高产奶牛连续活体采卵及卵母细胞体外受精研究

在超声波扫描仪的指导下,用双孔型采卵针以11.3～12.0kPa抽吸压经阴道对8头高产奶牛分别连续实施7次活体采卵,每4d1次,共采集卵子340个,占可见卵泡数的53.5%.每次头均采集卵子6.1个.卵子经过体外培养、体外受精、体外受精胚体外发育培养,于体外受精后48h、168h统计的卵裂率、囊胚发育率分别为75.0%和29.7%.研究结果表明,在超声波扫描仪指导下对奶牛连续进行活体采卵,将所得卵子进行体外成熟、体外受精、体外培养,在生产中是可行的.

Identification and molecular evolution of cow CENP-A gene family

The centromere protein A (CENP-A), a histone H3-like protein, provides an essential role for chromosomal segregation during mitosis and meiosis. In this study we identified ten new CENP-A-like genes (excluding the original CENP-A gene) in cow by searching

Effect of microwave treatment on chemical composition and in sacco digestibility of wheat straw in yak cow

Wheat straw was treated with microwave for 4 min and 8 min at a power of 750 W and frequency of 2,450 MHz. Chemical compositions of untreated, 4 min treated and 8 min treated Straws were analyzed and in sacco degradabilities of all these straws in yak rumens were measured. Microwave treatment didn't significantly (p > 0.05) affect the chemical composition of the straw. In sacco dry matter (DM) degradability of the straw after 18 h incubation in rumen was significantly (p < 0.01) improved by microwave treatment. In sacco crude protein (CP) degradability of the straw was not (p > 0.05) affected by microwave treatment. In sacco organic matter (OM) degradability of the straw was increased (p < 0.01) by around 20% for both the 4 min and 8 min microwave treatment, that of acid detergent fibre (ADF) was increased (p < 0.01) by 61.6% and 62.8%, and that of ash free ADF was enhanced by 72.1% and 69.6% for the 4 min and 8 min microwave treatment respectively. No significant difference was observed between the 4 min and 8 min microwave treatment on the degradability of DM, OM, CP, ADF and ash-free ADF of the straw.