| 英文描述 | Silent heats are common and normal during the first few cycles postpartum in cattle and the frequency of silent heats decreases with succeeding cycles. Very cold or very hot weather will decrease estrus activity. Mares have been studied that ovulated at regular cycles but failed to show outward signs of estrus; this could lead to a mistaken diagnosis of pregnancy in a mare that was cycling. Silent estrus has been described in bitches and queens. Both young and mature queens might have heats which go unnoticed unless they are placed with a breeding male. |
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