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首页> 外文期刊>Tropical Animal Health and Production >Diurnal thermoregulatory responses in pregnant Yankasa ewes to the dry season in a tropical Savannah
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Diurnal thermoregulatory responses in pregnant Yankasa ewes to the dry season in a tropical Savannah

机译：怀孕的yankasa母羊在热带大草原的旱季昼夜温疗反应

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摘要

The study investigated concomitant effect of gestation and high ambient temperature under a tropical environment on rectal temperature (RT), respiratory rate (RR) and heart rate (HR) responses in Yankasa ewes. Twenty Yankasa ewes, consisting of ten pregnant and ten non-pregnant ewes, were used for the study. Ewes were synchronised and bred, such that each gestation phase coincided with different periods of the dry-seasons, early-gestation (cold/harmattan), mid-gestation (peak hot-dry) and late-gestation (late hot-dry). The RT, RR and HR were recorded thrice, 2 days apart at middle of each gestation period at 06:00, 14:00 and 18:00 h, concurrently with dry- (DBT) and wet-bulb temperatures of the experimental pen. The DBT was positively correlated with RT, RR during the different gestation stages. The RT significantly (P 0.001) increased with the hour of day, regardless of the physiological status of the ewes, with peak at 14:00 h. Values of RT and RR were higher (P 0.05) in pregnant than non-pregnant ewes at mid- and late-gestation, respectively. Mean RT was lower (P 0.001) at 06:00 h in pregnant than non-pregnant ewes at early-gestation (cold-dry). The HR was (P 0.05) higher in pregnant than non-pregnant ewes during the different gestation phases. In conclusion, ambient temperature and gestation concomitantly modulate diurnal thermoregulatory responses of the ewes to hot-dry season. Adequate measures should be adopted to mitigate adverse impact of prolonged high RR on the dam and the foetus during the peak of ambient temperature prevailing in the tropical Savannah environment.
机译：该研究在热带环境下伴随着妊娠和高环境温度的伴随效果，在yankasa ewes的直肠温度（RT），呼吸率（RR）和心率（HR）反应中的呼吸率（RR）和心率（HR）反应。由十个怀孕和十个非怀孕母羊组成的二十个yankasa母羊用于该研究。母羊同步并繁殖，使得每个妊娠相结合的干燥季节，早期妊娠（冷/疱疹），中妊娠（峰热干）和后期妊娠（晚热干燥）。 RT，RR和HR被记录到每次妊娠期中间的2天，在06:00，14：00和18:00 h，与实验笔的干燥（DBT）和湿灯泡温度相同时。在不同的妊娠期期间，DBT与RT呈正相关。 RT显着（p <0.001）随着时间的每天增加而增加，无论母羊的生理状态如何，达到14:00 h。在中期和后期妊娠的非怀孕母羊分别妊娠，RT和RR的值较高（P <0.05）。在早期妊娠（冷干）的非妊娠母羊，在06:00 H时，在06:00 h较低（p <0.001）。在不同妊娠期期间，HR在怀孕期间妊娠高于非妊娠EWE。总之，环境温度和妊娠伴随着调节母羊的昼夜热调节反应到热干燥季节。在热带大草原环境中普遍存在的环境温度达到峰值期间，应采取足够的措施来减轻延长的高压和胎儿的不利影响。

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