Why Take a Closer Look?
Homemade “chop” has become one of the most recognizable feeding practices in companion parrot husbandry. A quick scroll through an aviculture group can reveal enormous bowls packed with kale, carrots, peppers, grains, legumes, herbs, berries, and enough brightly colored produce to make most human diets look rather beige.
It certainly looks healthy. But that provides the first clue, and the first problem. A diet can look nutritious without being nutritionally complete.
Rather than asking whether chop looks like good nutrition, this investigation examined what is actually in the bowl. Two questions framed the investigation: Does adding more ingredients make a diet nutritionally complete? Can Chop provide a complete and balanced diet on its own?
Here’s what was found: adding more ingredients did not make the diet nutritionally complete, and the two chop recipes analyzed did not provide a complete and balanced diet on their own.
That is the short version. But the more interesting story is why.
Looking beyond how the food appeared and examining what it actually provided revealed problems that are easy to miss from an ingredient list alone. Some nutrients were present but not in adequate amounts. Others raised questions about how much the bird could actually use. The amount of food a parrot would need to consume created an entirely different problem. And then there was the parrot itself, which does not necessarily eat the same diet that was placed into the bowl.
What Was Tested
Two independently prepared organic chop recipes were selected for commercial nutrient analysis (See Addendum for full recipe information). One was a popular seasonal recipe. The other was a widely circulated recipe published in a large online companion bird community. Does this represent all possible combinations of fresh food items that could be fed to your pet bird? Absolutely not – that was not the intent of this effort, but rather to evaluate two very common recipes that are readily found with a quick internet search.
Each recipe was submitted to a certified independent laboratory immediately after preparation, with a second submission held for three weeks of continuous frozen storage. The values reported here are from the fresh submissions (See Addendum for nutrient analyses). Note that the analyzed values are reported after the water content has been removed – so that recipes with different overall moisture can be compared. These recipes provided two real-world examples with which to test some of the assumptions surrounding one of the most popular feeding practices in companion parrot husbandry.
What Does “Nutritionally Complete” Actually Mean?
Both recipes contained a wide variety of foods and many of the nutrients expected from those ingredients. But simply detecting a nutrient does not establish that enough is present, that it occurs in the correct proportion to other nutrients, or that the bird can actually use it.5,6
For several nutrients, the fresh recipes are balanced, at least on paper. Protein (analyzed) and amino acids (calculated based on published USDA data) were within recommended levels for poultry (NRC, 2026). Several minerals (iron, zinc, sodium) were also within recommended levels. The presence of good levels of beta-carotene are promising for a psittacine diet. However, the levels of several nutrients presented significant concerns.
Calcium and phosphorus provide a good example. Both were present, but calcium was quite low and more than 50% below published nutrient requirements for poultry (the closest model species for which nutrient requirements are well established) (NRC, 2026). More importantly the calcium-to-phosphorus ratio was below 1:1 in every sample, which presents the potential for bone problems even if the total calcium level met the birds needs.. Iodine and selenium were not detected, which means that if those nutrients were present, they were too low for the lab to reliably measure, and are below recommended intake levels.
Vitamin D3 and vitamin E were also below laboratory reporting limits in every sample tested, meaning birds eating these recipes as their sole food source are likely not getting adequate amounts of either nutrient
For a food intended to be the sole source of nutrition, that matters. A complete diet has to do more than contain an impressive collection of wholesome ingredients. It has to reliably provide every essential nutrient in an adequate amount.
But the biggest finding in the investigation was not an individual vitamin or mineral.
Can a Parrot Actually Eat Enough?
Vegetable-heavy chop contains a lot of water. There is nothing inherently wrong with that, but water takes up space without providing calories. That makes these mixtures bulky and relatively low in energy for every gram of food consumed.
Consider a 200 g companion parrot with an estimated daily energy requirement of roughly 55 kcal. To meet that requirement using the chop recipes analyzed as the sole food source, that bird would need to consume approximately 90 to 130 grams of chop every day.
That is approximately 45% to 65% of the bird’s entire body weight in food every day. For a human comparison, a 150 lb person consuming the same proportion of body weight would need to eat roughly 68 to 98 pounds of food every day.
Suddenly, the problem becomes much easier to see. The bird may simply be unable to eat enough.
For comparison, reported food intakes for similarly sized birds consuming pellets/nuggets and other lower-moisture foods are more typically around 30 to 45 g per day. If a bird cannot consume enough of a diet to meet its energy requirement, it cannot reliably consume enough of the nutrients in that diet either. Adding a calcium source or correcting an individual vitamin does not solve the whole problem. The diet may be so dilute that the bird reaches the limit of how much food it can consume before reaching the calories and nutrients it needs.
