# Broiler Responses to Dietary Fibre Sources at Different Ages: Effects on Growth Performance, Nutrient Digestibility, Blood Parameters and Intestinal Morphology

## TL;DR

This study shows that feeding broiler chickens different types of dietary fiber at different ages can improve their growth and digestion.

## Contribution

The study reveals how the age of broilers affects the benefits of specific fiber sources on growth and digestion.

## Key findings

- Inclusion of rice hulls during the grower period and sugar beet pulp during the finisher period improved feed conversion ratio and body weight gain.
- Combined fiber sources enhanced nutrient digestibility and increased the villus height–to–crypt depth ratio in broilers.
- The greatest dry matter, organic matter, and neutral detergent fiber digestibility were observed in the group receiving a combination of rice hulls and sugar beet pulp.

## Abstract

Previous studies investigated the effect of different levels of fibre sources, but little research is available on the effect of a bird's age on the type of fibre source.

The study aimed to determine the effect of rice hulls (RHs) and sugar beet pulp (SBP) on growth performance, nutrient digestibility, blood parameters and intestinal morphology of broilers at different ages.

A total of 160 newly hatched Ross 308 male broiler chicks were randomly assigned to 4 dietary groups, each with 4 replicates and 10 chicks per replicate. Dietary treatments included: T1: control diet without any additions at grower and finisher periods; T2: diet containing 3% RH in the grower period and 3% SBP in the finisher period; T3: diet containing 3% SBP in the grower period and 3% RH in the finisher period; and T4: diet containing 1.5% RH and 1.5% SBP in the grower and finisher periods. Average growth performance during this period and nutrient digestibility, blood parameters and ilium morphology were evaluated at Days 24 and 42.

Feed conversion ratio (FCR) of broilers significantly improved in the T2 group from 11 to 24 days and body weight gain (BWG) in T2 and T4 from 11 to 42 days of age (p < 0.05). At 42 days of age, the greatest dry matter (DM), organic matter (OM) and neutral detergent fibre (NDF) digestibility were observed in the T4 group in comparison to the T3 groups (p < 0.05). The ilium villus height–to–crypt depth (VH/CD) ratio increased at 24 days of age in the T1 and T2 groups (p < 0.05).

Our study showed that the T2 and T4 groups might enhance broiler growth performance through increasing nutrient digestibility and ilium morphology during Days 11 to 42 days of age.

Inclusion of rice hulls during the grower period and sugar beet pulp during the finisher period improved FCR and BWG in broiler chickens. Combined fibre sources enhanced nutrient digestibility and increased villus height–to–crypt depth ratio.