Fruit and vegetable farm waste can feed livestock and poultry effectively when used at the right amounts and prepared correctly, according to Gram Research analysis of multiple studies. Research shows that appropriate inclusion of materials like potato residues, tomato pomace, and watermelon rinds improved or maintained animal growth, milk production, and digestibility. However, using too much waste or improper preparation can reduce animal feed intake and growth rates, so careful species-specific guidelines are essential.
Farms produce tons of leftover fruits and vegetables every year, and researchers are exploring whether this waste could become animal feed. According to Gram Research analysis, a new review of dozens of studies shows that fruit and vegetable scraps like potato peels, tomato waste, and pumpkin seeds can safely feed livestock and poultry when prepared correctly. The findings suggest this approach could reduce farming costs, cut down on waste going to landfills, and help the environment. However, the amount used matters greatly, and different animals respond differently to these alternative feeds.
Key Statistics
A 2026 review of horticultural waste as livestock feed found that fruit and vegetable by-products including avocado residues, mango waste, tomato pomace, and potato peels can improve animal growth and feed efficiency when used at appropriate inclusion levels.
Research shows that processing methods such as drying, fermenting, and pelleting can improve the storage characteristics of horticultural waste and may enhance nutrient availability for livestock, though effectiveness depends on the specific material and process used.
Studies examined in the review found that excessive inclusion of horticultural waste reduced dry matter intake, average daily gain, digestibility, and carcass quality in livestock, demonstrating that careful inclusion limits are critical for animal performance.
The review identified that horticultural waste represents a sustainable alternative feed resource with potential environmental benefits through reduced landfill disposal and economic benefits through lower feed costs for farmers.
The Quick Take
- What they studied: Whether leftover fruits and vegetables from farms can be used as feed for livestock and poultry, and how to prepare them so animals stay healthy and grow well.
- Who participated: This was a review article that examined findings from many different studies on this topic. No single group of animals was studied; instead, researchers looked at what other scientists had already discovered.
- Key finding: Fruit and vegetable waste can work as animal feed at the right amounts, but using too much can slow animal growth and reduce how well they digest food. The type of waste, how it is processed, and the animal species all affect whether it works well.
- What it means for you: If you raise livestock or poultry, farm waste could lower your feed costs and help the environment. However, you need to follow careful guidelines about how much to use and how to prepare it based on your specific animals.
The Research Details
This research is a review article, which means scientists read and analyzed dozens of existing studies on the same topic instead of conducting one new experiment. The researchers looked at studies examining different types of farm waste, including avocado residues, mango scraps, tomato pomace (the leftover pulp), watermelon rinds, potato peels, and mushroom waste. They examined how these materials were processed (dried, fermented, or turned into pellets) and what happened when farmers fed them to different animals like cattle, poultry, and other livestock. The review focused on how these waste products affected animal growth, milk production, digestion, and overall health. By comparing results across many studies, the researchers could identify patterns about what works and what does not.
A review approach is valuable here because no single study could test all the different types of waste, processing methods, and animal species. By examining many studies together, researchers can see the big picture and understand which approaches are most promising. This helps farmers make decisions based on evidence rather than guessing.
This review was published in a peer-reviewed journal, meaning other experts checked the work before publication. However, because it summarizes other studies rather than conducting new research, the quality depends on the studies it reviewed. The findings show that results vary widely depending on specific conditions, which means farmers need to be careful about applying these findings to their own situations. The review notes that more research is needed to establish clear guidelines for different animal types.
What the Results Show
The review found that fruit and vegetable waste can be used as animal feed with positive or neutral effects on animal performance when used at appropriate levels. Many studies showed improvements or no harmful effects on growth rate, feed efficiency, milk production, how well animals digest food, and gut health. However, the results were not consistent across all studies. When farmers used too much waste or did not prepare it correctly, animals ate less food, grew more slowly, gained less weight, or had worse meat quality. The type of waste mattered significantly. Some materials like potato residues and pumpkin seed meal showed more promise than others. Processing methods such as drying, fermenting, and pelleting could improve how long the feed lasted in storage and how well animals could use the nutrients, but the effectiveness depended on the specific material and process used. Different animal species responded differently to the same waste products, meaning what works for chickens might not work the same way for cattle.
The review highlighted that horticultural waste could provide environmental and economic benefits beyond just feeding animals. Using this waste reduces the amount of material going to landfills, which decreases greenhouse gas emissions and pollution. For farmers, using waste as feed could lower feed costs, which is important as conventional feed prices continue to rise. The nutritional content of fruit and vegetable waste varies depending on the source and how it is processed. Some waste products contain valuable nutrients like fiber and minerals, while others may contain compounds that could be harmful if used in large amounts. The review also noted that feed safety is important, as some waste could contain pesticides or other contaminants if not sourced carefully.
