Aarif O, Aggarwal A, Sheikh A A
Animal Physiology Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India.
Reprod Domest Anim. 2018 Feb;53(1):249-255. doi: 10.1111/rda.13100. Epub 2017 Nov 7.
Evaporative cooling during late gestation period improves post-partum reproductive performance in Murrah buffaloes. To prove this hypothesis, sixteen pregnant dry Murrah buffaloes at sixty days pre-partum were selected and divided into two groups of eight animals each. Group 1 of buffaloes (Cooled/CL) was managed under fan and mist cooling during dry period, whereas second group of buffaloes (non-cooled/NCL) remained without the provision of cooling. After parturition, all the animals were managed under evaporative cooling till the end of experimental period. Reproductive performance in cooled (CL) and non-cooled (NCL) groups, respectively, viz. 1st and 2nd ovulation from calving (48.63 ± 2.41, 69.25 ± 2.34 days and 57.75 ± 3.35, 93.63 ± 2.84 days); calving to conception interval (117.88 ± 4.21 days and 117.88± 4.21 days); conception rate (87.5% ± 2.16% and 57% ± 2.26%); and follicular diameter at the time of 1st and 2nd ovulation (14.84 ± 0.16, 15.75 ± 0.13 mm and 12.65 ± 0.13, 13.35 ± 0.11 mm) varied significantly (p < .05). Total peak oestrogen concentration was significantly (p < .05) higher in cooled (26.7 ± 1.32 pg/ml) relative to non-cooled (20.7 ± 1.22 pg/ml) buffaloes. Time from onset of oestrus to ovulation varied significantly (p < .05) in cooled (32 ± 2.22 hr) and non-cooled (40 ± 2.86 hr) buffaloes. The peak progesterone concentration reached to (4.25 ng/ml) in cooled group and (4.16 ng/ml) in non-cooled group after first ovulation.
妊娠后期进行蒸发冷却可提高摩拉水牛产后的繁殖性能。为了验证这一假设，选取了16头怀孕的干奶期摩拉水牛，在产前60天，将它们分为两组，每组8头。第一组水牛（冷却组/CL）在干奶期采用风扇和喷雾冷却管理，而第二组水牛（非冷却组/NCL）则不提供冷却措施。分娩后，所有动物在蒸发冷却条件下管理直至实验期结束。冷却组（CL）和非冷却组（NCL）的繁殖性能，即产后第一次和第二次排卵时间（分别为48.63±2.41、69.25±2.34天和57.75±3.35、93.63±2.84天）；产犊至受孕间隔时间（117.88±4.21天和117.88±4.21天）；受孕率（87.5%±2.16%和57%±2.26%）；以及第一次和第二次排卵时的卵泡直径（14.84±0.16、15.75±0.13毫米和12.65±0.13、13.35±0.11毫米）均有显著差异（p<0.05）。冷却组水牛（26.7±1.32 pg/ml）的总雌激素峰值浓度显著高于非冷却组（20.7±1.22 pg/ml）（p<0.05）。冷却组（32±2.22小时）和非冷却组（40±2.86小时）水牛从发情开始到排卵的时间有显著差异（p<0.05）。第一次排卵后，冷却组孕酮峰值浓度达到4.25 ng/ml，非冷却组为4.16 ng/ml。