This is also why a full food bowl can be misleading. A bird can have food available all day and still fail to consume enough energy. During a dietary transition, body weight and body condition may provide considerably more information about actual intake than the amount of food remaining in the bowl.
Even that calculation, however, assumes the bird eats the chop exactly as prepared.
What Is Offered vs. What Is Eaten
Anyone familiar with parrots can probably anticipate the next problem. Parrots have opinions.
The laboratory analyzed a composite containing everything in each recipe. A parrot presented with that same mixture may dig through it for corn, grains, legumes, fruit, or another preferred ingredient while leaving leafy greens and fibrous vegetables behind. When captive Amazon parrots were offered produce, formulated diet, and seed together, the diets they actually consumed were deficient in calcium, sodium, and iron, and the birds selected in a way that made those imbalances worse.4 Fine chopping can make this more difficult, but it does not eliminate it.
This is selective feeding, and it creates an important distinction: there are really two diets to consider: the diet offered and the diet the bird actually eats. A laboratory can determine what was present in the entire mixture. It cannot guarantee that a bird consumed those ingredients in the same proportions.
Selective feeding can therefore take whatever nutritional profile exists on paper and change it further. Even a theoretically balanced mixture could become unbalanced if the bird consistently rejects certain components. And if an essential nutrient is already present at an inadequate concentration in the entire mixture, selective feeding cannot put it back.
This is one of the structural differences between chop and a formulated extruded diet. When ingredients and nutrients are ground, blended, and incorporated into a uniform particle, the bird cannot select one preferred ingredient while leaving its accompanying nutrient sources behind. The nutrient profile travels together.
Where Chop Fits
Does this mean chop is bad?
No.
Science does not require every feeding practice to become a hero or a villain. The evidence can instead help define where that practice actually fits. Chop can be a useful way to offer fresh vegetables, expand dietary variety, introduce unfamiliar foods, and improve acceptance of produce.
One common concern can be set aside. Each recipe was also analyzed after three weeks of continuous frozen storage, and freezing had no effect on the nutrient content measured (data not shown). This is consistent with a large body of human food research:1,2 light, heat, and oxygen are what degrade nutrients, and short-term freezing avoids all three. That literature also cautions that changes in moisture content can misrepresent changes in nutrient content, which is why values here are reported on a dry matter basis.3 The nutrients missing from these recipes were missing or imbalanced before anything went into the freezer, and no storage method corrects that.
What chop should not automatically be assumed to be is complete. Fresh is not the same as complete. Organic is not the same as complete. Homemade is not the same as complete. And a recipe containing twenty ingredients is not necessarily nutritionally superior to one containing ten.
Those descriptions do not establish whether every essential nutrient is present in the right amount and proportion, whether the bird can absorb those nutrients, whether the diet contains enough energy for the bird to meet its requirements, or whether the bird actually eats the food in the proportions intended.
For companion parrots, chop is therefore most defensibly positioned as one component of a feeding program built on a nutritionally complete foundation,not assumed to be that foundation itself.
What Fresh Produce Does Well
Fresh produce earns its place in the bowl for reasons that have nothing to do with completing the nutrient profile.
Foraging is the most important. Wild parrots spend a substantial portion of the day locating, manipulating, and processing food, and foraging enrichment is among the most effective ways to promote species-typical behavior and prevent abnormal repetitive behaviors in captivity.7,8 Captive parrots remain motivated to handle and process food even when the diet does not require it, and thwarting that motivation is associated with feather-damaging behavior.9,11 Whole or coarsely cut vegetables can be skewered, hung, hidden, or presented in ways that require work to access, which recreates some of that activity. Finely chopped produce in a bowl is convenient, but it removes much of the manipulation that makes fresh foods behaviorally valuable in the first place.
Offering a variety of items also allows birds some latitude to select among them. Nutritional wisdom is limited and unreliable in captive parrots, and it is not a substitute for a formulated diet, but where it operates at all it requires choices to be available.
The water content that creates the energy-density problem also has a use. High-moisture foods contribute volume and a sense of gut fullness without contributing many calories, which can be helpful for birds prone to weight gain or for birds that want to eat throughout the day.
None of these benefits depend on the produce being nutritionally complete. They are reasons to offer fresh foods alongside a complete diet, not reasons to expect fresh foods to replace one.
Wild Diets and Grocery Store Produce
Some owners feed chop because it seems closer to what a parrot would eat in the wild. That assumption deserves examination, because modern produce is not a good proxy for wild forage.
