兽医产科学5.ppt

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Ⅶ 诱 导 分 娩 Induction of Parturation 诱导分娩亦称人工引产,是指在妊娠末期的一定时间内,人为地诱发孕畜分娩,生产出具有独立生活能力的仔畜. 一、适用情况 （一）生理状态 （二）病理状态 二、技术原理 三、方法步骤和注意事项 * * 2011 Artificial Induction of Parturition: Reasons: Time parturition to labor costs Avoid dystocia (Large Fetus) How to do it: Give ACTH Give Corticosteroids. (Dexamethasone) Give PGF2a Give Oxytocin Need to know status and size of fetus Must have Management First! Must Know Breeding Dates!!! * * 2011 Cow- Do not induce before last 7-14 Days of gestation Method: Dexamethasone - parturition in 48 hours, 20~50 mg/IM -High incidence of retained placentas and lower postpartum fertility. Azium (trade name) combined with 25 mg Lutalyse(律胎素) induces within 35±2 hours. Requires a live fetus work, does not work on a mummified fetus If cow are induced early Retained placenta is not problem if treated properly - Giving estrogen before induction of parturition incidence Prostaglandins -used in cases of a mummified fetus and are also effective in inducing abortion the first 4~5 months * * 2011 Sheep - Best within a few days of parturition Dexamethasone (8~20 mg) Parturition in 24~72 hours 5 ~ 7 days Retained placenta not a problem Can use Lutalyse to abort before Day 50 of gestation Goat - CL is important throughout pregnancy Can use Lutalyse to induce 5~7 Days prior to normal time of parturition * * 2011 Sow - Do after day 111 of gestation PGF2a (Lutalyse 10 mg/IM) parturition in 29~48 hours. Note that this is less than 3 Days from normal parturition Close synchrony - Lutalyse at 8 AM followed by oxytocin 40 IU 24 hours later. Sows farrow between 8 AM and 5 PM (32 hours from start) Piglets should be born with