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RESEARCH ARTICLE

Effect of different levels of physically effective neutral detergent fibre from forage in whole corn grain-based diets for feedlot lambs

Matheus Sousa de Paula Carlis https://orcid.org/0000-0003-2641-5987 A , Janaina Socolovski Biava https://orcid.org/0000-0001-8192-4907 A , Thamires Ubices Sturion A , Adrielly Lais Alves da Silva A , Nathalia Rubio Eckermann A , Daniel Montanher Polizel https://orcid.org/0000-0003-4160-2596 A B , Paulo César Gonzales Dias Junior https://orcid.org/0000-0003-2595-3708 A , Ana Carolina Silva Vicente https://orcid.org/0000-0003-3185-6656 A , Jamile Haddad Comelli https://orcid.org/0000-0001-9417-9360 A , Rodrigo Silva Goulart https://orcid.org/0000-0002-4961-3866 C , Alejandro E. Relling https://orcid.org/0000-0002-1288-3037 D , Alexandre Vaz Pires https://orcid.org/0000-0002-2210-7963 A B and Evandro Maia Ferreira https://orcid.org/0000-0002-1057-5508 A *
+ Author Affiliations
- Author Affiliations

A Department of Animal Science, ‘Luiz de Queiroz’ College of Agriculture, University of São Paulo, Pádua Dias Avenue, n 11, PO Box 09, Piracicaba, São Paulo 13418-900, Brazil.

B Department of Nutrition and Animal Production, FMVZ, University of São Paulo, Duque de Caxias North Avenue, n 225, Pirassununga, São Paulo 13635-000, Brazil.

C Department of Animal Science, College of Animal Science and Food Engineering, University of São Paulo, Pirassununga, São Paulo 13635-900, Brazil.

D Department of Animal Sciences, The Ohio State University, Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691-4096, USA.

* Correspondence to: evandro.ferreira@usp.br

Handling Editor: Edward Clayton

Animal Production Science 63(17) 1759-1771 https://doi.org/10.1071/AN22394
Submitted: 24 October 2022  Accepted: 24 August 2023  Published: 11 September 2023

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

Abstract

Context

The minimum requirements of physically effective neutral detergent fibre of forage (peNDF-F) in finishing diets for feedlot lambs has not been consolidated.

Aims

The present study evaluated the effect of increasing levels of peNDF-F on growth performance, blood metabolites, carcass characteristics, and ingestive behaviour of feedlot lambs fed a whole corn grain-based diet.

Methods

Forty-five Dorper × Santa Inês rams, with an initial bodyweight (BW) of 22.6 ± 5.3 kg (mean ± s.d.) and 88 ± 10 days old (mean ± s.d.), were used. The experimental design was a randomised complete block (five treatments and nine blocks), defined by the initial BW and age at the beginning of the experiment. The experimental diets were formulated to be isonitrogenous and isoenergetic. The experimental diets were as follows: ground corn-based diet with 72 g/kg of peNDF-F from coastcross (Cynodon sp.) hay (CONT, positive control); whole corn grain-based diet without coastcross (Cynodon sp.) hay (0peNDF-F); whole corn grain-based diet with 36 g/kg of peNDF-F from coastcross (Cynodon sp.) hay (36peNDF-F); whole corn grain-based diet with 72 g/kg of peNDF-F from coastcross (Cynodon sp.) hay (72peNDF-F); whole corn grain-based diet with 108 g/kg of peNDF-F from coastcross (Cynodon sp.) hay (108peNDF-F) (DM basis).

Key results

The increasing concentrations of peNDF-F in whole corn-based diets reduced the dry-matter intake (P < 0.0001), average daily gain, feed efficiency, final BW, carcass characteristics (P < 0.05), AST (P = 0.01), and glucose concentration (P ≤ 0.03). Additionally, the increasing concentrations of peNDF-F decreased the area (P ≤ 0.02) and the length of ruminal papillae (P = 0.008). The rumination and chewing times (min/day) showed a quadratic response; a longer rumination time (P = 0.001) was observed with 72peNDF-F and the longer chewing time (P = 0.006) with 108peNDF-F.

Conclusions

Whole corn grain-based diets can be used without the addition of peNDF-F for lambs.

Implications

Thus, utilisation of whole corn grain diet can be a strategy to successfully feed and fatten lambs to slaughter.

Keywords: carcass, feedlots, fibre, intake behaviour, lambs, maize grain, rumen function, ruminal pH.

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