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On long sea voyages, livestock are cared for through a planned combination of species-appropriate feed and water, ventilation suited to changing conditions, regular observation, and emergency procedures. The details depend on the animals, ship, route, weather, and applicable law: there is no single feeding interval, water allowance, ventilation rate, or maximum voyage length that applies to every voyage.
Why care at sea has to be planned as a system
Keeping livestock well on a ship involves more than carrying enough feed and water. Supplies must remain usable, animals must be able to reach them, air movement must continue in changing conditions, and the crew needs a way to detect and respond to problems. The World Organisation for Animal Health (WOAH) identifies planning as a key factor in animal welfare during a journey. Its Terrestrial Animal Health Code, Chapter 7.2, gives international guidance for transport by sea; it is guidance, not a replacement for the law that applies to a particular voyage.
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Planning connects the animal’s needs to the ship’s layout and the expected journey. A plan needs to account for the species, animals’ size and condition, the feed and water they will receive, the way those supplies will be delivered, the available airflow, and the crew’s ability to inspect animals and equipment. It also needs to address what happens if conditions or machinery change.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11WOAH’s central point is concise: “Adequate planning is a key factor affecting the welfare of animals during a journey.” For a shipboard plan, that means considering provisions, vessel design, loading arrangement, climate, and emergency response together rather than treating each as an isolated task. The relevant comparison is not between one supposedly ideal feeder or ventilation system and another; it is whether the chosen arrangement suits the animals and works under the conditions expected on that vessel.
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How livestock receive feed and water
Access must suit the animals
WOAH guidance calls for animals to have adequate access to feed and water appropriate to their species, size, and weight. It does not prescribe one feeder or trough arrangement for all livestock. The shipboard method has to work for the animals being carried and allow them to reach supplies. Arrangements should also minimize soiling of feed and water and avoid making animals’ access dependent on a system that is unsuitable for their type or size.
The layout matters as much as the supply itself. On multi-level vessels, waste from animals above should not contaminate animals, feed, or water below. That makes separation and protection part of the feeding and watering plan, rather than a matter to consider only after contamination occurs. A plan should therefore be assessed for both access at the point of use and how the ship’s arrangement protects resources on lower decks.
Supplies need protection during the voyage
Feed and bedding must be stowed so they are protected from fire hazards, weather, and seawater. The purpose is practical as well as logistical: a supply that has been spoiled, contaminated, or made inaccessible cannot meet the animals’ needs. Provisioning must therefore consider where supplies are stored and how they can be kept protected and available as the voyage progresses.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Storage is one part of provisioning, not a substitute for planning the amount and availability of supplies. Before departure, the voyage plan needs to connect the expected journey with the feed and water that will be available to the animals. It should also account for the vessel and route conditions that may affect the journey. The standards do not provide a single universal ration or water quantity for every species, so a number taken out of context would not describe what every ship needs.
Match the feed and delivery method to the animals
The pre-voyage plan should consider how much feed and water will be needed over the journey, as well as whether the feed’s quality and composition suit the animals’ species, age, and condition. Familiarity is relevant, too. WOAH says animals should be preconditioned when they will encounter a new diet or an unfamiliar method of receiving feed or water. In practical terms, the animals need preparation for the change rather than first encountering it after departure.
Preconditioning applies to the feeding or watering method as well as to a new diet. This is why the question is not only how much feed and water are aboard, but whether the planned supplies and delivery arrangement are appropriate for the particular animals. The plan should take account of the animals’ condition and experience, and of how they will access what is provided during the journey.
These requirements explain why a generic allowance is not enough to describe provisions for every ship. The planned supplies and access arrangements have to fit the animals and the journey. The guidance summarized here does not establish a universal feed quantity, water quantity, or interval between feedings and watering for all species and conditions.
How ventilation protects livestock during a voyage
Airflow must work as conditions change
Ventilation is an active part of animal care because it must meet animals’ thermoregulatory needs as the climate varies. A system that works in one operating condition may not be sufficient in another. WOAH guidance says ventilation needs to function while the vessel is stationary, not only while it is moving, and to have emergency power available if primary machinery breaks down.
