. Fig. 23—Section of ovary of cow showing a follicle ot 2 mm., with ovum. The female exhibits sexual desire only for a compara- tively brief time, during the existence of a ripe ovisac or ovisacs in the ovary. The duration of the estrual period varies widely, according to species. It is shortest in the cow, ranging ordinarily between eighteen and twenty-four hours, or a trifle longer. The mare is usually in estrum for several days. The bitch is in estrum for ten to fifteen days. In healthy females, the estrual cycle is quite uniform. In the cow it is twenty to twenty-two days, usually twenty-o
. Fig. 23—Section of ovary of cow showing a follicle ot 2 mm., with ovum. The female exhibits sexual desire only for a compara- tively brief time, during the existence of a ripe ovisac or ovisacs in the ovary. The duration of the estrual period varies widely, according to species. It is shortest in the cow, ranging ordinarily between eighteen and twenty-four hours, or a trifle longer. The mare is usually in estrum for several days. The bitch is in estrum for ten to fifteen days. In healthy females, the estrual cycle is quite uniform. In the cow it is twenty to twenty-two days, usually twenty-one; in the mare 3 to 4 weeks; in the bitch ordinarily every six months. The frequency, intensity, and duration of estrum are profoundly modified by the state of nutrition, diseases of the genital organs, and by serious systemic diseases.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecthorses, bookyear1921
