Abstract
The objectives of this study aimed to correlate environmental and donor management factors that may affect the production and the viability of the cumulus oocyte complexes (COCs) from zebu cows (N=205) in the tropics. A total of (N=5896) COCs were obtained by ovum-pick up (OPU) at different livestock facilities. The COCs were evaluated by stereoscopic microscopy and the dependent variables were: 1) total of COC recovered and 2) percentage of viable COCs. Environmental variables were as follows: Temperature-Humidity Index (THI, comfort, alert, danger and emergency); seasons by rainfall: dry (December-May) and rainy (June-November), and seasons by month. Management included; technological index (TI: low, medium, high), diet (grazing or grazing + supplementation), acclimation (<30, 30–90 and >90 days). One-way ANOVA, factorial and multivariate analysis were performed. THI in comfort and alert resulted in higher viability (68.86±2.00; 74.10±2.59) than danger and emergency indexes (62.40±2.01; 56.52±5.51; p<0.05). Additionally, during summer and winter COCs had lower numerical viability than those recovered in spring and fall 56.88±3.20; 61.07±2.25 vs., 67.90±2.19 ; 76.25±1.92, respectively. Further, high TI resulted in higher viability when compared to low and medium TI 35.54±5.16 vs., 27.31±1.72 and 28.20±1.84, respectively. Furthermore, Grazing cows receiving additional dietary supplementation improved viable COCs compared to grazing alone (30.96±1.77 vs 25.25±2.09; p<0.05). Acclimation had an effect on total COC production and, this was higher in <30 and 30-90 days than >90 37.62±5.24 and 32.65±2.45 vs., 24.21±1.50; respectively (p<0.05).
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