摘要： 通过2n=50和2n=49两种核型三品种杂交水牛繁殖记录分析和其中2n=49三品种杂交水牛联会复合体及其精子染色体研究，结果表明，后者虽然公母都是可育的，由于它产生两种正常配子（n=24，n=25）和两种异常配子（n=24+1，n=25-1），自群繁殖导致其子代染色体多态性（2n=50，2n=49和2n=48）；其异常配子，与正常配子结合，则产生非整倍性，致其繁殖力降低，表现为情期配种受胎率降低12.3%；年受胎率降低6.4%；产仔间隔长97.6天；终生（11岁）产仔数减少1.33～1.54头。
Abstract:After analysis of reproduction records of two types of karyotypes (2n=50 & 2n=49) of triple crossbreed buffaloes (TCB) and studies of synaptinemal complex and sperm chromosome of 2n=49 TCB,the results showed that 2 sorts of normal gametes (n=24 and n=25) and 2 sorts of abnormal gametes (n=24+1 and n=25-1) were produced in 2n=49 TCB.Thus,both male and female of 2n=49 TCB are reproducible,and chromosomal polymorphyism (2n=50,2n=49 & 2n=48) occurred in the progenies after intermating.But its fertility decreased because of aneuploidy combined between normal and abnormal gametes.Compared with 2n=50 TCB,the conception rates for individual inseminations and for whole year reduced 12.3% and 6.4%,calving interval were prolonged by 97.6 days,and calf numbers in its lifetime (up to 11-year old) were lower by approximate 1.5 calves,respectively.