1 / 8

Hormones and Artificial Insemination

Hormones and Artificial Insemination. Homework. Make a poster summarising the key points of reproduction in farm mammals. Hormones. The reproductive cycle is controlled by hormones. The female hormone is called oestrogen and triggers the release of eggs from the ovary.

yamin
Download Presentation

Hormones and Artificial Insemination

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hormones and Artificial Insemination

  2. Homework • Make a poster summarising the key points of reproduction in farm mammals.

  3. Hormones • The reproductive cycle is controlled by hormones. • The female hormone is called oestrogen and triggers the release of eggs from the ovary. • Sheep produce more oestrogen when the days get shorter so the lambs are born in spring. • Cattle and pigs come into heat when a male is nearby and they can smell his pheromones. • Hens release eggs as the days get longer in the spring.

  4. Male Hormones • The male hormone is called testosterone. • Testosterone is produced by the testes and gives the male characteristics. • Males being kept for meat are sometimes castrated. This helps the male grow better and be less aggressive. • Sheep farmers can put a sponge containing testosterone in the ewes vulva. This stops them coming into heat. When the sponges are removed all the flock comes into season at the same time. Why is this a good thing for the farmer?

  5. Problems With Keeping Bulls • Dangerous • Expensive to buy and keep • Can lead to inbreeding • Does not allow other breeds to be sired eg.dairy cows producing beef calves

  6. Artificial insemination • This is the process where the male’s sperm is put into the female’s body with out the act of mating. It has a number of advantages and disadvantages.

  7. AI means the farmer can select ________ that he wants from the bull in the catalogue. It enables sperm to be used more economically since the _________ of one bull could father 250 calves. Sperm is also easier to freeze, _____ and ________ than a bull and the farmer doesn’t have the danger and _________ of a bull on the farm. The farmer can also use a number of different ______ of cattle. Words to use: breeds, transport, ejaculate, characteristics, store, workload.

  8. The disadvantages are that the farmer must know when the cow is on _____ and it is not suitable for animals that are not inspected regularly to check if they are in ______ e.g. _________. Words to use: oestrus, heat, sheep.

More Related