ß-Hydroxy-ß-methylbutyrate: A Feed Supplement Influencing Performance, Bone Metabolism, Intestinal Morphology, and Muscle Quality of Laying Hens: a Preliminary One-point Study

Overview

Journal Poult Sci

Publisher Elsevier

Specialty Veterinary Medicine

Date 2024 Mar 12

PMID 38471225

Authors

Ewa Tomaszewska

Sylwester Swiatkiewicz

Anna Arczewska-Wlosek

Dorota Wojtysiak

Piotr Dobrowolski

Piotr Domaradzki

Iwona Puzio

Halyna Rudyk

Oksana Brezvyn

Siemowit Muszynski

Affiliations

Soon will be listed here.

Abstract

Laying hens, selectively bred for high egg production, often suffer from bone fragility and fractures, impacting their welfare and causing economic losses. Additionally, gut health and muscle quality are crucial for overall health and productivity. This study aimed to evaluate the effects of ß-Hydroxy-ß-methylbutyrate (HMB) supplementation on performance, bone metabolism, intestinal morphology, and muscle quality in laying hens. Forty-eight Bovans Brown hens were divided into a control group and an HMB-supplemented group (0.02% HMB in diet). The study spanned from the 31st to the 60th wk of age. Assessments included bone mechanical testing, serum hormonal analysis, histological analysis of bone and intestine, and muscle quality analysis. The HMB supplementation led to decreased feed intake without affecting body weight or laying rate in laying hens. It caused an increase in both mean daily and total egg weight, indicating improved feed utilization, without influencing the feed intake to egg weight ratio. Enhanced bone formation markers and altered intestinal morphometric parameters were observed, along with improved trabecular bone structure. However, no changes in measured other bone quality indices, including geometric, densitometric, or mechanical properties were observed. Muscle analysis revealed no significant changes in overall meat quality, except for a decrease in cholesterol content and alterations in the fatty acid profile, notably a reduction in total n-3 polyunsaturated and total polyunsaturated fatty acids (PUFA). In conclusion, although not all effects of HMB supplementation were unequivocally beneficial, the positive changes in performance data and trabecular bone microarchitecture support further research into various doses and durations of supplementation. Such studies are necessary to fully understand and optimize the benefits of HMB for enhancing the health and productivity of laying hens.

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