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ARTIFICIAL INSEMINATION SCHOOL CARLOS TELLEZ D.V.M. - ALTA GENETICS

ARTIFICIAL INSEMINATION SCHOOL CARLOS TELLEZ D.V.M. - ALTA GENETICS. DEFINITION.

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ARTIFICIAL INSEMINATION SCHOOL CARLOS TELLEZ D.V.M. - ALTA GENETICS

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  1. ARTIFICIAL INSEMINATION SCHOOLCARLOS TELLEZ D.V.M. - ALTA GENETICS

  2. DEFINITION 􀂉 A.I is the instrumental technique used to deposit semen in to the body of the uterus of a female in estrus (heat), to obtain a pregnancy Create Value ▲Build Trust ▲Deliver Results

  3. ADVANTAGES 􀂉 1. Genetic improvement: A.I allows us the use of genetically superior bulls. 􀂉 2. Venereal disease transmission: Eliminates the risk of sexually transmitted diseases and improves the hygienic control. 􀂉 3. Management: Natural service sires can be dangerous for both cows and people. 􀂉 4. Economy: There is no need to work with herd bulls, saving the costs for feed, transport, housing and veterinary expense.

  4. CONSIDERATIONS 􀂉 1. Requires good management, a good nutrition program, effective herd health, accurate records. 􀂉 2. Requires accurate heat detection and trained AI technicians. 􀂉 3. Appropriate handling facilities.

  5. REPRODUCTIVE ANATOMY OFTHE COW Lumbar Vertebrae Sacral Vertebrae Coccygeal Vertebrae Rectum Body of uterus Vagina Ovary Vulva Cervix Infundibulum Oviduct Bladder Horn of uterus

  6. REPRODUCTIVE ANATOMY OFTHE COW 􀂉 Located on the pelvic floor just below the rectum. 􀂉 A. External genitals: Composed of the vulva, clitoris and vestibular glands. 􀂉 B. Vagina: It is a cavity that connects the vulva with the cervix. At natural service it receives the penis of the male.

  7. REPRODUCTIVE ANATOMY OFTHE COW Uterus: The main roll of the uterus is to feed, protect and offer shelter to the fetus until the calving moment. It consists of three parts: cervix, body of the uterus and two uterine horns.

  8. REPRODUCTIVE ANATOMY OFTHE COW Cervix: 1 to 5 inches long and 1 to 3 inches in diameter. It is made up of fibrous tissue, which is dense and hard to the palpation. Position of the cervix may vary with age of cow.

  9. REPRODUCTIVE ANATOMY OFTHE COW Body of the uterus: Located anterior to the cervix this structure is the place where the semen should be deposited (target site). It is made up of soft tissue and it is usually one (1) inch long.

  10. REPRODUCTIVE ANATOMY OFTHE COW Uterine Horns: Each one is approximately from 8 to 16 inches of length and they are connected to their respective oviducts.

  11. REPRODUCTIVE ANATOMY OFTHE COW 􀂉 Ovaries: Approximately 1.5 inch in length, 1 inch in width and ½ inch in thickness. Their main function is to produce eggs and the secretion of hormones (estrogen and progesterone). 􀂉 Oviducts: Tubs that connect the ovaries with the uterine horns. It provides the site of encounter (fertilization) between the ovum and the sperm.

  12. REPRODUCTIVE ANATOMY OFTHE COW (OVARIES)

  13. PHYSIOLOGY OF THE ESTRUSCYCLE

  14. ESTRUS CYCLE 􀂉 The estrus cycle in dairy cattle is between 18 to 24 days, with an average of 21 days. 􀂉 The estrus cycle is divided in 4 phases: Estrus, Metestrus, Diestrus and Proestrus.

  15. ESTRUS (HEAT) It is the period (12 to 18 hours) in which the cow is receptive to the bull. In this phase the Estradiol is released by the dominant follicle and its level is increased in the bloodstream causing the release of GnRH (gonadotropin releasing hormone) from the hypothalamus and a surge of LH (luteinizing hormone) is released from the anterior pituitary. It is in this moment when the cow begins showing the sings of estrus (heat). Ovulation occurs 12 to 16 hours after the end of the estrus (heat).

