Large ship for transporting livestock
A livestock carrier is a seagoing vessel for the transportation of live animals. Typically it is large ship used in the live export of sheep, cattle and goats. Livestock carriers may be specially built new or converted from container ships.
Livestock carriers.
Livestock carriers are those ships which specialise exclusively in the transportation of large numbers of live animals together with their requirements for the voyage. (food, water, sawdust bedding, medication, etc.).
Voyages on livestock carriers generally last from three days to three or four weeks. Some have lasted for months when disease outbreaks are suspected.
In practice, natural ventilation alone isn't adequate for all situations. One obvious limiting factor would be in following wind conditions at sea, when the air moves at the same speed as the ship. In that condition the natural air flow ventilating the animal pens can be insufficient. On most open livestock carriers there is also some type of supplementary mechanical ventilation installed in critical zones, along with appropriate back-up equipment for emergencies.
Types of animals transported.
Various species have been transported in this way, but by far the most numerous are the domesticated breeds of sheep and cattle. During the latter half of the twentieth century, millions of sheep and many thousands of cattle were transported on livestock carriers. Other domesticated species which have been transported, though in smaller numbers, include horses, camels, deer, goats and, on at least one occasion, ostriches.
The transportation of live fish, on small specialised vessels, is a similar trade which has developed in the early 21st century in association with fish farming. 
Regulation.
National authorities, which permit the export or import of live animals, regulate and monitor the ships and the associated aspects of the trade very closely, in particular to minimise the likelihood of introducing infectious disease.
In April 2024, the livestock carrier "Sarah M" was banned from entry to Ireland after recently being registered with the Russian Maritime Register of Shipping. As a result of this it was subject to European Union sanctions. Subsequently it was reported to be off southern Europe, in the Mediterranean, awaiting orders.
Sizes and capacities.
This type of ship exists in a variety of sizes, depending on market demands in different parts of the world at different times. In the latter half of the twentieth century, the prime route for such vessels was from Australasia to the Middle East. The principal livestock exporting nations were Australia and New Zealand, with the main importers being nations in the Middle East. Vessels engaged in that trade have covered a broad range of sizes, from  tonnes deadweight (DWT) to  DWT. 
The limiting factors on ship size are complex. Bigger vessels can achieve economies of scale in their operations but also require more extensive port facilities to handle the larger numbers of livestock likely to be loaded or discharged.
Typically, livestock carriers carry more crew members than conventional cargo ships of a similar size, with experienced stockmen an essential part of the crew. The total number of stockmen required depends on the number of animals and also factors such as the arrangement of the livestock pens and the extent of automated systems installed for feeding and watering.
During the last three decades of the twentieth century, there was a progressive trend towards large vessels carrying greater numbers of animals in pursuit of economies of scale. Prior to that, a significant limitation had been fresh water storage capacity on ships; to maintain condition, average-sized cattle require at least forty litres of water per head, per day, with sheep requiring less- at least four litres per head, per day. Developments in water production technology (salt water evaporators or reverse-osmosis systems) have led to livestock carriers with equipment capable of producing up to 600 tonnes (600,000 litres) of fresh water per day. 
Sheep and cattle also require fodder amounting to at least 2% of their body weight per day. Livestock carriers are required to carry sufficient feedstuffs for the maximum length of the voyage, as well as adequate reserves for emergencies.
Medium-sized vessels with capacity for about 30,000 to 40,000 sheep (or 3000 to 4000 head of cattle) are a common size for this type of ship. However, during the last two decades of the twentieth century, there were a small number of sheep carriers which had capacity for 130,000 sheep. 
There were at least two other large livestock carriers which specialised in combined cargoes of cattle and sheep. One had capacity for about 7,000 cattle and 70,000 sheep and the other could carry 14,000 cattle and 20,000 sheep.
In 2007 the livestock carrier "Deneb Prima" was loading cargoes amounting to 20,000 cattle and 2000 sheep.
The numbers detailed above are only general indications. The space allocated to animals on livestock carriers is officially regulated according to their size and weight ranges. Larger and heavier animals are allocated proportionately more space per head.
Safety record.
The loss of a ship in the Indian Ocean in 1996 resulted in the deaths of 67,488 sheep. This provoked animal welfare organisations including 
CIWF to campaign against the livestock trade.
The "DANNY F II" capsized in the Mediterranean Sea in December 2009 resulting in the loss of many crew members and more than 20,000 animals.
Fire broke out onboard livestock carrier "Estancia" (IMO 7404944) anchored off Berbera, in the Gulf of Aden, in August 2013.
In May 2015, the "Asia Raya" caught fire with 634 cows on board, originally destined for East Kalimantan in Indonesia; many of the cattle lost their lives.
On 12 July 2015, a livestock carrier sunk in the Gulf of Aden, with the death of all the animals onboard and two crew.
Livestock carrier losses in 2015 included the "Haidar", in Barcarena, Brazil, in October, carrying 5,000 cattle (an unknown number drowned, and only few survived). Also in the autumn of 2015 the "Nabolsi I" caught fire in the Mediterranean Sea off Ierapetra, Crete while en route from Beirut to Alexandria. 
In January 2019, the "Wardeh" was involved in an incident when it ran aground in the Mediterranean Sea near Mersin, Turkey.
In November 2019, the livestock carrier "Queen Hind" capsized and sank in the Port of Midia, Romania, with 14,000 sheep onboard.
On 2 September 2020, some 6,000 cattle and 41 crew died during the loss of the "Gulf Livestock 1" in the East China Sea. Two crew members survived.
In October 2020, livestock carriers were assessed as being twice as likely to be declared an accidental economic loss as other types of cargo vessel. 
On 12 June 2022, some 15,000 sheep drowned in the sinking of the "Badr 1" in the Red Sea port of Suakin, Sudan.
References.
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