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On long sea voyages, livestock are kept fed, watered and ventilated through a coordinated plan for supplies, delivery systems, airflow, observation and emergencies. The plan must suit the animals and the vessel: species, size, age and condition affect what animals need, while weather, sea conditions, voyage length and ship design affect what the crew must provide. The World Organisation for Animal Health (WOAH) sets out international guidance for these arrangements; applicable legal requirements vary by jurisdiction.
What the shipboard care plan covers
A livestock voyage is not simply a matter of loading enough feed and water before departure. The vessel and its crew need a plan for making suitable feed and water accessible throughout the journey, maintaining an appropriate environment, noticing problems, and responding when equipment or animal health fails. WOAH’s Terrestrial Animal Health Code, Chapter 7.2, describes planning as central to animal welfare during transport by sea. Its recommendations address vessel design and operation as well as the day-to-day care of animals.
The details depend on the animals being transported. A plan should take account of species, size, weight, age and condition, and whether animals are familiar with the diet and the way feed and water will be delivered. The ship’s layout matters too: enclosed decks, vehicle or container transport, and the possibility that a vessel may be stationary all affect how supplies and airflow need to work. There is no single feeder, trough, ventilation setting or voyage schedule that applies to every livestock shipment.
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In practical terms, the plan has to connect several decisions rather than treat them as separate checklist items. The quantity and quality of provisions matter, but so do safe stowage, access in the animals’ pens, deck layout, ventilation during a stoppage and the crew’s ability to inspect animals. A weakness in one part can undermine another: for example, provisions can be available aboard but inaccessible or contaminated, while an airflow system can be installed but still require monitoring and a contingency if primary machinery fails.
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How feed and water are supplied
Plan supplies for the animals and the journey
Before departure, the voyage plan should account for how much feed and water will be needed over the expected journey and how animals will access them. WOAH guidance calls for adequate access suited to species, size and weight, with arrangements that minimize soiling. This means the plan needs to consider both the supplies themselves and the way they are made available to animals aboard that particular vessel.
Feed quality and composition should be appropriate to the animals’ species, age and condition. Animals may need to be preconditioned if they are to receive a new diet or use an unfamiliar feed or water delivery method. Preparing them in advance can make the transition less abrupt; it does not change the need to ensure suitable supplies remain accessible during the voyage.
That preparation is particularly relevant when the onboard routine differs from what animals know before loading. A new feed or unfamiliar delivery arrangement should not simply be assumed to work because it is present on the ship. Preconditioning gives animals a chance to become accustomed to it before the journey, while the plan still needs to match provisions to the expected voyage and the animals’ condition. The guidance supports this tailored approach, not a universal ration or watering interval.
Protect supplies from contamination and damage
Feed and bedding need safe stowage that protects them from fire hazards, weather and seawater. Vessel design and loading arrangements should also prevent waste falling from upper levels from contaminating animals, feed or water below. These protections matter because a supply plan is only useful if provisions stay fit for use and feeding and watering areas remain suitably clean.
Feed and water arrangements are therefore linked to how animals are penned and how decks are used. Access must be appropriate without creating avoidable soiling, and waste from one level must not compromise provisions or animals on another. The guidance establishes these design and access principles, but it does not give one universal feed quantity, water allowance, or interval for every species and voyage.
How ventilation protects animals at sea
Airflow must suit changing conditions
Ventilation is an active part of animal care, not merely a feature of the ship. It needs to support the animals’ thermoregulatory needs as climate conditions change. The WOAH guidance also calls for ventilation to continue when the vessel is stationary, rather than relying on the assumption that the ship will always be moving.
A plan must consider the particular spaces where animals are carried. Enclosed decks can restrict natural airflow, and livestock carried inside a secondary vehicle or container on a roll-on/roll-off vessel may face further limits on air movement. In such circumstances, forced ventilation may need greater capacity than natural ventilation can provide. The required arrangement depends on vessel configuration and the conditions animals will encounter; the cited guidance does not establish a single airflow rate for all ships.
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This makes vessel configuration an important comparison when evaluating voyage plans. An open or naturally ventilated space and an enclosed deck do not present identical airflow conditions; a vehicle or container within a roll-on/roll-off vessel can add another barrier to natural movement of air. The practical question is whether the system can meet the animals’ needs in the actual space and across changing climate conditions, not whether a vessel has ventilation equipment in the abstract.
Plan for a loss of primary machinery
Because animals need airflow even if the vessel’s primary machinery breaks down, WOAH calls for emergency power for ventilation. This is a contingency requirement as well as a design consideration: it addresses the possibility that the normal power source or machinery may not be available when ventilation is still needed. Equipment expectations do not guarantee that conditions will remain suitable, so the crew’s checks and response plan remain important.
What crews monitor during the voyage
Observe animals regularly
Animals should be positioned so they can be observed clearly and regularly. Observation gives the crew a way to notice health or welfare concerns and to identify when an animal needs attention. Positioning, access and the ability to inspect animals are therefore part of voyage planning, not details to consider only after a problem appears.
Keep a daily journey log
WOAH guidance calls for a daily journey log that includes inspections and important events. The record covers food and water consumed, climatic conditions, illness and deaths, medication, and mechanical defects, as well as inspection and event details. Keeping these items together can help the crew track animal condition alongside the environment and equipment on which care depends.
