| 4. | The disease , low quality of embryo , semen contamination , breeding out of time , low quality of recipient , not synchronous estrus between donor and recipient , antiquated preserve to embryo , hereditary unsoundness , accidental injury by medicament , vaccination , feeding and management to depart from science , immunological reaction and multiple embryo in uterus are the more important factors
这些因子主要包括疾病、胚胎质量差、精液污染、不适时配种、受体羊质量差、供受体羊发情不同步、胚胎保存时间长、遗传缺陷、误用药物、接种疫苗、饲管不科学、免疫反应、子宫内多胚等。 |