Fruits and vegetables sold for human consumption have been selectively bred for sweetness, size, yield, shelf life, and appearance.12 The result is produce that is higher in sugar and lower in fiber than the wild fruits, seeds, flowers, leaves, and vegetation parrots evolved to eat.13 A wild fig and a supermarket grape have little in common nutritionally.14
A bowl of grocery store produce is therefore not a wild diet in miniature. It is a modern food supply arranged to look like one. This does not make fresh produce a poor choice, but it does mean that “closer to nature” is not a reason to expect it to meet a bird’s nutritional requirements.
Where Fresh Vegetables Fit
There is another important distinction. “Chop” is not a standardized diet. There is no single recipe, ingredient list, preparation method, or nutrient profile that defines it. One version of chop may be primarily leafy greens and vegetables, while another may contain substantial amounts of grains, legumes, fruit, seeds, nuts, or other ingredients.
That variability makes “chop” a difficult term to use when making specific feeding recommendations.
Harrison’s firmly supports the inclusion of fresh organic vegetables as part of a feeding program built around Harrison’s nuggets and pellets.
Fresh vegetables bring something different to the bowl. Different tastes, textures, shapes, and colors provide opportunities for enrichment and exploration. Fresh vegetables also contribute additional nutrients, not because they are expected to create a balanced nutritional profile, but because they can provide additional nutritional value alongside a complete formulated diet.
Most fresh vegetables are also relatively low in caloric density, making appropriate amounts less likely to translate that additional dietary variety into excessive calorie intake.
For most companion parrots eating Harrison’s nuggets or pellets, Harrison’s recommends that fresh vegetables make up approximately 20% of the total volume of food offered each day.
The distinction is important: fresh vegetables are offered alongside the nutritionally complete diet, not in place of it. Harrison’s nuggets and pellets provide the nutritional foundation. Fresh vegetables add variety, enrichment, and additional nutritional value without being expected to provide complete nutrition.
Harrison’s recommendation is therefore not to construct a more elaborate chop recipe.
The approach is much simpler: start with a nutritionally complete foundation, then make room in the bowl for fresh vegetables.
As with any general feeding guideline, the 20% recommendation does not replace an individualized nutrition plan or specific recommendations from the bird’s veterinarian.
Putting This Into Practice
Knowing what goes into the bowl is only the beginning. A useful diet history should consider approximately how much of each component is offered, how the food is prepared, whether supplements are added, how much of the total diet each component represents, what the bird actually consumes, and what consistently ends up discarded.
The bird itself also provides important information. Body weight and body condition should be monitored during dietary changes because weight loss can occur while the food bowl still looks full.
The opposite problem is possible as well. Chop recipes containing larger amounts of grains, legumes, nuts, seeds, or dried fruit may be considerably more energy dense than the vegetable-heavy recipes analyzed and could contribute to excess caloric intake without appropriate portion control.
Species matters too. Lories, toucans, softbills, pigeons, raptors, nectarivores, frugivores, and other birds with specialized feeding physiology should not simply be placed into the same nutritional framework as companion parrots with different feeding strategies.10
What the Evidence Shows
A better question than “Does this look healthy?” is “What does it actually provide?”
A better question than “How many healthy ingredients are in it?” is “Does it provide all of the nutrients the bird needs?”
And rather than considering only what went into the bowl, nutritional assessment must also consider what the bird actually ate. That is how husbandry improves. Observations lead to questions. Assumptions are tested. Evidence either supports those assumptions or provides a reason to change them.
Two questions about chop started this investigation. Does adding more ingredients make it nutritionally complete? No. Can chop provide a complete and balanced diet on its own? Not based on the evidence found in these recipes. The mystery was never whether vegetables are good for parrots.
The mystery was whether a bowl full of good ingredients automatically adds up to a complete diet.
It doesn’t.
References
- Bouzari A, Holstege D, Barrett DM. Vitamin retention in eight fruits and vegetables: a comparison of refrigerated and frozen storage. J Agric Food Chem. 2015;63(3):957–962.
- Li L, Pegg RB, Eitenmiller RR, et al. Selected nutrient analyses of fresh, fresh-stored, and frozen fruits and vegetables. J Food Compos Anal. 2017;59:8–17.
- Rickman JC, Barrett DM, Bruhn CM. Nutritional comparison of fresh, frozen and canned fruits and vegetables. Part 1. Vitamins C and B and phenolic compounds. J Sci Food Agric. 2007;87(6):930–944.