This review builds on growing interest in sustainable farming practices. Previous research has explored various alternative feeds, but this comprehensive review brings together findings specifically about horticultural waste. The results align with earlier studies showing that alternative feeds can work but require careful management. The review confirms what many farmers have suspected: waste products are not a one-size-fits-all solution. It adds to the evidence that sustainable feeding practices are possible but need to be tailored to specific situations.
The review examined many studies, but those studies had different methods and quality levels, making it hard to draw firm conclusions. The researchers noted that results varied considerably depending on animal species, waste type, processing method, and how much was used. This means the findings cannot be easily applied to all situations. The review did not include new experimental data, so it relies on what other researchers have already published. Some types of waste and animal species may not have been studied as thoroughly as others. The review also notes that more research is needed to establish clear, practical guidelines for farmers about exactly how much waste to use and how to prepare it for different animals.
The Bottom Line
Farmers interested in using horticultural waste as animal feed should start by researching which waste types are available locally and which animals they raise. Begin with small amounts and monitor animal health, growth, and feed intake carefully. Work with a veterinarian or animal nutritionist to develop a feeding plan tailored to your specific animals and waste sources. Processing the waste through drying, fermenting, or pelleting can improve results. These recommendations have moderate confidence because results vary based on many factors, but the evidence suggests the approach can work when done carefully.
Livestock and poultry farmers should pay attention to these findings, especially those looking to reduce feed costs or improve sustainability. Small-scale farmers may benefit most from using locally available waste. Large commercial operations may need to evaluate whether the logistics of collecting and processing waste make economic sense. Farmers in areas with large horticultural industries have the best opportunity to access consistent waste supplies. Environmental advocates interested in reducing farm waste and greenhouse gas emissions should also find this research relevant. However, farmers raising animals with very specific nutritional needs or those in regions with limited waste availability may find this approach less practical.
If a farmer decides to use horticultural waste as feed, they should expect to see results within weeks to months. Initial changes in animal feed intake might appear within days. Effects on growth rate, milk production, or meat quality typically become visible within 4 to 12 weeks, depending on the animal species and the amount of waste used. However, establishing a sustainable system that works well for a specific farm may take several months of adjustment and monitoring.
Frequently Asked Questions
Can I feed my chickens vegetable scraps from my garden?
Yes, vegetable scraps can supplement chicken feed, but they should not be the only food source. Research shows small amounts of waste like cabbage, carrots, and pumpkin can work well. Start with 5 to 10 percent of their total diet and monitor their health and egg production.
What is the best way to prepare farm waste before feeding it to livestock?
Drying, fermenting, or pelleting farm waste improves storage and nutrient availability. Drying removes moisture so it lasts longer. Fermenting preserves nutrients and improves digestion. The best method depends on your waste type and available equipment. Consult a veterinarian for guidance.
How much horticultural waste can I safely add to livestock feed?
Safe amounts vary by animal species and waste type, but research suggests starting with 5 to 15 percent of total feed. Higher amounts may reduce animal growth and feed intake. Monitor your animals closely and adjust based on their response. Work with a nutritionist for specific guidance.
Will using vegetable waste as animal feed save me money?
Potentially yes. Using locally available horticultural waste can reduce feed costs significantly. However, you must account for collection, processing, and storage expenses. The savings depend on waste availability in your area and your current feed costs.
Are there any safety concerns with feeding animals fruit and vegetable waste?
Yes, waste could contain pesticides or contaminants if not sourced carefully. Source waste from known, safe suppliers. Avoid moldy or spoiled material. Ensure proper processing and storage to prevent bacterial growth. Consult your veterinarian about safety for your specific situation.
Want to Apply This Research?
- Track the percentage of horticultural waste included in your animal feed daily, along with weekly measurements of animal weight gain, feed intake, and milk production if applicable. Record which waste types you use and how they were processed.
- Start by sourcing one type of local horticultural waste (such as potato peels or vegetable trimmings) and incorporate it into your feed at 5 to 10 percent of total feed. Monitor your animals closely for the first month, then gradually adjust the amount based on how they respond.
- Create a simple spreadsheet tracking weekly animal performance metrics, waste sourcing costs, and total feed expenses. Compare months when you use waste-supplemented feed to baseline months. Photograph animals monthly to visually track growth and health. Set a monthly check-in to review whether the approach is working for your operation.
This review summarizes research on using horticultural waste as animal feed but does not constitute veterinary or nutritional advice. Before incorporating farm waste into your livestock or poultry diet, consult with a veterinarian or animal nutritionist familiar with your specific animals and local conditions. Results vary based on animal species, waste type, processing methods, and inclusion levels. Improper use of horticultural waste may negatively affect animal health, growth, and productivity. Ensure all waste sources are safe, properly processed, and free from contaminants such as pesticides or mold. Individual animal responses may differ from research findings.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.