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Evaporative cooling in late gestation heat-stressed Murrah buffaloes increases efficiency of next reproductive cycle.
Reproduction in Domestic Animals 2018 Februrary
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.
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