奶牛配种与繁殖管理 陈楷行.pptVIP

* * * * * * * * * * * * * * * * * * * * 同期排卵CIDR Synchronization（赛得宝） Day 0 Day 7 48 Hours 12-16 Hr 促性腺激素 GnRH 前列腺素 PGF2α 促性腺激素 GnRH 配种 AI CIDR for 7 days 使用孕激素栓7天 同期排卵和预处理同期排卵Ovsynch versus Presysnch 预处理保证同期排卵开始时更多的牛有黄体 受胎率高（高10%左右） 对发情周期有好的影响 有些牛在第二次注射前列腺素后就配种 费用较高是主要的弊端 同期排卵的成本效益Cost/Benefit of Synchronization 不同牛场的情况不同 劳力成本 发情鉴定的效率 奶牛/子宫的健康 药物成本 PG10元 GnRH 7元 一次同期排卵大约24元 牛奶产量 低产量，低效益 空怀一天的成本 在美国，产后150天以后3-4美元/天 繁殖计划的示范之一 主动停配期：产后50天 产后70天，如果还没有配种 同期排卵：GnRH – PG – GnRH – 配种 配种后40天做孕检，如空怀 同期排卵 繁殖计划的示范之二 产后28-30天开始做预处理同期排卵 PG –14天 - PG – GnRH – PG – GnRH – 配种 配种后40天做孕检，如空怀 重复同期排卵 或采用超声波28天孕检，如空怀 重复同期排卵 谢谢！ * * Totals do not include last two cycles. Standard VWP is 50 DIM. This table shows the advantage of larger numbers and disadvantage of small numbers when trying to look at averages. * * This dairy really has a 45 Dim VWP. Slight differences can be seen. More animals on the list reflect that those breed before 50 DIM were not counted as eligible in the previous table. This is true despite the fact that they did get bred and some did get pregnant. It is important to remember that Pregnancy Rates are not an inventory of all breedings; they are a sampling procedure to measure breeding efficiency. It is critical that only those animals that meet the sampling criteria are using in the calculation * * * * * * * * * * * * * * * * * * * * * * Some General Recommendations with the semen tank: LN2 evaporates colorless, odorless and tasteless. It may cause suffocation in poorly ventilated areas Vacuum may last up to 10 years in well managed tanks. Cork cannot be hermetical to allow for the normal LN2 evaporation. it may explode!! The neck is the weakest point. Avoid sudden movements, and be gentle when moving it . If the outer shell frosts, the vacuum has been lost and you have a few hours to transfer the semen to another tank Keep an accurate inventory… you cannot physically count your straws by hand!! * * * * * * * * * * * * * * * * * * * * * * *