Al-Bukhari narrated that Rashid bin Saad said: The predecessors used to like the male horse; Because it is bolder and easier.
Al-Hafiz said in “Al-Fath”: And his saying: bolder and easier, with a pronounciation “daring” than boldness, and without provocation than running, and bolder with gymnastics than boldness, and he omitted the preferred over it just for the context, that is, from the female or the castrated.
And Abu Ubaidah narrated in the book “The Horses” on the authority of Abdullah bin Muhairiz similar to this trail, and added: They used to like female horses in raids and nights. Al-Walid bin Muslim narrated in “Al-Jihad” to him through Ubadah bin Nasi and Ibn Muhairiz that they used to like female horses in raids and nights, and when matters of war were hidden, and they preferred stallions in ranks and forts, and when matters of war appeared.
It was narrated on the authority of Khalid ibn al-Walid that he used to fight only over a female; Because it pushes urine, and it is less neighing, and the stallion holds it in its running until it ruptures and hurts with its neighing.