topcross

n.

顶交，公的良种与差的母畜的交配；

topcross:
TopCross High-Oil Corn Production
TopCross High-Oil Corn Production: Agronomic Performance
Topcross Versus S1 Line Performance in Corn(Zea mays L.)1
Pollinators for topcross® grain production
TopCross high oil corn production: Select grain quality attributes
Evaluation of landrace topcross hybrids of pearl millet for arid zone environments
Heterosis in landrace-based topcross hybrids of pearl millet across arid environments.
Mapping resistance to Southern rust in a tropical by temperate maize recombinant inbred topcross population
Genetic Variation and Predicted Gain from Selection for Winterhardiness and Turf Quality in a Perenial Ryegrass Topcross Population