Table 1.
Cumulus–oocyte complexes (COCs) collected by ovum pick-up in Romosinuano (RM) and Tropical Milking (TM) cows in three seasons in Veracruz, Mexico.
| Variable | Season | |||
|---|---|---|---|---|
| Breed | Hot Dry | Hot Humid | Fresh Dry | Global |
| Total COCs | ||||
| RM | 29.6 ± 2.6 a | 22.6 ± 1.7 b | 29.1 ± 2.3 a | 26.9 ± 1.3 |
| TM | 18.9 ± 2.0 b | 28.4 ± 2.2 a | 26.6 ± 2.1 a | 24.2 ± 1.3 |
| Global | 23.6 ± 1.5 | 25.4 ± 1.4 | 27.8 ± 1.6 | |
| Viable | ||||
| RM | 17.3 ± 2.1 a | 12.8 ± 1.3 b | 18.7 ± 1.9 a | 16.1 ± 1.0 A |
| TM | 13.7 ± 1.8 ab | 17.4 ± 1.8 a | 8.0 ± 1.0 c | 12.4 ± 0.9 B |
| Global | 15.4 ± 1.2 | 14.9 ± 1.1 | 12.2 ± 1.0 | |
| Unviable | ||||
| RM | 1.7 ± 0.6 b | 1.7 ± 0.5 b | 1.8 ± 0.5 b | 1.8 ± 0.3 |
| TM | 0.4 ± 0.3 a | 3.0 ± 0.8 b | 1.5 ± 0.5 b | 1.2 ± 0.3 |
| Global | 0.9 ± 0.3 Z | 2.3 ± 0.4 XY | 1.7 ± 0.4 YZ | |
| Denuded | ||||
| RM | 9.4 ± 1.4 b | 7.5 ± 1.0 b | 8.3 ± 1.1 b | 8.4 ± 0.7 |
| TM | 4.2 ± 0.8 a | 6.0 ± 1.0 ab | 17.1 ± 2.2 c | 9.6 ± 0.7 |
| Global | 6.3 ± 0.7 X | 6.7 ± 0.7 X | 11.9 ± 1.1 Y | |
| Total matured in vitro | ||||
| RM | 27.8 ± 2.7 a | 24.6 ± 2.0 a | 22.9 ± 2.1 a | 25.0 ± 1.3 A |
| TM | 13.3 ± 1.5 c | 16.7 ± 1.5 bc | 20.0 ± 1.8 ab | 16.5 ± 1.0 B |
| Global | 19.3 ± 1.3 | 20.3 ± 1.2 | 21.4 ± 1.4 | |
A,B Different literal per row indicates statistical difference (p ≤ 0.01). X,Y,Z Different literal per column indicates statistical difference (p ≤ 0.006). a,b,c Different literal per column for season and row for breed indicates statistical difference (p ≤ 0.01).