Kiddy C A, Mitchell D S
J Dairy Sci. 1981 Feb;64(2):267-71. doi: 10.3168/jds.S0022-0302(81)82563-5.
One Catahoula Leopard Cowdog and three German Shepherd dogs, previously trained to detect odors characteristic of estrus in cows, were used in three experiments to determine when estrus-related odor first appears, how long it persists, and when it disappears in relation to time of estrus. Samples were swabs of reproductive tract fluids taken from vaginas of cycling cows on the day of estrus, at diestrus (8 to 10 days after estrus), and at daily intervals before and after estrus. Estrous odor emerges slowly during the 3 days before estrus, reaches a definite peak in intensity on the day of estrus, and disappears within 1 day thereafter.
一只卡塔胡拉豹犬和三只德国牧羊犬，之前经过训练能够检测母牛发情期的特征气味，在三项实验中被用于确定发情相关气味首次出现的时间、持续时长以及相对于发情时间何时消失。样本是从处于发情期、发情后期（发情后8至10天）以及发情前后每天从处于发情周期的母牛阴道采集的生殖道液体拭子。发情气味在发情前3天缓慢出现，在发情当天强度达到确定峰值，并在之后1天内消失。
