Objective: To evaluate the effect of two implants that have different lengths of effective use on stocker cattle gains within an intensive early double-stocked native tallgrass prairie grazing system
Study description: Stocker steers (n = 281) were implanted with Revalor-G (Merck Animal Health, Madison, NJ) or Synovex One Grass (Zoetis, Inc., Kalamazoo, MI) and grazed on tallgrass native range for 90 days during the summer. The steers were individually weighed, after an overnight shrink, on the day of implanting, at midpoint of grazing, and the end of the grazing period. Total gains and average daily gain were evaluated.
|Item||Revalor-G1||Synovex One Grass2||Standard error of the mean||P – value|
|Season long grazing|
|Initial weight (day 0), lb||554||567||6.0||0.10|
|Midpoint weight (day 44), lb||666||666||3.7||0.42|
|Final weight (day 91), lb||781||782||7.7||0.77|
|Average daily gain, lb||2.6||2.5||0.04||0.35|
|Body weight gain, lb||223||221||5.1||0.65|
|Gain from beginning of grazing through midpoint (day 0-44)|
|Average daily gain, lb||2.5||2.6||0.10||0.45|
|Body weight gain, lb||106||108||3.7||0.58|
|Gain from midpoint through end of grazing period (day 45 – 91)|
|Average daily gain, lb||2.6||2.5||0.10||0.47|
|Body weight gain, lb||119||115||3.1||0.48|
|1Merck Animal Health (Madison, NJ) implant treatment.
2Zoetis, Inc. (Kalamazoo, MI) implant treatment.
The Bottom Line: Cattle performance was similar regardless of hormone amount and coating technology for these implants when used during a short duration grazing period with stocker steers.
View full research report by authors J. K. Farney and M. E. Corrigan at https://newprairiepress.org/kaesrr/vol5/iss1/.