Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.7 Best Horse Feed For Weight Gain | Fill Your Hard Keeper

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Horse Guard designed this supplement to solve three problems at once — weight gain, coat condition, and digestive stability. The star ingredient is full-fat extruded soybeans, which deliver a dense calorie load of 36% crude fat while also providing the amino acid profile needed to rebuild a sagging topline. The inclusion of probiotics and prebiotics sets it apart from simpler fat-based formulas, as it actively supports hindgut health to maximize nutrient absorption. This is especially valuable for senior horses, rescues, or any animal recovering from illness or neglect.

The vitamin-mineral package in this blend includes 1,500 IU of Vitamin E per serving, which bolsters immune function in horses that are metabolically stressed. This matters because underweight horses often have weakened immune systems, creating a cycle where they cannot gain weight because they are fighting off low-grade infections. The crude protein sits at a muscle-supportive level, making this more than just a calorie bomb — it is a systemic recovery tool. Each 10 lb bag provides roughly 20 servings for a 1,000 lb horse, and a scoop is included for consistent dosing.

In terms of palatability, the extruded soy has a naturally appealing taste and smell that most horses accept readily. It can be top-dressed or mixed into a wet feed. The only real consideration is that it is a granule form, so horses that are extremely picky about texture may need a brief transition period. For owners managing multiple horses on different feeding schedules, the easy-scoop design and resealable bag make daily use practical.

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Farnam’s Weight Builder is a heavy hitter when you need rapid calorie density without increasing your horse’s grain ration. The guaranteed analysis shows a staggering 50% crude fat, sourced from flaxseed meal and heat-stabilized rice bran, which provides over 4% omega-3 fatty acids per serving. These omega-3s do more than just add calories — they reduce systemic inflammation and drive a glossy coat condition that visually confirms the horse is metabolically thriving. The formula contains no added sugar, which eliminates the risk of the starch-related gut upset that plagues traditional “grain-loading” strategies.

At a 4 oz per day serving size for a 1,000 lb horse, this 7.5 lb bucket provides exactly 30 days of supplementation. That predictable math makes it easy to budget and track. The alfalfa-flavored powder mixes into a wet grain ration with minimal dust, and the manufacturer recommends a slow, step-up introduction over the first week to allow the horse’s digestive enzymes to adapt to the high fat load. Horses recovering from parasite loads, tooth issues, or dental work benefit from this approach because they get concentrated calories without needing to chew large volumes of feed.

The main trade-off is that 50% fat means a relatively low protein content. If your horse needs significant muscle rebuilding alongside weight gain, you may want to pair this with a protein-top-up or choose a more balanced formula. However, for pure weight addition on a horse that is already on decent hay, this is one of the most efficient tools available.

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Liquid oils are a completely different category of weight-gain tool, and the DAC Oil Gallon Jug offers one of the most straightforward options on the shelf. This is a fish-based oil fortified with Vitamin E, designed to be poured directly over hay or mixed into a grain meal. The liquid form allows you to control the exact volume of calories you add each day, making it ideal for owners who want to fine-tune their horse’s energy balance. Fish oil delivers a unique profile of DHA and EPA omega-3s that are particularly effective at reducing systemic inflammation.

For horses that have trouble maintaining weight due to chronic low-grade inflammation (common in older horses with arthritis or metabolic syndrome), the anti-inflammatory effect of fish oil can remove the hidden calorie drain. The Vitamin E addition prevents the oil from oxidizing in the body, protecting muscle cell membranes during the weight-gain process. A gallon jug provides a long-term supply, making the cost per serving quite efficient for a premium ingredient. The oil pours easily even in cooler weather and does not require refrigeration.

Palatability can be a consideration with fish oil. Most horses accept it readily when it is mixed into a meal, but a few are sensitive to the smell. It is best to start with a small drizzle and increase gradually. Because this is a pure oil, it does not provide any protein or fiber, so it should be used alongside a balanced diet and possibly a separate protein supplement for comprehensive topline support.

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Formula 707 is a legacy name in equine nutrition — the brand has been formulating supplements since 1948. Their Weight Gain Crumble uses vegetable fat as the primary calorie source, paired with high-quality protein to provide essential amino acids for muscle building. The crumble texture sets it apart from powders and pellets; it is dry and slightly oily to the touch, making it easy to feed straight from the scoop without additional mixing. Horses that are slow eaters tend to take crumbles more readily than fine powders.

