Lesson 16 – Artificial Insemination Pt 1

Lesson 16 – Artificial Insemination 1 Semen Collecting and Processing   1. Artificial Vagina – Used to collect semen in bulls, stallions, rams and buck goats. 2. Collection – Semen is actually collected by having the male mount an estrous female or by training them to mount another animal.    For example in cattle, steers are often times used for the bulls to mount. Semen from boars is not done with an artificial vagina. It is done by applying pressure to the extended penis with a gloved hand as the animal mounts another animal or object. 3. Electro ejaculator – This is used to collect semen from bulls and rams that are hard to stimulate or don’t have semen collected often. A probe is inserted into the rectum and an electrical shock causes ejaculation. Semen Collecting and Processing    4. Evaluation – Once collected semen is evaluated for volume, sperm concentration, motility of the sperm, and sperm abnormalities. 5. Processing – Once evaluated, sperm is mixed with extender to decrease the concentration. Only 10 million sperm are needed per straw. Many straws can be made from one ejaculate. The extender is made from nutrient-rich milk or egg yolk, a buffer, antibiotics and glycerol. 6. Storage – Some semen is used fresh; however, it can only be used this way for a couple of days. Most semen is frozen in liquid nitrogen and stored indefinitely. Some species’ semen cannot be stored in liquid nitrogen, though. Signs of estrus in different species of animals     Signs of estrus in cattle –The best sign of estrus is standing heat. Standing heat is when the female stands still to be ridden by a male or another female. Secondary signs of estrus are restlessness, attempting to mount other cows, and a clear, mucous discharge from the vagina. Signs of estrus in sheep and goats – Is checked by using sterilized males with marking devices. Signs of estrus in gilts and sows – Swine in heat assume a rigid stance when hands are placed on their back. Signs of estrus in mares – Elevation of the tail, frequent urination, and contraction of vulva. (A.S.Repro.11.T.M.C) Proper timing of insemination in several different species of animals. Cows – 12 hours after standing heat.  Goats – 10-12 hours after the beginning of estrus.  Sows and Gilts – At the end of the first day and beginning of the second day of estrus.  (A.S.Repro.11.T.M.D)   In the next slides, try to guess what the pictures are After you guess what the pictures are, then guess what their importance is. When you are ready for the answer please click This is important because it can carry most of the equipment needed to A.I. a cow or heifer. It is also a handy way to keep all of your equipment organized and somewhat clean. Please wait for the animation •Paper towels are used to keep things clean •After the semen comes out of the cito thaw, you use paper towels to wipe off the water because water kills semen •You use the paper towels to put over the end of the A.I. Rod so that no dirt gets into the straw of semen Paper Towels Safety Glasses • Used when: to protect your eyes • you are around the liquid nitrogen • you are thawing the semen because a straw may explode in your eyes Cotton Glove • A cotton glove is used to protect your hand when you get the semen out of the liquid nitrogen refrigerator Cito Cutter •Used to cut the melted end of the straw off •It gives you a square cut so that you can seed the straw more secure into the sheath When you are ready for the answer please click Tweezers It is an easier way to get the straws out of the goblets and it also makes it quicker When you are ready for the answer please click Shoulder Length Glove •A shoulder length glove is important to keep your hands clean. •Protects the cow from some infection and diseases. Lube Put this on your shoulder length glove to make it easier to insert your hand into the cow or heifers rectum When you are ready for the answer please click