When I was on a voyage to the Middle East I was told about these ships. Animals die enroute and are tossed overboard. Sharks feed on the carcasses.
For some years the port of Eastport, Maine shipped pregnant cows to Turkey. Concered with Mad Cow disease, the EU blocked the export of meat products from the US to members of the EU. However, pregnant cows could be shipped to Turkey and give birth; the calves were fattened and exported to Europe.