The inclusion of fiber in the formula serves a specific purpose: it slows the passage of feed through the digestive tract, giving the horse more time to absorb nutrients. For horses with a history of hindgut acidosis or ulcer sensitivity, this fiber buffer is a significant safety advantage. The vegetable fat provides cool energy, meaning it will not cause the hot, spooky behavior that sometimes accompanies high-starch grain loads. This makes the crumble a solid choice for performance horses that need to maintain weight during training without becoming excitable.

The 7 lb bag is a manageable size for a single horse about a month’s supply, depending on the feeding rate. Owners should be aware that the crumble consistency means it does not dissolve in water, so if your horse prefers a wet mash, you will need to mix it into soaked beet pulp or a similar base. It is not a complete feed, so ensure your hay or pasture provides the bulk of daily roughage.

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DAC Bloom takes a more holistic approach by supporting weight gain alongside hoof quality, skin health, and coat condition all in one bucket. The 5 lb size is notably compact, making it a practical choice for owners who travel with their horses, board them at facilities where storage space is limited, or simply want to try a new supplement without committing to a massive bag. The formula targets body condition through a calorie-dense fat profile while additional ingredients support biotin-responsive hoof growth.

For horses that are underweight but also have brittle hooves or dry, flaky skin, this two-in-one approach can replace the need for separate hoof and coat supplements. The concentrated nature of the product means a little goes a long way per serving, extending the useful life of the 5 lb container. It is designed to be top-dressed on the existing grain ration, and most horses accept it without issue due to its palatable base. The manufacturer, DAC, has a reputation for solid quality control in the equine supplement space, with many barn owners trusting their products for daily use.

The primary limitation is the total calorie load per serving compared to specialized high-fat products. If your horse needs to gain weight aggressively, Bloom may be better used as a maintenance or light support product rather than a heavy-duty weight builder. It shines brightest as a general condition improver for horses that just need a small calorie nudge plus hoof and skin support.

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Manna Pro Cool Calories 100 contains 99% fat, making it the most concentrated calorie source on this list. It is essentially a dry fat supplement designed to be added directly to the feed without increasing the volume of grain the horse eats. For horses that already receive a full ration of hay and grain but still fail to gain weight, this is the most direct way to inject additional energy into the diet without overwhelming the digestive system with more bulk. The term “cool energy” refers to the fact that fat calories do not cause the hot, nervous behavior associated with high-starch feeds, making it suitable for performance horses.

The 8 lb bag may seem modest, but because the product is so concentrated, a little goes much further than with bulkier supplements. The fat profile also contains fatty acids that work on skin and coat condition, providing a visible secondary benefit. The dry form is easy to store, does not spoil as quickly as liquid oils, and can be pre-measured for convenience. Many barn managers use Cool Calories 100 as a standard top-dress for hard-keeping horses during the winter months when maintaining body condition becomes a daily battle.

The only downside is that the extremely high fat content delivers minimal protein. If your horse needs significant muscle rebuilding or is recovering from a serious condition, you will need to combine this with a protein-rich feed or supplement. It is best understood as a straight energy additive rather than a complete nutritional solution. Additionally, the fat source can become sticky in warm weather, so storing it in a cool, dry place is important.

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Weruva’s Wx Phos Focused line is a wet food designed around a low-phosphorus nutritional profile for horses with kidney concerns or metabolic issues that require careful mineral management. It provides highly bioavailable proteins to help maintain muscle mass while keeping phosphorus levels up to 50% below the AAFCO minimum. This is a niche but critical product for horses that need weight support but cannot tolerate the high phosphorus load of traditional fat-based supplements or grain-heavy diets. The low phosphorus design supports kidney function, which can be compromised in older horses.

The formula is free from powdered cellulose, fillers, and excess carbohydrates that artificially lower phosphorus percentages on paper while providing no real nutritional value. The protein sources used are bone-free and highly digestible, reducing the waste load on the kidneys. The gravy and pate variety pack offers texture options for horses with dental issues or reduced appetite. It is also corn-free, grain-free, and soy-free, making it suitable for horses with multiple food sensitivities.

This product comes in a 3 oz can size with 12 cans per pack, so it is intended as a supplement or top-dress rather than a primary calorie source. The total calorie load per serving is lower than dedicated weight gain supplements, so it works best for maintenance or gentle encouragement rather than rapid weight gain. It is also a cat food product, so make sure you are purchasing with the understanding of using it as a high-protein, low-phosphorus treat or topper for your horse under veterinary guidance.