Table 2.
Body composition, reproductive parameters, and age of cows at study initiation (day −30) and pregnancy rate at day 28 of gestation
| Item | TRT1 | CNT2 | SEM | P-value |
|---|---|---|---|---|
| N | 34 | 34 | -- | -- |
| BW, kg | 622.18 | 628.91 | 16.29 | 0.75 |
| BCS | 5.85 | 5.83 | 0.16 | 0.94 |
| Rib fat3, cm | 0.98 | 0.93 | 0.05 | 0.71 |
| Rump fat3, cm | 1.49 | 1.32 | 0.13 | 0.34 |
| Day postpartum | 93.97 | 94.73 | 1.02 | 0.60 |
| Age, years | 4.47 | 4.88 | 0.47 | 0.54 |
| Pregnancy rate, % | 64.71 (22/34) | 52.9 (18/34) | -- | -- |
TRT = treatment; cow–calf pairs were provided with ad libitum access to a weekly 1.16 kg of DM × cow–calf pair−1-allotment of a custom-formulated and contractually-manufactured complete free-choice mineral supplement that contained amino acid complexes of Zn, Cu, and Mn, as well as Co glucoheptonate beginning on day −30.
CNT = control; cow–calf pairs were provided with ad libitum access to a weekly 1.16 kg of DM × cow–calf pair−1-allotment of a custom-formulated and contractually-manufactured complete free-choice mineral supplement that contained a similar level of Zn, Cu, Mn, and Co from inorganic sources beginning on day −30.
Rib fat and rump fat were estimated via transdermal ultrasonography.