Livestock Management RANCHING
Figure 1. Calf and weaning results from dam mineral supplementation Item
Birth Weight (lbs.)
Weaning weight (lbs.) Calf value ($)
205-day adjusted weaning weight (lbs.)
Calf value ($)
Preconditioned calf1 Calf value ($)
1 vaccinated and preconditioned for 45 days
Source: “Effects of Organic or Inorganic Co, Cu, Mn and Zn Supplementation to Late-gestating Beef Cows on Productive and Physiological Responses of the Offspring,” Oregon State University
Figure 2. Feedlot and slaughter results from dam trace mineral supplementation Growing lot
Treated for BRD (%) Ending weight (lbs.)
Treated for BRD (%) Ending weight (lbs.)
Hot carcass weight (lbs.) Choice (%)
42.3 774
Finishing lot 0.0
1,428 900
87.7% 5.2
1,459 920
97.1% 4.4
1,496 942
92.1%
Source: “Effects of Organic or Inorganic Co, Cu, Mn and Zn Supplementation to Late-gestating Beef Cows on Productive and Physiological Responses of the Offspring,” Oregon State University
Potential is stunning INR calves were 25 pounds heavier than CON calves
at weaning (Figure 1). The ORG calves were 53 pounds heavier that the control group and 28 pounds heavier than calves from dams receiving inorganic supple- mentation. Given the increased weaning weight, Cooke notes,
“Supplementing cows with organic trace minerals increased the weaning value of their calves by $70 per head compared to the control group, at a cost of $3.10 per cow. Calves from cows supplemented with inorganic trace minerals were worth $32 per head more than those in the control group, at a cost of $2 per cow.” Calves carried benefi ts beyond weaning, too. Calves
from dams supplemented with organic trace minerals were 68 pounds heavier than the control group when finished (Table 2), with a subsequent hot carcass weight 42 pounds heavier. The INR calves were 31 pounds heavier than the control group at fi nish, with 20 pounds more hot carcass weight.
66 The Cattleman November 2016 Between weaning and the feedlot, 22.3% fewer
ORG calves were treated for bovine respiratory disease (BRD) compared to the CON group, and 39.1% less than the INR group. Overall, according to the study, supplementation
of organic trace minerals appeared to enhance more effective transfer of trace elements from the dams to their calves. This is one study. But the promise shown by it, and
the number of producers who have previously seen no need to supplement trace minerals during gestation, suggest there could be huge opportunity for individual producers and the industry. “Results from this experiment are novel and suggest
that supplementing late-gestating beef cows with an organic complexed source of cobalt, copper, zinc and manganese, instead of no supplementation, may be an alternative to optimize offspring productivity in beef production systems,” Cooke says. But, he emphasizes, “First things fi rst. I think this only works when you’ve provided good nutrition to cows to begin with.”
thecattlemanmagazine.com
59.1 790
20.0 823
CON 92.6 466
$660 537
$757 539
$756
INR 91.5 491
$692 554
$781 561
$793
ORG 89.8 519
$730 579
$815 583
$822
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