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... .Cereal grasses with small flowers (millet, foxtail millet) are castrated thermally: the heads are immersed in hot water (45°-50°C) for four to five minutes to render the pollen inviable.

... or male sexual cells become inviable as a result of illness or of metabolic disturbances which have a negative effect on the formation of sexual cells and on the development of the already fertilized female sexual cell (the zygote). Inflammatory processes in the fetal membranes or in the tissues of the fetal sac may also cause abortions. Idiopathic infectious ...