Feeding Poultry in Australia

Poultry — chickens, ducks, and other domesticated birds — have a digestive system that differs fundamentally from mammals, and understanding these differences explains many of the practical feeding rules that otherwise seem arbitrary. Unlike ruminants that ferment fibrous material in a large fore-stomach, birds have a relatively simple, fast-transit digestive system that relies on mechanical grinding in the gizzard rather than microbial fermentation to break down feed.

The gizzard is a thick-walled, muscular organ that grinds food between ingested grit particles. This grinding action is the bird's equivalent of chewing — it breaks down whole grains, seeds, and fibrous material into particles small enough for enzymatic digestion to work efficiently in the small intestine. Without adequate grit, the gizzard cannot function properly and feed efficiency drops significantly. This is why providing insoluble grit (granite grit or similar hard stone particles — not oyster shell, which is soluble) to poultry that are not foraging on natural ground is essential rather than optional. Free-ranging birds on gravel or sand generally source their own grit, but housed or run-confined birds must have it provided.

The speed of the poultry digestive system — feed transit from ingestion to excretion in four to eight hours — means that nutritional deficiencies or excesses express themselves quickly in production and health. Egg production in particular responds rapidly to nutritional changes: a single day of inadequate calcium intake can reduce shell quality; several days of protein deficiency causes measurable production drops; and heat stress-induced reduction in feed intake causes production changes within 48 to 72 hours. This rapid responsiveness makes poultry nutrition both more demanding and more immediately rewarding to manage well than livestock species with slower-turnover production systems.

Water is technically the first and most important nutrient, not feed. A chicken deprived of water for 24 hours in mild conditions will show reduced production; the same bird deprived in summer heat will be in serious trouble within hours. Always ensure water is available before feed — a bird that goes to the feeder and then the drinker is fine; a bird that goes to the feeder and finds no water available will eat less, produce less, and stress more than one with ad libitum water access.

The commercial poultry feed market in Australia provides a range of complete formulated feeds designed for different species, ages, and production purposes. Understanding what these products contain and what they are designed to achieve allows keepers to make informed decisions rather than defaulting to whatever is on the shelf at the rural store.

Chick starter (typically 18 to 20% crude protein) is designed for the first eight weeks of life in chickens and the first three to four weeks in ducks. It provides the high protein needed for rapid early development. Medicated chick starter contains a coccidiostat — usually amprolium — that reduces the impact of coccidiosis during the high-risk early weeks when chicks are developing immunity. Unmedicated starter is appropriate where chicks have been vaccinated against coccidiosis or where the keeper prefers to avoid in-feed medication. Never feed medicated chick starter to ducklings — the coccidiostat included in many medicated chick starters can be toxic to waterfowl at the doses that are safe for chickens.

Grower pellets (15 to 17% crude protein) bridge the gap between starter and layer or finisher feeds, typically fed from eight weeks to point of lay or market weight. Protein is lower than starter because the rapid early development phase is complete, but still above the maintenance requirement to support ongoing growth. Grower feeds contain lower calcium than layer pellets — this is deliberate. High calcium in pre-lay pullets causes kidney damage; introducing layer pellets before birds begin laying is a management mistake with long-term health consequences. Keep pullets on grower feed until first eggs appear.

Layer pellets (15 to 17% protein, 3.5 to 4.5% calcium) are the complete feed for laying hens from point of lay onwards. The high calcium content supports the extraordinary calcium demand of eggshell production — a hen producing one egg per day deposits approximately two grams of calcium into each shell, a quantity that represents 10 to 15% of her total body calcium and must be replenished daily through diet. Feed a quality layer pellet as the primary diet, provide crushed oyster shell separately for hens that need additional calcium (high-rate layers, hens producing thin-shelled eggs), and provide insoluble grit on the side. Avoid feeding layer pellets to non-laying birds, roosters, or ducks as the high calcium is unnecessary and potentially damaging in animals without the calcium-binding physiology of the laying hen.

Meat bird feeds (broiler starter 22% protein for 0 to 3 weeks; broiler grower 18 to 20% for 3 to 6 weeks; broiler finisher 16 to 18% for 6 weeks to processing) are specifically formulated for the rapid growth of meat chickens. The protein profile and energy density of these feeds differ from layer feeds in ways that are commercially significant — a meat chicken fed a layer diet will grow significantly slower than one on a correct broiler ration, affecting both feed conversion efficiency and the weeks to market weight.

Duck feeds require specific consideration. Purpose-formulated waterfowl pellets are available but not universally stocked in rural stores. Where waterfowl pellets are unavailable, an unmedicated chick starter or grower feed is a suitable substitute for most stages of duck production, with the important provisos that it must be unmedicated (medicated poultry feeds are frequently unsafe for ducks) and that niacin supplementation may be needed — ducks have a higher niacin requirement than chickens and niacin deficiency causes leg problems in growing ducklings. Brewer's yeast added to the feed at approximately 2% of ration weight is the most practical niacin supplementation for duck keepers.

