Comparison of lipid profiles in the faeces of beef cattle fed three common temperate grass silage diets and their relevance to dietary composition

A - Papers appearing in refereed journals

Elayadeth-Meethal, M., Rivero, M. J., Mead, A., Lee, M. R. F. and Misselbrook, T. H. 2023. Comparison of lipid profiles in the faeces of beef cattle fed three common temperate grass silage diets and their relevance to dietary composition. Journal Of Animal And Feed Sciences. 32 (4), pp. 427-437. https://doi.org/10.22358/jafs/166079/2023

AuthorsElayadeth-Meethal, M., Rivero, M. J., Mead, A., Lee, M. R. F. and Misselbrook, T. H.
Abstract

Faecal lipidome signatures may vary depending on diet. Analyzing 17 different lipidome com-pounds and calculating ratios between them, we analysed the composition of faecal lipidomes (fatty alcohols, stanols, and archaeol) of beef cattle fed different diets. In this study, we measured the faecal lipidome profiles of beef cattle fed three types of grass silage representative of UK grasslands by gas chromatography-mass spectrometry. The forage consisted of 1) permanent pasture (sown perennial ryegrass mixed with unsown species; PP); 2) reseeded perennial ryegrass monoculture (PRG); and 3) reseeded mixture of perennial ryegrass and white clover (ca 80:20 fresh weight; PRG-WC). The contents of three forages varied significantly in WSC (water-soluble carbohydrates), ADF (acid detergent fibre), NDF (neutral detergent fibre), MADF (modified acid detergent fibre), CP (crude protein), ME (metabolizable energy), and crude ash. Diet significantly affected the composition of the faecal lipidome. Apart from stigmasterol, sex and the diet-by-sex interaction did not affect the faecal lipidome. Further, the ratios of lipidome compounds in faeces were validated as biomarkers of diet composition. The 24-ethyl coprostanol, 5-stigmastanol, campesterol, and even chain fatty alcohols such as 3-hydroxy stearoyl carnitine (C18-OH), C22-OH, C24-OH, C26-OH, and various lipidome ratios differed significantly between diets on a univariate basis. Based on an analysis of the composition and ratios of faecal lipidomes, this study provides a means for predicting the diet composition of agricultural livestock and wild herbivores.

KeywordsGrassland; Grazing livestock systems; Forage quality; Nutritional value; Sustainability; Faecal lipidome; Biomarkers; Diet composition
Year of Publication2023
JournalJournal Of Animal And Feed Sciences
Journal citation32 (4), pp. 427-437
Digital Object Identifier (DOI)https://doi.org/10.22358/jafs/166079/2023
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeS2N - Soil to Nutrition - Work package 2 (WP2) - Adaptive management systems for improved efficiency and nutritional quality
The North Wyke Farm Platform- National Capability [2017-22]
Publisher's version
Accepted author manuscript
Output statusPublished
Publication dates
Online25 Jul 2023
Publication process dates
Accepted11 May 2023
PublisherKielanowski Inst Animal Physiology Nutrition
ISSN1230-1388

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