- Brightsmith DJ. Nutritional levels of diets fed to captive Amazon parrots: does mixing seed, produce, and pellets provide a healthy diet? J Avian Med Surg. 2012;26(3):149–160.
- Kalmar ID, Janssens GPJ, Moons CPH. Guidelines and ethical considerations for housing and management of psittacine birds used in research. ILAR J. 2010;51(4):409–423.
- Koutsos EA, Matson KD, Klasing KC. Nutrition of birds in the order Psittaciformes: a review. J Avian Med Surg. 2001;15(4):257–275.
- van Zeeland YRA, Schoemaker NJ, Ravesteijn MM, et al. Efficacy of foraging enrichments to increase foraging time in Grey parrots (Psittacus erithacus erithacus). Appl Anim Behav Sci. 2013;149:87–102.
- Rodríguez-López R. Environmental enrichment for parrot species: are we squawking up the wrong tree? Appl Anim Behav Sci. 2016;180:1–10.
- Mellor EL, McDonald Kinkaid HK, Mendl MT, et al. Nature calls: intelligence and natural foraging style predict poor welfare in captive parrots. Proc R Soc B. 2021;288:20211952.
- Baldrey V, Rowland M, Forbes NA. Understanding the behavioural challenges of companion parrots. In Practice. 2024;46(4):200–210.
- Meehan CL, Millam JR, Mench JA. Foraging opportunity and increased physical complexity both prevent and reduce psychogenic feather picking by young Amazon parrots. Appl Anim Behav Sci. 2003;80(1):71–85.
- Meyer RS, DuVal AE, Jensen HR. Patterns and processes in crop domestication. New Phytol. 2012;196(1):29–48.
- Yiblet Y. Nutritional composition and antinutritional factors of five wild edible fruits grown in the Mekdela District, South of Wollo, Ethiopia. Int J Food Sci. 2024;2024:9980936.
- Association of Zoos and Aquariums Nutrition Advisory Group. Zoo nutrition myth: a fruit is a fruit. Available at: nagonline.net.
Addendum: Recipe Composition and Nutrient Analysis
Companion data to “CHOP: Using Science and Critical Thinking to Investigate a Popular Parrot Feeding Practice”
How to Read These Tables
Each recipe is shown two ways. Calculated values add up what the ingredients should contain based on published USDA food data; analyzed values are what the laboratory measured in the actual sample. The two can differ because real produce varies from published averages.
Both recipes were tested as prepared, water and all. Because they contain different amounts of water, those raw numbers cannot be compared to each other. To compare two diets, the moisture has to be removed, which is what a dry matter basis does.
Not detected means the amount present was too small for the laboratory to measure. It does not mean zero. It also works the other way: a nutrient that was detected is not automatically present in an adequate amount.
Recipe 1
17 ingredients · 82–83% water
Vegetables 64% · Grains 20% · Legumes 16%
| Ingredient | % of recipe | g per 100 g batch |
| Vegetables | ||
| Summer squash | 21.6% | 21.6 g |
| Cauliflower | 14.6% | 14.6 g |
| Beets | 6.2% | 6.2 g |
| Green beans | 5.8% | 5.8 g |
| Zucchini | 5.1% | 5.1 g |
| Spinach | 4.3% | 4.3 g |
| Radishes | 2.5% | 2.5 g |
| Collard greens | 2.4% | 2.4 g |
| Red chili peppers | 1.5% | 1.5 g |
| Grains and pasta | ||
| Macaroni, cooked | 5.4% | 5.4 g |
| Brown rice, cooked | 5.0% | 5.0 g |
| Spelt, cooked | 4.9% | 4.9 g |
| Millet, cooked | 4.4% | 4.4 g |
| Legumes | ||
| Lentils, cooked | 5.0% | 5.0 g |
| Navy beans, cooked | 4.6% | 4.6 g |
| Chickpeas, cooked | 4.2% | 4.2 g |
| Adzuki beans, cooked | 2.4% | 2.4 g |
Amounts are as-prepared weight, water included — cooked grains and legumes are weighed cooked, not dry. Because the composition is expressed by weight, grams per 100 g are numerically the same as the percentages. Listed values sum to 99.9 g rather than exactly 100 g because of rounding.
