Adeyemi Oladapo Aremu C and Cletos Mapiye https://orcid.org/0000-0002-1474-8648 A *
+ Author Affiliations
- Author Affiliations

A Department of Animal Sciences, Faculty of AgriSciences, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa.

B Department of Veterinary Tropical Diseases, Faculty of Veterinary Sciences, University of Pretoria, Private Bag X4, Onderstepoort 0110, South Africa.

C Indigenous Knowledge Systems Centre, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2745, South Africa.

* Correspondence to: cmapiye@sun.ac.za

Handling Editor: Andy Greer

Animal Production Science 63(14) 1394-1409 https://doi.org/10.1071/AN23087
Submitted: 1 March 2023  Accepted: 22 June 2023   Published: 20 July 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context: Globally, sheep productivity is constrained by scarcity of high-quality feed and haemonchosis. These challenges may simultaneously be addressed by valorisation of nutraceutical forage legumes such as sericea lespedeza (SL) into sheep diets.

Aim: The current study determined the effects of feeding diets containing increasing inclusion levels of SL (0%, 6.25%, 12.5%, 18.75% and 25%) as replacement for lucerne on haematological, biochemical, and parasitological parameters in Haemonchus contortus-infected and non-infected lambs.

Methods: Bodyweights, body condition scores (BCS), FAMACHA© scores, faecal worm egg counts (FWEC), and haematological and biochemical parameters were recorded from 80 Dohne Merino intact male lambs assigned to diet-by-infection status-based treatments in a completely randomised design, with a 5 × 2 factorial arrangement of treatments comprising of eight lambs per treatment during a 42-day feeding trial. Adult worms were collected, enumerated, and their ultra-structure was evaluated using scanning electron microscopy after slaughter.

Results: Diet, and diet × infection status had no effects on red blood-cell parameters of the lambs (P > 0.05). Eosinophils were affected by diet × infection status, being highest in non-infected lambs fed the control diet and lowest in infected lambs fed the 25% SL diet (P ≤ 0.05). Serum albumin, calcium and body condition scores declined (P ≤ 0.05) with increasing inclusion levels of SL in the diet. There was no influence of diet on lamb bodyweights, FAMACHA© scores, FWEC, and worm burdens. Dietary increments of SL disrupted the structural integrity of the head (χ2 = 28.43; ϕc = 0.493; P ≤ 0.05) of adult worms.

Conclusions: Sericea lespedeza may replace lucerne up to 25% in lamb feedlot diets, with minor negative effects on haematological and biochemical parameters, but offers little benefits for modulating Haemonchus contortus infection.

Implications: Beneficiation of biologically active alternative feed resources such as sericea lespedeza could help farmers adapt better to market changes through the development of enhanced livestock feed and pharmaceutical products, which could help alleviate losses associated with impoverished nutrition and gastrointestinal health of lambs.

Keywords: anthelminthics, blood metabolites, condensed tannins, faecal worm egg counts, fodder crops, haemonchosis, nutraceuticals, ruminant nutrition, worm structural integrity.


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