The symptoms of vitamin deficiency diseases in livestock includes the following ...

Livestock, such as cows, goats, and chickens, need a balanced diet to stay healthy, just like humans do. One important part of their diet is vitamins, which are nutrients that help the body function properly.

The question is asking about the symptoms of vitamin deficiency diseases in livestock. This means that if the animals don't get enough of certain vitamins, they can become sick and show specific signs of illness.

Let's look at the options given.

Option A is scurvy. Scurvy is a disease caused by a lack of vitamin C. Humans can get scurvy if they don't eat enough fruits and vegetables that contain vitamin C, like oranges and strawberries. However, livestock don't usually get scurvy because they can produce their own vitamin C in their bodies. So, option A is a symptom of vitamin deficiency diseases in humans, but not in livestock.

Option B is loss of appetite. When animals have a vitamin deficiency, they may not feel hungry and not want to eat. This can lead to weight loss and other health problems. So, loss of appetite can be a symptom of vitamin deficiency diseases in livestock.

Option C is poor blood clotting. Some vitamins, like vitamin K, help the blood to clot properly. If an animal doesn't have enough of this vitamin, they may bleed more easily and have trouble stopping bleeding. So, poor blood clotting can be a symptom of vitamin deficiency diseases in livestock.

Option D is improved fertility. Fertility refers to the ability to reproduce and have babies. This option is actually the correct answer to the question. Vitamin deficiencies can actually reduce fertility in livestock, making it harder for them to have babies. So, improved fertility is not a symptom of vitamin deficiency diseases in livestock.

Option E is rickets. Rickets is a bone disease caused by a lack of vitamin D, which helps the body absorb calcium. Without enough vitamin D, animals can have weak bones and skeletal deformities. So, rickets can be a symptom of vitamin deficiency diseases in livestock.

In summary, the correct answer is option D, improved fertility. The other options, scurvy, loss of appetite, poor blood clotting, and rickets, can all be symptoms of vitamin deficiency diseases in livestock. It's important for farmers and animal caretakers to make sure their animals have a balanced diet with all the necessary vitamins to prevent these diseases.