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- Title
Influence of supplemental copper, manganese, and zinc source on reproduction, mineral status, and performance in a grazing beef cow-calf herd over a two-year period.
- Authors
Jalali, S.; Lippolis, K.; Ahola, J. K.; Wagner, J. J.; Sellins, K.; Laudert, S. B.; Heldt, J. S.; Spears, J.; Engle, T. E.
- Abstract
The objective of this experiment was to evaluate the effects of supplemental Cu, Mn, and Zn source on reproduction, trace mineral (TM) status, and performance in a grazing cow-calf herd in eastern Colorado over a 2-yr period. Crossbred (Angus and Angus × Hereford; n = 261) 3-yr-old beef cows were stratified by expected calving date, BW, BCS, and liver TM status and randomly assigned to 1 of 6 pastures. Pastures were then assigned to 1 of 2 free-choice mineral treatments (n = 40-45 cows per pasture; experimental unit = pasture), resulting in 3 replicate pastures per treatment for each year of the 2-yr experiment. Treatments consisted of 1) hydroxychloride TM (HTM; 100% of the Cu, Mn, and Zn from IntelliBond C, M, and Z, respectively) and 2) inorganic + organic TM (IOTM; 75% of Cu, Mn, and Zn from sulfate TM and 25% of Cu, Mn, and Zn from AA complexes of Cu, Mn, and Zn). Replicates were rotated among pastures approximately every 28 d in order to minimize pasture effects. Free-choice mineral feeders were used to continuously provide current NRC-recommended concentrations of Cu, Mn, and Zn for 2 yr. Blood samples and liver biopsies were obtained from every cow before the initiation of the experiment and then from a subgroup of animals (20 random animals/replicate) at the end of yr 1 and the same 20 animals/replicate at the end of yr 2. At the end of yr 1, liver Cu and Zn concentrations were greater (P < 0.05) in HTM-supplemented cows compared with IOTM-supplemented cows. At the end of yr 2, liver Cu concentrations were greater (P < 0.05) and Zn concentrations tended (P < 0.06) to be greater in HTM-supplemented cows compared with IOTM-supplemented cows. However, over the 2-yr experiment, mineral intake, BW, BCS, pregnancy rate to AI, overall pregnancy rate, 205-d adjusted weaning weight, kilograms of calf weaned per cow exposed, and plasma Cu, Mn, and Zn concentrations were similar across treatments. These data indicate that under conditions of this experiment, source of TM had no impact on beef cattle production parameters but TM source did impact liver Cu and Zn concentrations over the 2-yr experiment.
- Subjects
COW-calf system; BEEF cattle reproduction; MANGANESE in animal nutrition
- Publication
Journal of Animal Science, 2017, Vol 95, p47
- ISSN
0021-8812
- Publication type
Abstract
- DOI
10.2527/asasann.2017.095