Skip to main content
. 2021 Nov 16;5(4):txab218. doi: 10.1093/tas/txab218

Table 2.

The effects of implanta and zinc sourceb on performance measures in finishing feedlot steers

Implant treatments NoIMP IS/200 SEM P-values
Zinc treatments ZnB ZnG ZnS ZnB ZnG ZnS IMP Zn IMP × Zn
Steer (n)c 12 11 12 12 12 12
Body weight, kg
 d 0 411 411 409 410 412 412 3.1 0.70 0.96 0.80
 d 28 462 461 452 459 469 465 4.0 0.08 0.22 0.11
 d 57 508 506 497 511 520 522 5.1 <0.001 0.74 0.11
 d 84 542yz 538yz 536z 555xy 567wx 575w 6.3 <0.001 0.48 0.10
 d 112 586z 579z 581z 611y 622xy 637x 7.3 <0.001 0.30 0.10
 d 126 603z 594z 591z 630y 639xy 654x 7.8 <0.001 0.62 0.07
Average daily gain, kg
 d 0–56 1.70yz 1.65yz 1.55z 1.77xy 1.90x 1.91x 0.069 <0.001 0.75 0.08
 d 57–126 1.38 1.28 1.37 1.72 1.72 1.91 0.070 <0.001 0.12 0.32
Dry matter intake, kg
 d 0–56 10.5 10.6 9.8 10.5 10.8 10.4 0.28 0.23 0.08 0.55
 d 57–126 10.4 10.5 10.3 10.9 11.0 11.5 0.36 0.01 0.84 0.45
Zn intake, mg/d
 d 0–56 1367 1295 1310 1367 1321 1398 37.2 0.20 0.24 0.45
 d 57–126 1361 1294 1383 1419 1353 1549 46.9 0.01 0.01 0.40
G:Fd
 d 0–56 0.161 0.147 0.174 0.200 0.194 0.228 0.0093 <0.001 0.01 0.70
 d 57–126 0.132 0.121 0.133 0.160 0.156 0.169 0.0072 <0.001 0.19 0.83
Overall performance
 ADGe, kg 1.49z 1.41z 1.38z 1.69y 1.74xy 1.84x 0.060 <0.0001 0.53 0.07
 DMI, kg 10.5 10.6 10.1 10.7 10.9 11.0 0.30 0.03 0.74 0.45
 G:F 0.15 0.14 0.15 0.16 0.17 0.18 0.005 <0.0001 0.13 0.36
Carcass-adjusted performancef
 Final BW, kg 598 590 590 635 637 660 8.7 <0.0001 0.33 0.12
 ADG, kg 1.48 1.42 1.44 1.79 1.79 1.98 0.062 <0.0001 0.21 0.12
 G:F 0.14 0.13 0.14 0.17 0.16 0.18 0.005 <0.0001 0.02 0.49

a Implant strategies included no implant (NoIMP) or a Component TE-IS (IS/200; 80 mg trenbolone acetate + 16 mg estradiol; Elanco Animal Health, Greenfield, IN) on day 0 followed by a Component TE-200 (200 mg trenbolone acetate + 20 mg estradiol; Elanco Animal Health) on day 57.

b Cattle received 70 mg Zn/kg DM from ZnSO4 + 30 mg Zn/kg DM from basic ZnCl, Zn glycinate, or ZnSO4 (ZnB, ZnG, or ZnS, respectively). Total Zn supplementation was targeted at 100 mg Zn/kg DM to meet industry consultant recommendations (Samuelson et al., 2016).

c Unlike superscripts represent tendencies for differences between treatment means (0.05 < P ≤ 0.10).

d Feed efficiency.

e Average daily gain was analyzed as repeated measures with the repeated effect of Day. Zn × Day P = 0.01; IMP × Day P = 0.02; Day P < 0.0001; Zn × IMP × Day P = 0.86.

f Carcass-adjusted performance was calculated using the average dressing percent: 64.35%.