EurekaMag.com logo
+ Site Statistics
References:
53,214,146
Abstracts:
29,074,682
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Injectable copper and zinc for grazing yearling steers



Injectable copper and zinc for grazing yearling steers



Canadian Journal of Animal Science 67(4): 1033-1042



Injectable Cu and Zn were evaluated as mineral supplements using 37 purebred Herefords (Group 1) and 23 Angus-Charolais-North Devon crosses (Group 2). The 60 steers were carried through a 113-d grazing phase. This was followed by a 79-d finding phase for all steers of Group 1 and seven steers of Group 2. Treatments were combinations of the non-dosing (0Cu, 0Zn) and dosing (+Cu, +Zn) of steers with injectable Cu or Zn at the start of the grazing phase: (1) 0Cu, 0Zn; (2) +Cu, 0Zn; (3) 0Cu, +Zn; and (4) +Cu, +Zn. Injectables were the sole source of supplementary Cu and Zn during grazing and finishing phases. Means (SE) for Cu and Zn, respectively, in forages as milligrams per kilogram dry matter (DM) during the grazing phase were: grasses, 4.4 (0.17), 15.7 (0.46); alfalfa, 6.9 (0.18), 16.5 (1.49); and birdsfoot trefoil 5.0 (0.76), 15.0 (3.41). Injectable Cu did not influence (P > 0.05) body weight during the grazing phase. Body weight responses were lower (P < 0.05) for +Cu steers in the finishing phase, when dietary Cu was low, but steers could not be classified as Cu-deficient based on liver Cu. Liver Cu increased to means greater than 140 mg kg-1 DM in all steers, but was higher (P < 0.05) in +Cu steers during the grazing phase. Serum Cu varied widely during the grazing phase, but was higher (P < 0.05) for +Cu steers only on day 84 of the grazing phase. Neither liver Cu nor serum Cu was influenced (P > 0.05) by injectable Zn. Injectable Zn decreased growth rates in the latter part of the grazing phase but did not affect (P < 0.05) the body weight response during the finishing phase. The concentrations of Zn in liver and serum were not influenced (P > 0.05) by injectable Cu or Zn.

(PDF 0-2 workdays service: $29.90)

Accession: 001619966

Download citation: RISBibTeXText



Related references

Injectable copper copper oxide and zinc zinc metal for grazing yearling steers. Canadian Journal Of Animal Science: 1088, 1984

Comparison of the copper and molybdenum status of yearling steers grazing reclaimed mined-land and native range. Journal of Range Management 43(1): 69-72, 1990

Effect of molasses supplementation and copper cobalt and anti helminthic therapy on weight gain of beef yearling steers grazing improved pastures in a wet tropical environment. Australian Journal of Experimental Agriculture and Animal Husbandry 17(87): 538-544, 1977

Supplementation with injectable zinc copper and selenium and the effects on average daily gain and plasma levels of weaned steers. Journal of Animal Science 67(SUPPL 2): 211, 1989

Short duration grazing systems for yearling steers grazing fungal infected tall fescue pastures. Journal of Animal Science 65(SUPPL 1): 332, 1987

Forage intake and grazing times of yearling beef steers grazing nitrogen fertilizer russian wildrye psathyrostachys junceus. Canadian Journal of Animal Science 72(2): 375-387, 1992

Effect of time of supplementation on performance, forage intake and grazing behavior of yearling beef steers grazing Russian wild ryegrass in the fall. Journal of Animal Science 61(5): 1037-1042, 1985

Evaluation of Kentucky 31, G1-306, G1-307 and Kenhy tall fescue as pasture for yearling steers. 2. Growth, physiological response and plasma constituents of yearling steers. Journal of Animal Science 48(3): 618-623, 1979

Implant comparisons for grazing yearling steers. Report of progress Kansas Agricultural Experiment Station Kansas State College of Agriculture and Applied Science: (470) 12-13, 1985

Rumensin, protein for yearling grazing steers. MP University of Nebraska Agricultural Experiment Station: 2) 54-56, 1987

Evaluation of kentucky 31 g 1 306 g 1 307 and kenhy tall fescue as pasture for yearling steers part 2 growth physiological response and plasma constituents of yearling steers. Journal of Animal Science 48(3): 618-623, 1979

Summer grazing of yearling steers on coastal Bermudagrass. 1973

Performance of yearling steers on four pasture grazing systems. Research Report, Agricultural Experiment Station, University of Michigan (444): 232-241, 1983