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RATS

RATS. RATS. Usually very friendly and accept handling and gentle manipulation Rarely bite. GENERAL RESTRAINT. Grab over neck and shoulders Place forefinger just below mandible on one side of head and thumb on opposite side either above or below forelimb

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RATS

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  1. RATS

  2. RATS • Usually very friendly and accept handling and gentle manipulation • Rarely bite

  3. GENERAL RESTRAINT • Grab over neck and shoulders • Place forefinger just below mandible on one side of head and thumb on opposite side either above or below forelimb • Provide additional support by holding tail and hind limbs with opposite hand

  4. Scruffing Technique • Same as in gerbils and mice • Don not like it

  5. Full Restraint • Wrap in thin towel or stockinette • Syringe case with air hole • Cone shaped polyethylene bag with tip cut off

  6. http://awic.nal.usda.gov/nal_display/index.php?info_center=3&tax_level=3&tax_subject=183&topic_id=1093&level3_id=6273&level4_id=0&level5_id=0&placement_default=0http://awic.nal.usda.gov/nal_display/index.php?info_center=3&tax_level=3&tax_subject=183&topic_id=1093&level3_id=6273&level4_id=0&level5_id=0&placement_default=0 • http://www.bva-awf.org.uk/resources/tutorials/BVA02-Introduction.html

  7. Laboratory Animal Handling Technique - Rat • Intraperitoneal injection • Blood collection from tail vein • Blood collection from cardiac puncture • Oral feeding • Chemical Restraint

  8. Intraperitoneal Injection in Rat • The most common method of administering drugs to rats

  9. Tools for intraperitoneal injection in rat • 75% alcohol cotton ball for surface disinfection • medium size towel for restraining the rat • 25G 5/8” needle with 1cc syringe for injection

  10. Let the rat relaxes on the top of the lid.

  11. Stretch the body of the rat by pulling up it’s tail and then cover the rat with a towel by your left hand

  12. Fold the skirts of towel under the rat from all directions

  13. Grasp up the left hindlimb of the rat to expose the abdomen

  14. The injection site should be in the lower left quadrant of the abdomen because vital organs are absent from this area

  15. Only the tip of the needle should penetrate the abdominal wall to prevent injection into the intestines.

  16. Collection of blood from tail vein in rat • small amount: 0.1-1 ml

  17. Tools for collection of blood from tail vein • 75% alcohol cotton ball for surface disinfection • 27G1/2” needle with 1 ml syringe for blood withdrawal • a vial for blood collection

  18. Optimal site of blood withdrawal is around the distal one-third of the tail since this part of tail gives better visualization of the veins

  19. The rat's tail has a thermoregulatory function: it serves as a heat-loss organ. The tail is well suited for this purpose, because it has no fur, has a large surface to volume ratio, and is perfused with many blood vessels, especially at the tail tip and midlength (Yulong et al. 1995).

  20. Temperature influence Rats control their body temperature through their tails by dilating or constricting their tail blood vessels.

  21. Disinfect the tail with 75% alcoholic cotton ball

  22. When the needle penetrates the epithelium of the tail, pull back the plugger a bit to create negative pressure inside the syringe, then push the needle in the vein slowly until blood get into the dead space of the needle head

  23. Pull back the plugger by the ring finger to withdraw blood from the tail vein

  24. Using a scalpel to make a small wound on the tail is also an option for collecting blood from tail vein

  25. Blood can be collected b using a pipetteman after then

  26. Collection of Blood from Cardiac puncture in Rat • General anesthesia needed • Large amount: up to 3% of body weight

  27. Tools for collection of blood from cardiac puncture • 75%alcohol cotton ball for surface disinfection • 24G needle with 10cc syringe for blood withdraw • 15 cc centrifuge tube for blood collection

  28. Disinfect the left thorax with 75% alcoholic cotton ball

  29. Search for the point of maximum heart beat

  30. Insert the needle straight on the selected point and withdraw blood by your left hand

  31. http://www.jove.com/index/Details.stp?ID=266

  32. Oral Feeding in Rat • Feeding amount limited to 1% of body weight

  33. Tools for oral feeding in rat • 16 G ball-tipped feeding needle with syring • Leather glove

  34. Restrain the shoulders of the rat by your thumb and index finger, then support the lower limbs with your right hand

  35. Restrain the tail of the rat in between your ring finger and little finger

  36. Let the rat lying on your left palm and introduce the ball-tipped feeding needle from the pharynx in to the esophagus when the rat is in the act of swallowing

  37. CHEMICAL RESTRAINT SEDATION AND TRANQUILIZATION

  38. ACEPROMAZINE • Mild tranquilizer • Dose: 0.5 – 2.5 mg/kg IM or SQ • Lower dose for IM • Higher dose for SQ

  39. DIAZEPAM • Mild sedation • Dose: 3-5 mg/kg IM • IM injection may be irritating to muscle

  40. FENTANYL/DROPERIDOL • Excellent sedative • Can see narcotic induced respiratory depression with higher doses • Primarily used in rats and mice • Doses • Rats • 0.13 – 0.33 ml/kg IM • Provides sedation and anesthesia for minor procedures

  41. ANTICHOLINERGICS • Used as a premed • Decrease salivation (Ketamine, inhalants) • Maintain heartrate • Atropine • 0.05 mg/kg SQ • Glycopyrrolate • 0.01 – 0.02 mg/kg SQ

  42. CHEMICAL RESTRAINT INJECTABLE ANESTHESIA Clinical Laboratory Animal Medicine book Page-91

  43. XYLAZINE/KETAMINE • Short duration of action (30 minutes) • Rats • Xylazine: 5-10 mg/kg + Ketamine: 40-80 mg/kg IM or IP • Mice • Xylazine: 5-10 mg/kg + Ketamine: 50-200 mg/kg IM or IP

  44. KETAMINE/ACEPROMAZINE • Adequate restraint for minor surgical procedures • General Rule: the smaller the species, the greater the dose needed for adequate effect • Rats and Mice • Acepromazine: 2.5-5 mg/kg + Ketamine 75-80 mg/kg IM or IP

  45. TILETAMINE-ZOLAZEPAM • For minor surgical procedures • Dose • 20-40 mg/kg IM or IP • Can have prolonged recovery • Used in combination with xylazine • Decrease dose to 5-10 mg/kg • Better effect and faster recovery

  46. INHALANT ANESTHESIA • Use for any major surgical procedure • Induce with gas alone or with injectable anesthetics • Isoflurane is the agent of choice

  47. REFERENCES • Birchard, S.J., & Sherding, R.G. (2000). Saunders Manual of Small Animal Practice, Second Edition. Phildephia, PA. WB Saunders Company. • Fowler, M.E. (1995). Restraint and Handling of Wild and Domestic Animals, Second Edition. Ames, IA. Iowa State University Press. • Frye, F.L. (1994) Reptile Clinician's Handbook: a compact clinical and surgical reference. Krieger Pub Co. • Beynon, P.H. (1992) Manual of reptiles. Cheltenham, Gloucestershire. British Small Animal Veterinary Association. • Hillyer, E.V., & Quesenberry, K.E. (1997). Ferrets, Rabbits and Rodents: Clinical Medicine and Surgery. Philedephia, PA. WB Saunders Company

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