Water management in poultry is the area most likely to be underestimated by new keepers. The daily water requirement of a laying hen is approximately 200 to 350 millilitres in moderate conditions — double that in summer heat. A flock of twenty hens requires four to seven litres per day as a minimum, with requirements escalating sharply in heat. A flock that runs out of water mid-afternoon on a hot summer day will show measurable production impacts within 48 hours.

Drinker design matters enormously. Open bowls and troughs provide adequate water but are contaminated rapidly — chickens stand in them, defecate in them, and introduce feed and litter material that creates a bacteria-rich soup within hours. Nipple drinkers or cup drinkers that deliver water on demand eliminate contamination from bird contact, dramatically reduce drinker-cleaning frequency, and maintain water quality through the day. For the small-scale keeper managing household flocks of ten to fifty birds, investing in a nipple or cup drinker system pays immediate dividends in reduced management time and improved flock health. Ducks are an exception — they cannot use nipple drinkers effectively and need open water access, but the water should be positioned so that they can submerge their bills without being able to stand in the trough and contaminate it with their feet.

In summer, refresh water in the morning and again in the afternoon to ensure cool water is available during peak heat hours. Add ice to drinkers during extreme heat events — birds will preferentially drink cool water, and ice slows the warming of the water supply through the hottest part of the day. Where a mains-connected automatic drinker system is not practical, install enough drinker capacity that the flock cannot empty it mid-morning and be without water through the afternoon.

Water quality testing is rarely done by small-scale poultry keepers but can explain persistent production problems or flock health issues where no other cause is apparent. High iron in bore or dam water causes an oxidised, metallic taste that birds find aversive and reduces voluntary intake. Elevated bacteria counts in dam water cause increased diarrhoea and gastrointestinal disease incidence. High salinity (above 3,000 mg/L TDS) in bore water reduces palatability and can cause kidney stress in laying hens over time. If a flock is consistently underperforming relative to expectations and management appears sound, commissioning a basic water quality test through an agricultural laboratory is a worthwhile investment.

Scratch grains — a mix of whole or cracked cereal grains typically including wheat, corn, and occasionally oats or sorghum — have a place in poultry management but must be understood correctly. Scratch is not a complete feed, it is a supplement. Scratch grains are high in energy and low in protein, calcium, and most essential vitamins and minerals. A hen that fills up on scratch before accessing her layer pellets will consistently under-consume protein and calcium, leading to reduced egg production, thinner shells, and eventually health problems from sustained nutritional deficiency.

The correct way to use scratch is as a small supplement delivered in the afternoon after birds have eaten their main ration. Scatter it across the run or foraging area — the scratching behaviour it stimulates provides environmental enrichment and encourages natural foraging movements. Quantity: no more than 10 to 15% of total diet by weight, which translates to approximately 15 to 20 grams per hen per day. In summer, reduce or eliminate scratch — its high carbohydrate content increases metabolic heat generation, which is counterproductive when heat stress is already a welfare concern. In winter in southern Australia, a small scratch allowance before roosting provides some additional thermogenic capacity.

Foraging on quality pasture is the most nutritionally complete supplement a poultry keeper can provide. Free-ranging hens on actively growing pasture consume significant quantities of green material, insects, and soil microorganisms that collectively improve egg yolk colour and flavour, provide protein and micronutrients, and support immune function in ways that no commercial supplement fully replicates. The deep orange-yellow yolk that characterises eggs from genuinely free-ranging hens is the visual signature of xanthophylls (yellow pigments) from green plant material — the same compound that turns the flesh of pastured meat birds a slightly more golden colour than confinement-raised birds. If genuine ranging on quality pasture is available, it reduces the need for supplementation and improves product quality simultaneously.

Kitchen scraps have a complicated role in Australian poultry keeping. Current Australian biosecurity legislation prohibits feeding "swill" — food scraps that contain or have been in contact with meat or meat products — to poultry. This restriction exists because of the risk of introducing exotic disease through meat products, including African swine fever, foot-and-mouth disease, and Newcastle disease. Vegetable scraps, fruit peels, cooked grains, and similar plant-based kitchen material are acceptable in most jurisdictions, but check the specific requirements of your state — the rules vary and penalties for non-compliance can be significant. Never feed raw or cooked poultry products back to poultry.

Black soldier fly larvae (BSFL) have become one of the most popular and genuinely useful poultry supplements in Australia over the past decade, driven by their commercial availability in dried form and their exceptional nutritional profile. Dried BSFL contain 35 to 45% protein and 25 to 35% fat, with a calcium-to-phosphorus ratio that is well-suited to supplementing laying hens. They are highly palatable — chickens and ducks consume them enthusiastically — and can be used to boost protein intake during moult, in late winter when pasture quality is low, or as a high-value treat that also provides enrichment through natural foraging behaviour. Mealworms, crickets, and other insect protein sources provide similar benefits but are typically more expensive per gram of protein than BSFL.

