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Assessing Digestibility Coefficient of Non-Forage Fiber Source With and Without Fibro-lytic Enzymes in Goat Total Mixed Ration

January 1, 2026
Muhmamad Arslan

Published: December 2025
Publisher: Industrial Experts Forums Pakistan

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Authors:
Ahtesham Khalid and Muhammad Mahboob Ali Hamid
Institute of Animal and Dairy Sciences,
University of Agriculture, Faisalabad, Pakistan

Abstract

Goat is an essential part of Pakistan livestock sector, contributing to food security and rural livelihoods through their adaptability and efficient use of fibrous feeds. Despite these strengths, productivity is often constrained by the poor digestibility of traditional high-fiber diets. Incorporating non-forage fiber sources (NFFS), such as soybean hulls, into feeding systems offers a sustainable approach to improve nutrient utilization, reduce reliance on grains, and minimize risks like ruminal acidosis.

Soybean hulls provide highly digestible fiber, while fibro-lytic enzyme supplementation further enhances fiber breakdown, nutrient absorption, and animal performance. Together, these strategies improve feed intake, growth, feed efficiency, body condition, and digestive health. Adoption of NFFS with enzyme supplementation holds significant promise for boosting goat productivity, reducing feed costs, and supporting sustainable livestock production in Pakistan.

1. Introduction

The livestock sector in Pakistan contributes about 63.6% to the agricultural GDP and nearly 15% to the total GDP, making it a cornerstone of rural livelihoods and food security. Goat are particularly significant due to their adaptability, short generation interval, and ability to thrive on low-quality fibrous feed resources. Despite these advantages, productivity in goat remains constrained by poor feed efficiency and limited digestibility of fibrous diets.

Globally, increasing demand for goat meat and milk has pushed production toward more intensive feeding systems, which, if not managed carefully, may lead to digestive problems such as ruminal acidosis. In this context, the integration of non-forage fiber sources (NFFS) such as soybean hulls, combined with fibro-lytic enzyme supplementation, is emerging as a promising strategy to enhance fiber utilization, improve nutrient absorption, and sustain animal performance.

2. Non-Forage Fiber Sources in Goat Nutrition

NFFS are agro-industrial by-products rich in digestible fiber and low in lignin, making them more fermentable than traditional forages. Soybean hulls, beet pulp, and citrus pulp are commonly used NFFS that enhance palatability, reduce bulkiness, and improve feed intake. Among these, soybean hulls are particularly valued for their high hemicellulose content and rapid fermentability, which support rumen microbial activity and energy supply.

In Pakistan, where forage availability fluctuates seasonally, soybean hulls can be incorporated into total mixed rations (TMR) to provide a stable fiber source. Their sweet flavor and digestibility make them highly acceptable to goat, reducing sorting behavior and encouraging consistent nutrient intake. By partially replacing forages or concentrates, soybean hulls also help mitigate the risks associated with high-grain diets, such as acidosis and reduced fiber digestibility.

3. Importance of Non-Forage Fiber Sources in Goat Nutrition

Non-forage fiber sources (NFFS) are gaining prominence in goat production due to their high digestibility, low lignin content, and ability to support rumen function while sustaining performance. Ingredients such as soybean hulls, beet pulp, and citrus pulp provide a consistent nutrient supply and greater fermentability compared to traditional forages, reducing reliance on seasonal feed resources.

Their inclusion enhances palatability, minimizes feed sorting, and promotes steady nutrient intake. Importantly, NFFS utilize agro-industrial by-products, lowering feed costs and reducing competition with human food supplies, which adds to their sustainability. Beyond these benefits, NFFS provide fermentable carbohydrates that release energy gradually, ensuring stable rumen fermentation and a continuous supply of volatile fatty acids (VFAs) for growth, lactation, and maintenance. Unlike cereal grains that may trigger sub-acute ruminal acidosis, NFFS ferment more slowly, protecting rumen health and microbial balance.

4. Role of Fibro-lytic Enzymes

Fibro-lytic enzymes, including cellulases and xylanases, supplement the activity of rumen microbes by breaking down cellulose and hemicellulose into fermentable sugars. Although rumen microbes can digest a significant portion of dietary fiber, overall digestibility rarely exceeds 65–70%. Enzyme supplementation extends this limit, enhancing volatile fatty acid production, microbial protein synthesis, and nutrient absorption.

When applied to NFFS-based diets such as soybean hulls, fibro-lytic enzymes accelerate fiber breakdown and improve fermentation efficiency. This not only enhances energy supply but also stabilizes rumen fermentation, reduces undigested fiber excretion, and improves overall feed efficiency.

5. Nutrient Digestibility

5.1 Feed Intake and Dry Matter Intake (DMI)

NFFS like soybean hulls and beet pulp encourage higher DMI due to improved palatability and reduced bulkiness. Fibro-lytic enzymes further increase intake by reducing rumen fill and increasing passage rate, leading to 12–15% higher DMI in enzyme-supplemented goat.

5.2 Fiber Digestibility (NDF and ADF)

Soybean hulls have lower lignin and higher hemicellulose content, improving NDF and ADF digestibility. Enzyme supplementation further enhances fermentation efficiency and energy availability.

5.3 Average Daily Gain (ADG)

Goat fed soybean hull-based TMR with fibro-lytic enzymes exhibit significantly higher ADG due to improved nutrient absorption.

5.4 Feed Conversion Ratio (FCR)

Fibro-lytic enzymes improve FCR by 6–22% in small ruminants, with reductions observed from 8.1 to 6.2 in enzyme-treated diets.

5.5 Feed Efficiency (Gain-to-Feed Ratio)

Gain-to-feed ratio improves substantially in enzyme-supplemented diets due to increased digestible organic matter intake.

5.6 Body Condition Scoring (BCS)

Enzyme-supplemented NFFS diets result in improved BCS, muscle tone, and reproductive efficiency.

5.8 Fecal Score and Digestive Health

Improved rumen stability leads to optimal fecal scores (2–3), indicating better digestive health.

5.9 Sustainability and Broader Implications

Use of NFFS and enzymes reduces feed costs, improves environmental sustainability, and enhances income stability for smallholder farmers.

6. Conclusion

The integration of non-forage fiber sources and fibro-lytic enzymes into goat feeding systems provides an effective pathway to enhance productivity, feed efficiency, and sustainability. Soybean hulls, as a readily available and highly digestible fiber source, offer significant benefits when used in TMR, while fibro-lytic enzymes further enhance fiber utilization and nutrient absorption. Together, these nutritional interventions improve growth, efficiency, and health in goat, contributing to sustainable livestock production and rural prosperity.

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