  16. METESTRUS This stage lasts 4 days and begins after ovulation with the formation of a CL (corpus luteum). The action of the LH (luteinizing hormone) and Progesterone secreted by the corpus luteum, inhibits the FSH (follicle stimulating hormone) released by the pituitary gland. If pregnancy recognition occurs, the CL will continue to produce progesterone to maintain the pregnancy.

  17. DIESTRUS This phase (12 to 13 days) is controlled by progesterone. A mature CL is established and if the cow is not pregnant, prostaglandin f2ά will be released by the uterus on day 16 of the estrus cycle causing the regression of the CL.

  18. PROESTRUS (4 to 5 days). After the regression of the CL a new surge of GnRH, FSH and LH is released by the hypothalamus and pituitary gland causing the growth of a dominant follicle necessary for the next behavioral estrus and posterior ovulation.

  19. HORMONAL REGULATION

  20. SIGNS OF ESTRUS (HEAT) 1. Aggressive behavior (prior to estrus). 2. Attempts to mount other cows. 3. Smell vulva of other cows. 4. Swollen Vulva. 5. Rubbed off tail, muddy flanks. 6. Mucus (vulva). 7. STANDS TO BE MOUNTED

  21. SIGNS OF ESTRUS

  22. SIGNS OF ESTRUS

  23. TAIL CHALK Tail chalk should be positioned starting two inched behind the pin bones to the tip of the tail head in a 3/4inch thick stripe. Each cow should receive one stripe of chalk per day.

  24. TAIL CHALK 􀂉 The objective is to make the chalk appear uniform so that even slight signs of estrus are noticeable. 􀂉 Improper chalking Will lead to false positives and missed heats.

  25. ESTRUS SYNCHRONIZATION 􀂉 Ovsynch 􀂉 10 Day Cosynch 􀂉 Heatsynch 􀂉 Presynch 􀂉 Resynch 􀂉 Prostaglandin Programs 􀂉 CIDR Programs 􀂉 MGA Programs

  26. OVSYNCH 􀂉 Monday=Day 0 2cc GnRH 􀂉 Monday=Day 7 PgF2a 􀂉 Wednesday=Day 9 2cc GnRH 􀂉 Thursday=Day 10 Timed AI

  27. 10 DAY COSYNCH 􀂉 Monday=Day 0 2cc GnRH 􀂉 Monday=Day 7 PgF2a 􀂉 Thursday=Day 10 2cc GnRH and AI

  28. HEAT-SYNCH 􀂉 Monday=Day 0 2cc GnRH 􀂉 Monday=Day 7 PgF2a 􀂉 Tuesday=Day 8 0.5cc ECP 􀂉 Wednesday=Day 9 AI all in Estrus 􀂉 Thursday=Day 10 AI all Remaining

  29. STAGE OF CYCLE WHENSTARTED 􀂉 Cows started when having a dominant follicle perform better than those where a dominant follicle is not present 􀂉 Groups of cows serviced before 70 DIM do not perform as well as those serviced after 70 DIM when in a Synchronization Program

  30. FOLLICULAR WAVES

  31. PRESYNCH 􀂉 Pre-synchronization of Cows will allow a higher percentage of the cows to be in the most favorable stage of the Estrus Cycle when Synchronization is initiated 􀂉 Two injections of PgF2a are given 14 days apart and then the Synch Program is started 12 to 14 days after the 2nd PgF2a

  32. PRESYNCH-OVSYNCH-HEATSYNCH

  33. RESYNCH 􀂉 GnRH given 7 days before Preg Check will allow open cows to be serviced within 2 to 3 days when vet check is the same as “shot” day 􀂉 Best performance is achieved when started on days 28 through 34 after last insemination

  34. RESYNCH 􀂉 For those diagnosing pregnancy at 32 days or less, it is better to start the cows found open at the day of examination than it is to start them the week before 􀂉 Reason? Dominant Follicles

