Kostov L, Bogdanov M, Zlatev D
Vet Med Nauki. 1979;16(3):63-70.
Experiments were carried out under conditions existing in industrial swine complexes with two groups of experimental sows: I group -- consisting of 17 sows injected on the 108th and 109th day of pregnancy with 175 g cloprostenol, and II group -- consisting of 145 sows injected on the 110th, 111th, 112nd and 113th day of pregnancy. On 125 sows of 110--111 day of pregnancy a reduced single dose application of 150 g cloprostenol was tested. Studies were performed on the period to farrowing following cloprostenol injection, the duration of farrowing, the changes in physiological behaviour, the number of viable and unviable new born piglets, the results following weaning of offspring at the age of 28 days and on the economic evaluation of the technology of forced synchronized and programmated farrowing in industrial swine complexes. It was established that the synthetic analogue of prostaglandine F2L (cloprostenol) applied once by intramuscular injection at a rate of 175 g per sow on the 110--113th day of pregnancy has a luteinizing effect and leads to forced synchronized farrowing of 75--80% of the sows, 27 +/- 5 h post treatment. Similar results were obtained by a reduced rate of 150 g cloprostenol. Synchronized farrowing provides an opportunity for simultaneous weaning of equated piglet groups and contributes for better labour organization and veterinary service. Shortening the pregnancy period below the 110th day is not feasible physiologically and economically.
实验在工业养猪场的现有条件下，对两组实验母猪进行：第一组——由17头母猪组成，在妊娠第108天和第109天注射175克氯前列醇；第二组——由145头母猪组成，在妊娠第110天、第111天、第112天和第113天注射。对110 - 111天妊娠的125头母猪测试了150克氯前列醇的减少单剂量应用。研究了氯前列醇注射后至分娩的时间、分娩持续时间、生理行为变化、存活和未存活新生仔猪数量、28日龄仔猪断奶后的结果以及工业养猪场强制同步和程序化分娩技术的经济评估。结果表明，在妊娠第110 - 113天，以每头母猪175克的剂量肌肉注射一次前列腺素F2L的合成类似物（氯前列醇）具有黄体溶解作用，可使75 - 80%的母猪在治疗后27±5小时强制同步分娩。以150克氯前列醇的减少剂量也获得了类似结果。同步分娩为同时断奶等量仔猪组提供了机会，并有助于更好地组织劳动力和提供兽医服务。将妊娠期缩短至110天以下在生理和经济上都是不可行的。
