恰当的配种时间素材.pptVIP

Knowing When to Breed (Timing of Insemination)知道何时配种 (输精时间) Vocabulary 词汇 WEI = wean to estrus interval (time from weaning to onset of estrus)WEI = 断奶到发情间隔 (从断奶到开始发情的时间间隔) WSI = wean to service interval (time from weaning to standing estrus at the 1st estrus following weaning)WSI = 断奶到配种间隔 (从断奶到第1次发情后的呆立反应的时间间隔) WCI = wean to conception interval (time from weaning to time when sow actually conceive)WCI = 断奶到受胎间隔 (从断奶到母猪实际受孕的时间间隔) Insemination Timing 输精时间 Time of insemination relative to ovulation affects:和排卵相关的输精时间会影响到: Percentage of eggs fertilized, 受精卵的比例; Normal embryos, 正常胚胎数; Conception and farrowing rate, and 受胎率和分娩率; Litter size. 窝仔数 Consequently proper timing is very important in obtaining high reproductive efficiency. 因此要获得高繁殖效率, 正确的输精时间非常重要 Effect of insemination timing relative to ovulation on fertilization rate (Seode et al., 1995)和排卵相关的输精时间对受精率的影响 Insemination Timing 输精时间 If fertilization rate is highly dependent upon 1st insemination being within 0-24 h prior to ovulation and ovulation is related to estrus duration then it is important to determine when estrus begins.如果受精率极大地取决于第1次输精, 即排卵前的0-24小时, 而排卵又和发情期有关, 那么确定发情何时开始就很重要 How frequently should you check for estrus to help assure that the 1st insemination is within the desire time frame?查情几次才能有助于确保第1次输精在需要的时间段内呢? Insemination Timing: estrus determination (7 commercial farms; Knox et al., 2002) 输精时间: 确定发情(7家商业猪场) Insemination Timing 输精时间 Ovulation is normally thought to take place approximately 70% of the way through estrus. 通常排卵发生在发情期的70%段 But can vary from 39 to 133% for individual sows. 但个体母猪的差异可达39-133% In addition the duration of estrus can vary from 10 - 96 h除此之外发情时间可有10-96小时不等 Suggested intervals for inseminating weaned sows when detecting estrus once or twice per day每天查情1或2次时断奶母猪建议输精时间 Insemination Timing 输精时间 High variation in duration of estrus 发情期长短的高差异 + Wide variation in when ovulation occurs in relation to the onset of estrus 和发情开始相关的排卵开始时间的巨大差异 = Onset of estrus alone i