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。
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.
出处
《遗传》
CAS
CSCD
北大核心
2003年第2期155-159,共5页
Hereditas（Beijing)
基金
国家自然科学基金(39360058)资助
