玛多县藏羊标准化饲养管理技术的应用与效果分析

本研究引入标准化饲养管理技术,旨在改善青藏高原果洛藏族自治州玛多县藏羊的饲养状况,并提升其生产性能和养殖效率。研究采用放牧+补饲方式进行管理,并与自然放牧群进行对比。结果显示,标准化养殖示范群在体重上表现更加稳定,12月—翌年3月期间体重下降幅度为6.50%,而自然放牧群为11.04%。此外,示范群成畜死亡率为2.25%,显著低于自然放牧群的4.27%。繁殖性能方面,初产母羊繁殖率达91.67%,比自然放牧群高出24.18%;经产母羊繁殖率为98.34%,比自然放牧群高出5.07%。整体上,标准化养殖提高了藏羊的体重稳定性、降低了死亡率,并显著提升了繁殖率,为当地畜牧业的可持续发展提供了科学依据和实践指导。

Instability of thermocapillary flow in liquid layers under microgravity

The instability of the thermocapillary flow in liquid layers is studied in the present paper using the linear stability analysis.Based on the two-dimensional steady flow state,the three-dimensional disturbance with a wave number in the spanwise direction is considered.The effects of the aspect ratio and free surface shape of the liquid layer on the flow instability are studied,and the results are compared with the case with the two-dimensional disturbance.