sowandgiltmanagementtechniques经产母猪和后备母猪管

sowandgiltmanagementtechniques经产母猪和后备母猪管内容摘要：

more gilts没有增加足够的后备母猪 – Less selection选择少 – Breed of marginal边缘配种 • Poor P1 and sow performance头胎和经产母猪性能差 (Williams, Patterson, and Foxcroft. Banff Pork Seminar, 2020) United Feeds Research Parturition Mass 分娩重 165  kg 193  kg Average Litter Growth (kg/d)平均窝增重速度（公斤 /天） Percentage of largest 16 ovarian follicles  at weaning断奶时最大的 16个卵泡大于 百分比 % % Parturition Mass 分娩重 kg kg Sows in estrus within 9 days after weaning断奶后 9天内母猪发情比率 58% 86% Ovulation Rate排卵数 (Clowes et al., 2020) (MejiaGuadarrama et al., 2020) Effect of body weight at parturition on subsequent reproductive and litter performance分娩时体重对随后的繁殖和窝仔生长性能的影响 United Feeds Research Effective “selection” techniques有效的“选择”技术 • “ Selected” gilts respond early to boar contact 选择对公猪接触反映较早的后备母猪 • “Selection” should include a recorded estrus选择需要包括有记录的发情 • “Selection should occur below market weight选择需要在达到上市体重之前进行 • “Nonselect” gilts should be culled选不上的后备母猪要淘汰 United Feeds Research At what age does puberty “naturally” occur in gilts?在多大日龄后备母猪自然达到性成熟 What factors are important in determining age at puberty?哪些因素对决定性成熟日龄比较重要  Age of boar introduction 引入公猪接触的日龄  Direct stimulation with boars公猪的直接刺激  Good heat detection management好的发情检测技术 •120 to 200+ days日龄 United Feeds Research 01020304050607080901000 6 9 12 15 18 21 24 27 30。