This means a voyage plan needs to consider the ventilation system’s operation across the conditions the ship may encounter, including a stop and a failure of primary machinery. Equipment expectations alone do not guarantee that animals will remain comfortable or healthy; observation and a plan for responding to problems remain essential.
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When evaluating the arrangement, the key questions are whether ventilation can meet the animals’ needs as climate changes, whether it continues when the vessel is stationary, and whether backup power is available if primary machinery fails. Those are different operating circumstances, and a plan that considers only normal movement at sea would leave out conditions specifically addressed in WOAH guidance.
Enclosed decks can need forced airflow
Natural airflow may be restricted on enclosed decks. The problem can be especially relevant on roll-on/roll-off vessels when animals are transported inside a secondary vehicle or container. WOAH notes that forced ventilation may be needed in these circumstances and may need greater capacity than natural ventilation provides.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsThe important distinction is not simply “natural” versus “mechanical” ventilation. It is whether the airflow available in the actual space can meet the animals’ needs, including when the ship is stopped or ordinary machinery is unavailable. Enclosure and the arrangement of vehicles or containers can change what airflow is possible, so the ventilation plan has to reflect the ship and loading configuration.
In other words, a system suitable for a more open space cannot automatically be assumed to work in an enclosed deck or inside a vehicle or container. The relevant factors are the space, the way animals are positioned, and the airflow the system can provide in the operating conditions. WOAH’s guidance is about capacity and function in context, not a single ventilation rate that applies to every vessel.
How crews monitor animals and ship systems
Observation and daily records
Animals should be positioned so they can be observed clearly and regularly. WOAH guidance also calls for a daily journey log. The log covers inspections and important events, including food and water consumed, climatic conditions, illness and deaths, medication, and mechanical defects.
These records help connect animal condition to the conditions and systems on board. For example, consumption, climate, health events, and equipment problems are all relevant to understanding how the journey is progressing. Recording them does not itself resolve a problem; it supports timely detection and gives the crew information to use when deciding what response is needed.
Observation and logging are complementary: animals need to be positioned for clear, regular checks, while the log preserves a daily record of inspections and changes. It can capture both animal-related events, such as illness, death, or medication, and operational information, such as climate, consumption, and mechanical defects. That makes it possible to review more than whether supplies were loaded; it records what happened as the voyage unfolded.
Emergency arrangements
An emergency plan should identify adverse events, the steps to take, who is responsible, how people will communicate, and how actions will be recorded. The plan is part of the care system because animals depend on functioning supplies and environmental controls over a long voyage. A response that has not been assigned or communicated may be harder to carry out when an equipment failure or another adverse event occurs.
WOAH’s guidance ties emergency planning to practical responsibilities, communications, and records. It should therefore be specific enough for the people on board to know what to do and how to report what happened, rather than treating “have an emergency plan” as a sufficient procedure by itself. The emergency plan and daily log have related but distinct roles: one sets out the response in advance; the other records inspections, conditions, and events during the journey.
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Why voyage duration and care intervals vary
There is no one voyage duration or care interval that can safely be applied across all livestock sea transport. WOAH says duration decisions should take account of animal vulnerability and experience, fatigue, need for care, need for feed and water, injury and disease risks, available space, weather, vessel type, and sea conditions. These factors can differ substantially between species and journeys.
For that reason, guidance about planning should not be converted into a universal number of hours between watering, a single ventilation rate, a global maximum voyage length, or a fixed feed allowance. The applicable legal requirements may set specific intervals or conditions, but those depend on jurisdiction and species. A voyage’s plan must be assessed against the rules that actually govern it.
Duration is therefore a decision connected to welfare and operating circumstances, not just a timetable. Animal vulnerability and experience, fatigue, care needs, risks of injury or disease, available space, weather, vessel type, and sea conditions all matter under WOAH guidance. Comparing two journeys requires considering those factors rather than assuming that the same length or interval is appropriate for both.