Calcium management is one of the most practically important and most frequently mismanaged aspects of layer nutrition in small-scale poultry keeping. A laying hen's calcium requirement during active production is extraordinary relative to her body size — she deposits approximately 2 grams of calcium into each eggshell, and the skeletal calcium reservoir that buffers this demand has limited capacity. Sustained inadequate calcium intake results in thin, soft, or absent eggshells; eggs laid without shells on the floor of the coop; skeletal calcium depletion that eventually causes bones to fracture; and ultimately a complete collapse of production as the hen's physiology is unable to sustain the process.

A quality layer pellet provides adequate calcium for most hens in most conditions. The complication arises when feed intake drops — in heat stress, during illness, after a fright or disruption event, or in hens that are not consuming their full feed ration for any reason. A hen eating 80% of her normal ration is consuming only 80% of her calcium intake, while her calcium demand from laying remains unchanged. The shortfall is drawn from bone, and over days to weeks this creates the skeletal calcium depletion problems described above.

Crushed oyster shell or limestone grit provided separately — not mixed into the main feed — allows hens to self-regulate their calcium intake. Hens are surprisingly capable of adjusting their oyster shell consumption to their current calcium needs, consuming more when laying rate is high and less when production is lower. This self-regulation is more precise than any fixed supplementation rate, which is why providing oyster shell separately (rather than relying solely on the layer pellet formulation) is the standard recommendation for all laying flocks. Place oyster shell in a separate container accessible at all times; it does not need to be rationed or managed — hens will consume what they need and ignore the rest.

Thin-shelled eggs, consistently soft-shelled eggs, or shells with ridges and surface irregularities that appear suddenly in a previously normal-shelled flock indicate a problem. Possible causes beyond calcium deficiency include: vitamin D deficiency (vitamin D is required for calcium absorption; birds with inadequate access to natural sunlight or vitamin D supplementation cannot absorb dietary calcium efficiently); infectious bronchitis (a common respiratory virus in Australia that damages the shell gland — call your vet if respiratory signs accompany shell quality changes); heat stress (high temperature disrupts the carbonic anhydrase enzyme system used in shell formation); and advancing age (shell quality declines in older hens as the shell gland becomes less efficient). Diagnosis requires ruling out nutritional causes first — review feed, water, and oyster shell access before investigating disease causes.

A common management mistake in small-scale poultry keeping is feeding all birds in the same pen the same feed regardless of their age, sex, or production status. A rooster fed layer pellets receives unnecessarily high calcium that stresses his kidneys over time; a growing pullet fed layer pellets before she begins laying receives the same; ducklings fed medicated chick starter receive a potentially toxic medication dose. Managing feed type by bird class — even in a small flock — improves health outcomes and reduces the long-term costs of nutrition-related health problems.

Chicks (0 to 8 weeks): chick starter appropriate for species, medicated or unmedicated as appropriate. Provide water that is shallow enough to prevent drowning — marbles or clean pebbles in a shallow dish work for the first week; purpose-designed chick drinkers thereafter. Provide chick-sized insoluble grit from week one if feeding anything other than commercial starter.

Growing pullets (8 weeks to first egg): grower pellets, transitioning to layer pellets only when first eggs appear. Maintain access to grower and layer pellets simultaneously during the transition week to ease the change. Start offering oyster shell separately as pullets approach point of lay (around 16 to 20 weeks for most breeds).

Laying hens: layer pellets ad libitum as the primary feed; oyster shell separately; insoluble grit available; clean water always available. Scratch as described above, no more than 15% of total intake. Forage access on quality pasture is the most productive supplement.

Meat birds: broiler ration appropriate to growth stage, fed ad libitum. Meat birds — particularly Cobb 500 and Ross 308 type commercial broilers — have been selected for such rapid growth that restricting feed access compromises welfare. Provide adequate drinker and feeder space that all birds can access simultaneously without competition.

Roosters: if roosters are kept with the laying flock and cannot be fed separately, use a lower-calcium complete feed (an all-flock or grower pellet) as the main feed and provide oyster shell separately for hens to access as needed. In small flocks where all birds are fed together, the compromise of an all-flock feed with separate oyster shell is the most practical management solution.

Ducks: unmedicated waterfowl pellet as preferred, or unmedicated chick starter or grower. Supplement niacin if using chicken feed. Always ensure water is available simultaneously with feed — ducks physically cannot swallow dry pellets without water, and attempting to do so causes choking and can damage the bill and oesophagus. Ducks in active laying have similar calcium demands to chickens and benefit from oyster shell provision.