• Beef production from native and seeded Northern Great Plains ranges

      Adams, Don C.; Staigmiller, Robert B.; Knapp, Bradford W. (Society for Range Management, 1989-05-01)
      Multiparous crossbred cows (N=355) were studied over 4 years to evaluate effects of native range (NR) and seeded range on cow reproduction and performance during prebreeding from parturition to the start of breeding and during a 45-day breeding period. Treatments for prebreeding were: (1) NR and (2) crested wheatgrass (CW; Agropyron desertorum Fisch. ex [Link] Schult.) and during breeding: (1) NR, (2) Russian wildrye (RWR; Psathrostachys juncea [Fisch.] Nevski) and (3) contour furrowed NR (CF) interseeded with 'Ladak' alfalfa (Medicago Sativa L.). After breeding (postbreeding), all cows grazed NR to weaning in 3 of the 4 years. In year 4, calves were weaned at the end of breeding because of severe drought. Treatments and years were arranged as a factorial. Cow reproduction was evaluated by date of calving, the number of cows in estrus at least once before the beginning of breeding, and fall pregnancy rate. Prebreeding, breeding, and year effects as well as all interactions were nonsignificant (P>0.05) for all reproductive traits. Milk production and milk composition were not affected by prebreeding or breeding treatments. Differences in cow and calf weight gains occurred between prebreeding treatments and generally favored CW. Small differences also occurred in cow weight gains between breeding treatments. All cows gained weight and body condition during prebreeding and breeding and then lost weight and condition postbreeding. Breeding treatment effects on calf gains were small. We concluded that the primary benefits of seeded ranges in the Northern Great Plains are comparable to those documented for increased stocking rate and improved forage management. Seeded ranges did not improve individual animal performance.
    • Effects of Weaning Date and Prepartum Protein Supplementation on Cow Performance and Calf Growth

      Stalker, L. Aaron; Ciminski, Lane A.; Adams, Don C.; Klopfenstein, Terry J.; Clark, Richard T. (Society for Range Management, 2007-11-01)
      Two experiments evaluated effects of weaning date on cow body condition score (BCS) and calf growth. In Experiment 1, 134 March-calving cows were used in a four-year experiment. Calves were weaned 18 August or 7 November and cows were fed 0 or 0.45 kg protein supplement (42% crude protein) three days per week from 1 December to 28 February while grazing upland range in a 2 by 2 factorial arrangement of treatments. In Experiment 2, spring calving cows (year 1, n = 97; year 2, n = 104) were assigned randomly to one of eight weaning dates at 2-week intervals from 19 August to 25 November. In Experiment 1, weaning in August increased cow BCS precalving (P < 0.001) and prebreeding (P < 0.001), but not pregnancy rates (P = 0.56). Cows fed supplemental protein had greater BCS precalving (P<0.001) and prebreeding (P=0.001) than nonsupplemented cows, but pregnancy rates were similar (P=0.27). Calves born to cows fed supplemental protein prepartum had greater weaning weight than calves born to nonsupplemented cows regardless of whether weaning occurred in August (P = 0.001) or November (P < 0.001). Effects of weaning date on feedlot performance interacted with supplementation treatment. Calves born to cows fed supplement that were weaned in November generated the greatest net returns. In Experiment 2, BCS decreased linearly (P<0.001) as date of weaning was delayed from August to November. Nursing calf gain increased cubically (P < 0.0004) and weaned calf gain from August to November increased quadratically (P < 0.002). Protein supplementation did not affect cow pregnancy rate, but calves born to cows fed protein supplement had greater pre- and postweaning gains. Cow BCS decreased as weaning date was moved later in the year but cow pregnancy rate was not affected by weaning date. 
    • Getting the Most Out of Grain Supplements

      Adams, Don C. (Society for Range Management, 1986-02-01)
    • Matching the Cow with Forage Resources

      Adams, Don C.; Clark, Richard T.; Klopfenstein, Terry J.; Volesky, Jerry D. (Society for Range Management, 1996-04-01)
    • Research and education for managing resources within the Nebraska Sandhills: The Gudmundsen Sandhills Laboratory

      Adams, Don C.; Clark, Richard T.; Reece, P. E.; Volesky, Jerry D. (Society for Range Management, 1998-10-01)