What EU rules add for livestock vessels
The European Commission’s overview of animal welfare during transport describes Regulation (EC) No 1/2005 as part of the current EU framework. EU rules address duties and minimum conditions such as feeding and watering intervals, rest periods, journey times, personnel competence, fitness to travel, and space. These legal requirements are distinct from WOAH’s international guidance and apply in their relevant jurisdiction.
The Commission also describes sea-specific measures adopted in 2023 for EU livestock vessels. They provide for an electronic database of inspection results, a veterinarian on a vessel’s first journey, nearby port control posts where animals can rest, and enhanced checks involving veterinarians and maritime engineers. These are EU measures, not a universal description of requirements for every country or ship.
As of the Commission page consulted on 10 October 2026, the broader revision of EU transport rules proposed in December 2023 remained under examination by the European Parliament and Council. That status is separate from the existing framework and the sea-specific measures already adopted in 2023.
For a voyage subject to EU rules, the Commission’s overview is a starting point for distinguishing the current framework from the newer sea-specific measures and from the broader proposal still being examined. Outside the EU, the applicable national or regional requirements need to be checked; WOAH guidance alone does not specify every legal interval or condition that will apply.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What good planning can—and cannot—guarantee
Standards describe the planning, equipment, access, monitoring, and emergency arrangements expected for animal transport; they do not guarantee a particular outcome on every voyage. Supplies can be planned and systems provided, but crews still need to observe animals, track conditions, record consumption and events, and respond to failures or adverse changes.
When considering a particular voyage, the useful questions are whether the arrangements fit the animals and the ship, whether feed and water remain accessible and protected, whether airflow works in the actual spaces and during stationary or emergency conditions, whether animals can be regularly observed, and whether the crew has a clear response plan. Applicable local or regional law must also be checked separately, because international guidance alone does not establish every legal requirement.
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A practical review can follow the same chain: identify the species and condition of the animals; check whether feed and water access, quality, and storage fit them; consider whether a new diet or delivery method requires preconditioning; assess ventilation in the actual spaces, including when stationary and if primary machinery fails; and confirm that observation, logs, and emergency responsibilities are in place. This is a way to test whether the plan covers the relevant questions, not a guarantee that every voyage will have the same outcome.
Frequently Asked Questions
Are there universal feed and water amounts or intervals for livestock at sea?
No. WOAH guidance says provisions and access should suit species, size, weight, age, and condition, but it does not establish one quantity or interval for every livestock voyage. Specific legal requirements depend on the jurisdiction and species.
Why might animals need preconditioning before a sea voyage?
WOAH says animals should be preconditioned if they will encounter a new diet or an unfamiliar way of receiving feed or water. The aim is to prepare them for the diet or delivery method before they meet it during the voyage.
What does the crew record during a voyage?
WOAH calls for a daily journey log covering inspections and important events, including food and water consumed, climatic conditions, illness or deaths, medication, and mechanical defects.
Does natural ventilation always work on a livestock vessel?
Not necessarily. Enclosed decks can restrict natural airflow, particularly when animals travel inside a secondary vehicle or container on a roll-on/roll-off vessel. WOAH says forced ventilation may be needed and may require greater capacity than natural ventilation provides.
What happens if a ship stops or its primary machinery fails?
WOAH guidance says ventilation should continue while the vessel is stationary and have emergency power available if primary machinery breaks down. The vessel’s emergency plan should also set out adverse events, response steps, responsibilities, communications, and recordkeeping.
Are WOAH guidance and EU transport rules the same thing?
No. WOAH’s Terrestrial Animal Health Code provides international guidance. The European Commission describes EU legal duties and minimum conditions, including feed and water intervals, rest periods, journey times, personnel competence, fitness to travel, and space. Those legal rules apply in their relevant jurisdiction.
The Bottom Line
Livestock are kept fed, watered, and ventilated at sea through plans that match supplies, access, airflow, monitoring, and emergency response to the species, vessel, and voyage. WOAH guidance calls for protected, accessible provisions; ventilation that works while stationary and has emergency backup power; regular observation and daily records; and planning that accounts for animal condition, weather, vessel type, and sea conditions. Exact requirements vary by species and jurisdiction, so there is no single universal allowance or interval.
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