Recipe 2
13 ingredients · 84–86% water
Vegetables 46% · Fruit 21% · Legumes 19% · Grains 13%
| Ingredient | % of recipe | g per 100 g batch |
| Vegetables | ||
| Summer squash | 10.1% | 10.1 g |
| Zucchini | 10.1% | 10.1 g |
| Radishes | 6.1% | 6.1 g |
| Kale | 4.7% | 4.7 g |
| Okra | 4.7% | 4.7 g |
| Collard greens | 4.0% | 4.0 g |
| Jalapeños | 3.4% | 3.4 g |
| Turnip greens | 3.4% | 3.4 g |
| Fruit | ||
| Apples | 14.8% | 14.8 g |
| Mango | 6.4% | 6.4 g |
| Legumes | ||
| Chickpeas, cooked | 15.5% | 15.5 g |
| Lentils, cooked | 3.4% | 3.4 g |
| Grains | ||
| Oatmeal, Cooked | 13.5% | 13.5 g |
Amounts are as-prepared weight, water included — cooked grains and legumes are weighed cooked, not dry. Because the composition is expressed by weight, grams per 100 g are numerically the same as the percentages. Listed values sum to 100.1 g rather than exactly 100 g because of rounding.
Nutrient Analysis, Dry Matter Basis
Energy and macronutrients
| Recipe 1 calc | Recipe 1 analyzed | Recipe 2 calc | Recipe 2 analyzed | |
| Metabolizable energy, kcal/kg | 3,388 | 3,220 | 3,532 | 3,414 |
| Moisture, % (as fed) | 82.1 | 83.2 | 83.7 | 86.3 |
| Crude protein, % | 20.3 | 20.5 | 17.3 | 16.5 |
| Crude fat, % | 2.8 | 4.2 | 4.9 | 6.3 |
| Crude fiber, % | 2.2 | 9.0 | 2.1 | 6.9 |
| Linoleic acid, % | 0.76 | — | 1.71 | — |
Amino acids
Not measured by the laboratory panel. Calculated values only (USDA).
| Recipe 1 | Recipe 2 | Nutrient reqts of adult turkeys at maintenance (NRC 2026) | |
| Arginine, % | 1.07 | 1.29 | 0.50 |
| Lysine, % | 1.13 | 1.06 | 0.50 |
| Methionine, % | 0.23 | 0.22 | 0.20 |
| Methionine + cystine, % | 0.46 | 0.49 | 0.40 |
| Threonine, % | 0.65 | 0.61 | 0.40 |
| Tryptophan, % | 0.21 | 0.18 | 0.10 |
Minerals – All reported on a dry matter basis. Limit of detection for iodine and selenium at 0.1 mg/kg.
| Recipe 1 calc | Recipe 1 analyzed | Recipe 2 calc | Recipe 2 analyzed | Nutrient reqts of adult turkeys at maintenance (NRC 2026) | |
| Calcium, % | 0.20 | 0.24 | 0.26 | 0.29 | 0.65 |
| Phosphorus, % | 0.42 | 0.36 | 0.38 | 0.36 | 0.35* |
| Calcium : phosphorus | 0.46 | 0.67 | 0.67 | 0.81 | 1.85 |
| Sodium, % | 0.14 | 0.12 | 0.05 | 0.15 | 0.12 |
| Iron, mg/kg | 70.0 | 45.8 | 60.3 | 59.8 | 50.0 |
| Zinc, mg/kg | 36.5 | 36.3 | 27.5 | 43.8 | 40.0 |
| Copper, mg/kg | 7.58 | 6.6 | 8.02 | not detected | 6.0 |
| Iodine, mg/kg | no data | not detected | no data | not detected | 0.4 |
| Selenium, mg/kg | 0.03 | not detected | 0.06 | not detected | 0.20 |
Vitamins– All reported on a dry matter basis. Limit of detection for vitamin D3 at 2 IU/kg and for vitamin E at 20 IU/kg.
| Recipe 1 calc | Recipe 1 analyzed | Recipe 2 calc | Recipe 2 analyzed | Nutrient reqts of adult turkeys at maintenance (NRC 2026) | |
| Vitamin A in the form of beta-carotene, IU/kg | 74 | 18,000 | 4,673 | 27,000 | 5,000 |
| Vitamin D3, IU/kg | no data | not detected | no data | not detected | 1,100 |
| Vitamin E, IU/kg | 11.7 | not detected | 27.7 | not detected | 10.0 |
| Thiamin, mg/kg | 9.4 | — | 4.3 | — | 2.0 |
| Riboflavin, mg/kg | 10.3 | — | 4.2 | — | 2.5 |
| Niacin, mg/kg | 47.9 | — | 30.4 | — | 40 |
| Folic acid, mg/kg | 3.18 | — | 1.80 | — | 0.70 |
| Choline, mg/kg | 971 | 2,170 | 829 | 1,250 | 800 |
— not measured