  35. PROSTAGLANDINS (PgF2a) 􀂉 PgF2a works by causing luteolysis of the existing CL 􀂉 Estrus will follow injection in 2 to 7 days 􀂉 Injections repeated in 11 to 14 days will improve synchronization with most heats in 2 to 5 days

  36. CIDR PROGRAMS 􀂉 Day 0 = CIDR In 􀂉 Day 6 = PgF2a 􀂉 Day 7 = CIDR Out 􀂉 Day 8 – 10 = Estrus Detection and AI

  37. MGA 􀂉 MGA fed at the rate of 0.5mg / head / day for 14 days 􀂉 Nineteen days later (day 33) = PgF2a 􀂉 Estrus Detection and AI 2 to 4 days after PgF2a (days 35-37)

  38. A.I EQUIPMENT Storage Tank 1. Clean and dry place. 2. Always carry it in vertical position. 3. Check nitrogen periodically

  39. A.I EQUIPMENT 􀂉 Thaw unit 􀂉 A.I Gun 􀂉 Plastic sheath 􀂉 Palpation sleeves 􀂉 Tweezers 􀂉 Straw cutter or scissors 􀂉 Paper towels 􀂉 Lubricant

  40. SEMEN HANDLING 􀂉 Wash hands prior to procedure. 􀂉 Prepare thaw unit with clean water 95 F 􀂉 Place thaw unit close to the tank 􀂉 Keep canister below frost line 􀂉 Use tweezers to transfer straw from the tank to the thaw unit. < 5 seconds. 􀂉 Straw should be thaw in 95 F water for a minimum of 40 seconds.

  41. SEMEN HANDLING 􀂉 Once thawed, straws cannot be refrozen. 􀂉 Pre-warm AI gun. 􀂉 Dry straw completely with a paper towel. 􀂉 Protect the straw from temperature fluctuations at all times. 􀂉 Cut the sealed end of the straw squarely and cleanly. 􀂉 Place plug end of straw into the gun. 􀂉 Place a sheath over gun and secure firmly.

  42. SEMEN HANDLING 􀂉 Advance semen to fill airspace in straw. 􀂉 Protect gun against temperature changes or contamination (gun warmer or shirt). 􀂉 Place semen into cow as soon as possible 􀂉 Prepare a maximum of 3 guns at a time.

  43. A.I. TECHNIQUE Once you are sure that the cow to breed is not pregnant and is in heat, check the identification number and the breeding records.

  44. A.I. TECHNIQUE Put on a shoulder length disposable plastic glove, lubricate it and stand sideways behind the cow. Form a cone with yours fingers, and gently insert the hand through the anal opening.

  45. A.I. TECHNIQUE Once the hand is fully in the rectum, open fingers from the cone position and remove the fecal matter if needed. Avoid excessive motion of your arm because it causes air to rush in the rectum, which will not allow you to grasp the cervix.

  46. A.I. TECHNIQUE Gently slide the hand from the upper part of the rectum to the lower part to identify the cervix. Hold the cervix having your thumb on the top and the rest of your fingers on the bottom.

  47. A.I. TECHNIQUE Thoroughly wipe the vulva area with a clean paper towel. This helps to prevent the interior of the reproductive tract from becoming contaminated and possibly infected.

  48. A.I. TECHNIQUE Insert the insemination gun through the vulva at a 40 to 45 degree angle until it touches the roof of the vagina. Level the insemination gun to go through the passageway to the cervix. This procedure avoids the possibility of entering the urethra located on the floor of the vagina

  49. A.I. TECHNIQUE While passing the insemination instrument through the vagina, push the cervix forward with the hand holding the cervix. This will stretch the vagina wall eliminating the possibility of the insemination gun getting caught in a vaginal fold or the blind pouch around the enter of the cervix. At this point the tip of the gun can be guided to the cervical canal by the fingers of the hand holding the cervix.

  50. BLIND POUCH Uterine Horn Ovary Dye Placed in blind Pouch Insemination Gun Cervix Vagina Ovary Bladder Uterine Horn

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