The log also makes failures and changes visible as they happen: a mechanical defect belongs in the record alongside animal-health events and consumption. A record does not replace action, but it supports monitoring and helps document what has occurred during the journey. In combination, observations and records give the crew information about both the animals and the systems intended to support them; an entry about a problem is not a substitute for responding to it.
How journey length and risk are assessed
There is no universal maximum voyage duration or one global schedule for feeding and watering established by the cited WOAH guidance. Decisions about journey duration need to account for several factors, including:
- Animal vulnerability, experience and fatigue.
- The animals’ need for care, feed and water.
- Risks of injury and disease.
- Available space.
- Weather and sea conditions.
- Vessel type and the conditions it creates for the animals.
These considerations explain why a schedule suitable for one shipment cannot safely be assumed to suit another. Species and animal condition affect care needs, while the ship, voyage and sea conditions affect what can be delivered and monitored. Specific intervals and other legal limits depend on the jurisdiction and species involved.
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Journey length is therefore considered alongside the likely demands of the trip, not in isolation. A vulnerable or fatigued group, a need for additional care, limited space, adverse weather or the characteristics of a particular vessel can all affect the assessment. The guidance does not turn those factors into a single formula for a maximum duration. Nor should a general voyage plan be mistaken for a species-specific legal schedule.
What happens when conditions or equipment deteriorate
An emergency plan should identify potential adverse events, the steps to take in response, who is responsible, how communications will work, and what records must be kept. This connects the plan to the systems that sustain animals: a ventilation or other mechanical problem, for example, needs to be recognized and handled under assigned responsibilities rather than treated as an isolated maintenance issue.
Regular observation and the journey log support that response by documenting animal condition, climate, consumption, medication, deaths or illness, and equipment defects. Together, these practices help a crew detect and respond to problems. They cannot guarantee good outcomes, and equipment specifications alone do not establish that animals are receiving suitable care on a particular voyage.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How international guidance differs from legal requirements
WOAH’s Terrestrial Animal Health Code provides international animal-health and welfare guidance; it is not a substitute for the law that applies to a specific voyage. Governments may set binding rules that differ by region, species or circumstance, so operators need to identify the applicable requirements rather than treat an international standard as a universal legal schedule.
In the European Union, the European Commission identifies Regulation (EC) No 1/2005 as part of the current framework for animal transport. EU rules address matters including feeding and watering intervals, rest periods, journey times, personnel competence, fitness to travel and space. These requirements are jurisdiction-specific and sit alongside the practical need to plan supplies, airflow, observation and emergency arrangements for the ship and animals involved.
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The Commission describes sea-specific measures adopted in 2023. They provide for an electronic database of inspection results, a veterinarian aboard 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; they should not be presented as requirements that automatically apply to voyages elsewhere.
The Commission’s overview, consulted on 10 October 2026, says the broader revision of EU animal-transport rules proposed in December 2023 remains under examination by the European Parliament and Council. That proposal’s status is distinct from the current framework and the sea-specific measures already adopted in 2023.
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What a well-planned voyage brings together
Effective care depends on the fit between animals, supplies, vessel and voyage. The feed and water plan needs suitable provisions and accessible delivery; ship design and stowage need to protect animals and supplies from contamination; ventilation needs to work across changing conditions, including when the vessel is stationary, with emergency power available for a breakdown of primary machinery. Regular inspection, complete daily records and an emergency plan help crews respond to changing conditions.
The operational details cannot be reduced to one global number or equipment recipe. WOAH guidance provides the broad planning and welfare principles, while applicable law supplies region- and species-specific obligations. The crew must apply both to the animals, vessel and conditions of the actual voyage.
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Frequently Asked Questions
Do all livestock need the same feed and water arrangements at sea?
No. Access should suit the animals’ species, size and weight, and feed quality and composition should suit their species, age and condition. The voyage plan also needs to account for how much feed and water will be needed and whether animals are familiar with the diet and delivery method.
Does WOAH set one universal feed, water or ventilation rate for sea voyages?
No. WOAH guidance emphasizes planning for the animals, vessel and journey rather than one global rate or schedule. Applicable legal intervals and other requirements depend on jurisdiction and species.
What happens if animals are unfamiliar with the onboard feed or delivery system?
WOAH says animals should be preconditioned when they will encounter a new diet or unfamiliar feed or water delivery method. Provisions still need to remain suitable and accessible throughout the voyage.
Why does a ship need backup power for ventilation?
Ventilation must support animals’ thermoregulatory needs, including when a vessel is stationary. Emergency power is intended to keep ventilation available if primary machinery breaks down; regular observation and contingency planning remain necessary.
What does the crew record during a livestock voyage?
The daily journey log includes inspections and important events, food and water consumed, climatic conditions, illness or deaths, medication and mechanical defects. An emergency plan also identifies response steps, responsibilities, communications and recordkeeping.
Are the EU livestock-vessel rules universal?
No. EU requirements apply within their jurisdiction. The European Commission identifies current framework duties and sea-specific measures adopted in 2023, while WOAH’s code provides international guidance rather than replacing national or regional law.
The Bottom Line
Livestock are kept fed, watered and ventilated at sea through a voyage-specific system: suitable provisions and access, protected stowage, airflow that works in changing conditions and during a stoppage, regular observation, daily records and clear emergency responsibilities. The details depend on the species, vessel, journey and applicable law; no single global rate or equipment recipe fits every voyage.
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