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首页> 外文期刊>Agrociencia >Artificial long days induce anoestrus in Pelibuey ewes with continuous reproductive activity
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Artificial long days induce anoestrus in Pelibuey ewes with continuous reproductive activity

机译：人工漫长的日子在Pelibuey母羊中诱导具有连续生殖活动的花粉症

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摘要

Sheep from the tropical latitudes such as Pelibuey, can ovulate continuously, but it is unknown whether this activity continues at higher latitudes. Continuous Pelibuey sheep (group 1, n=15) and seasonal (group 2, n=15) were exposed to an inhibitory photoperiod (16 h L/8 h D), similar to high latitudes (56 degrees ) for 90 days (December 21 2002 to March 21 2003), using a controlled light chamber. Ovarian activity was evaluated with plasmatic progesterone concentration in samples taken twice a week, beginning one week before application of the photoperiod up to two months after concluding the treatment. The number of days of ovulatory activity (t test) and the percentage of females with ovulatory activity ( chi 2) of the two groups were compared. The ewes of the continuous group maintained their activity for 75.5 + 11.8 d and the seasonal group for 73.3 + 13.6 d (p>0.05). Anoestrus occurred in 60% of the females in the continuous group and 66.6% in the seasonal group (p>0.05). It is concluded that Pelibuey ewes selected as continuous are not sensitive to changes in photoperiod at 19 degrees N latitude. However, exposing them to a longer photoperiod activates the neuroendocrine mechanism that controls seasonal anoestrus..
机译：来自热带纬度地区（例如Pelibuey）的绵羊可以连续排卵，但是尚不清楚这种活动是否会在较高的纬度继续进行。将连续的Pelibuey绵羊（第1组，n = 15）和季节性（第2组，n = 15）暴露于抑制性光周期（16小时L / 8小时D），类似于高纬度（56度），持续90天（12月） 21 2002年3月21日）。从应用光周期前一周到结束治疗后两个月，每周两次抽取血浆样品中的孕激素浓度评估卵巢活性。比较两组的排卵活动天数（t检验）和具有排卵活动的女性百分比（chi 2）。连续组的母羊保持活性75.5±11.8 d，季节性组的母羊保持73.3±13.6 d（p> 0.05）。连续组中有60％的女性发生了发情期，而季节性组中有66.6％的患者出现了发情期（p> 0.05）。结论是，选定为连续的Pelibuey母羊对北纬19度的光周期变化不敏感。但是，将它们暴露在更长的光周期中会激活控制内分泌旺季的神经内分泌机制。

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