University of Novi Sad, Faculty of Agriculture, Novi Sad, Republic of Serbia.
Theriogenology. 2011 Oct 1;76(6):1022-6. doi: 10.1016/j.theriogenology.2011.05.004. Epub 2011 Jun 30.
About 30% of the total number of gilts selected for reproduction at the large breeding farm units in Vojvodina (Republic of Serbia) are culled due to prolonged pre-insemination anoestrus (estrus not detected until 8 mo of age). The aim of this study was to provide the answer to the following question: do the culling gilts reach cyclic ovarian activity at all? One hundred seventy five culled gilts in which external estrus manifestations were not detected by 8 mo of age were sacrificed and their reproductive organs were examined for determination of sexual maturity (ovaries exhibiting pre-ovulatory follicles 8 to 11 mm in diameter, corpora hemorrhagica, corpora lutea and corpora albicantia). Uterine weights and horn length were also determined. Functional ovaries were observed in 107 (61.1%) examined gilts, with 62 animals having one and 45 having two puberty ovarian cycles (57.9% and 42.1%, respectively). Pathomorphological changes which could result in prolonged pre-insemination anoestrus were not observed on the reproductive organs of sexually mature gilts. Our results indicate that most of the culling gilts have reached cyclic ovarian activity. The main reason for culling due to the absence of external estrus manifestations in sexually mature gilts could be inadequate estrus detection technology.
在塞尔维亚伏伊伏丁那的大型养殖单位中，大约有 30%的后备母猪因发情期延长（发情直到 8 月龄仍未被发现）而被淘汰。本研究旨在回答以下问题：淘汰的后备母猪是否能达到周期性卵巢活动？对 175 头 8 月龄仍未出现外部发情表现的淘汰后备母猪进行了屠宰，检查其生殖器官以确定性成熟（卵巢出现直径 8-11 毫米的排卵前卵泡、出血黄体、黄体和白体）。还测定了子宫重量和角长度。在 107 头（61.1%）检查的后备母猪中观察到功能性卵巢，其中 62 头动物有一个青春期卵巢周期，45 头有两个（分别为 57.9%和 42.1%）。在性成熟后备母猪的生殖器官上未观察到可导致发情前延长的性器官病理变化。我们的结果表明，大多数淘汰的后备母猪已经达到了周期性卵巢活动。在性成熟后备母猪中，由于缺乏外部发情表现而被淘汰的主要原因可能是发情检测技术不足。
