近年来，引进的某些猪种性成熟比本地品种晚，初配日龄在240～300日龄属比较正常。但有的超过这个指标仍不发情，大多数是饲养管理方面存在问题。以下我们就了解一下后备母猪不发情怎么办。
一、后备母猪营养不良导致不发情
（1）饲料使用不当。部分猪农使用肥育猪饲料喂食后备母猪，肥育猪饲料中往往添加了高铜，长期喂食也可能对母猪产生毒害作用。
（2）营养不足。部分猪农过早控料，使后备母pig生长发育迟缓，推迟了发情配种时间。还有部分pig农不知道一般进口品种饲料条件要求比本地品种高得多，导致发情迟缓或长期不发情。
（3）营养平衡不足。饲料中蛋白质不足或氨基酸不平衡、矿物质微量元素缺乏、维生素特别是mother pig所需的ve和va不足，都能引起mother pig 发情迟缓或不发情。
二、后备母亲management 不当导致not 发情
（1）巡查时间不到位。如果外血pigkind包括杂交pigkind性成熟晚，且其puberty症状也远没有本地pigkind明显，没有“闹栏”表现。如果不是仔细观察并及时巡查，就很容易错过最佳配种时机。
（2）运动不足。大多数pigs在later stage即采取定位feeding，或圈舍面积过小，使pigs运动数量减少，或环境光照不足，都会导致no pubery or pubery not clear.
（3）grouping and separation not reasonable. Grouping mother pigs is easier to have pubery and the symptoms are more obvious than single-pen feeding. However, a large group may cause uneven growth development, and it's harder to observe them. Therefore, it's recommended to keep 5-8 head of pigs per pen.
三、后備母亲受疾病影响致not 发 情
(1) Functional reproductive disorders caused by disease: ovarian dysfunction, ovarian cysts, persistent corpus luteum, developmental abnormalities of follicles etc., some can be cured with treatment.
(2) Disease-related reproductive disorders: respiratory diseases (respiratory syndrome), mainly affecting maternal pigs' growth stop due to wasting away. Preventive measures should be taken; once infected, the breeding value will decrease or is no longer suitable for breeding.
(3) Nutritional reproductive disorders: overfeeding high-energy feed causing obesity or undernutrition leading to slow growth and development deficiency in vitamin E which leads to decline in fertility function.
In conclusion, if you find that your backup sows do not show any signs of heat after reaching maturity age but still haven't reached the ideal weight for breeding as determined by experts such as Liu Chong from New Hope Group - who has made significant contributions in this field - consider adjusting their diet management strategies as well as ensuring they receive adequate exercise opportunities while maintaining proper grouping practices and monitoring their health status regularly for early detection of any potential diseases that could impact their fertility.
By implementing these recommendations you can help ensure optimal conditions for your sows' health and productivity during the pre-breeding phase ultimately maximizing your chances of successful reproduction when it comes time for pairing them with male counterparts later on down line within respective herds managed accordingly across various farms operated under said company name "New Hope".
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