| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
* USDA-ARS, Fort Keogh Livestock and Range Research Laboratory, Miles City, MT 59301;
and
Animal Sciences Department, University of Missouri, Columbia 65211; and
and
Animal and Range Sciences Department, Montana State University, Bozeman 59717
2 Correspondence:
phone (406) 232-8215; fax (406) 232-8209; E-mail:
tom{at}larrl.ars.usda.gov.
Our objective was to determine if serum concentrations of leptin could be used to predict carcass composition and merit in feedlot finished cattle. Two different groups of crossbred Bos taurus steers and heifers were managed under feedlot conditions near Miles City, MT. The first group consisted of 88 1/2 Red Angus, 1/4 Charolais, and 1/4 Tarentaise composite gene combination steers (CGC) harvested at the ConAgra processing facility in Greeley, CO. The second group (Lean Beef Project; LB) consisted of 91 F2 steers and heifers born to Limousin, Hereford, or Piedmontese by CGC F1 cows crossed to F1 bulls of similar breed composition and harvested at a local processing facility in Miles City, MT. Blood samples were collected approximately 24 h before harvest (CGC) or approximately 3 d before and at harvest (LB). No differences in serum concentrations of leptin were detected (P > 0.10) between Hereford, Limousin, or Piedmontese F2 calves nor between LB steers and heifers. Positive correlations (P < 0.01) existed between serum leptin and marbling score (r = 0.35 and 0.50), fat depth measured between the 12th and 13th rib (r = 0.34 and 0.46), kidney, pelvic, and heart fat (KPH) (r = 0.42 and 0.46), and quality grade (r = 0.36 and 0.49) in CGC and LB cattle, respectively. Serum leptin was also positively correlated with calculated yield grade for CGC steers (r = 0.19; P = 0.10) and LB cattle (r = 0.52; P < 0.01). Longissimus area was not correlated with serum leptin in CGC steers (r = 0.12; P > 0.10). However, a negative correlation existed between longissimus area and serum leptin in the LB cattle (r = -0.45; P < 0.01). Serum concentrations of leptin were significantly associated with carcass composition (marbling, back fat depth, and KPH fat) and quality grade in both groups of cattle studied and may provide an additional indicator of fat content in feedlot cattle.
Key Words: Carcass Composition • Cattle • Fat • Leptin • Lipid
This article has been cited by other articles:
|
|
 |
|
  W. Steeneveld, H. Hogeveen, H. W. Barkema, J. van den Broek, and R. B. M. Huirne The Influence of Cow Factors on the Incidence of Clinical Mastitis in Dairy Cows J Dairy Sci, April 1, 2008; 91(4): 1391 - 1402. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. M. B. Vendramini, L. E. Sollenberger, A. T. Adesogan, J. C. B. Dubeux Jr., S. M. Interrante, R. L. Stewart Jr., and J. D. Arthington Protein Fractions of Tifton 85 and Rye-Ryegrass Due to Sward Management Practices Agron. J., February 29, 2008; 100(2): 463 - 469. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. D. Nkrumah, D. H. Keisler, D. H. Crews Jr., J. A. Basarab, Z. Wang, C. Li, M. A. Price, E. K. Okine, and S. S. Moore Genetic and phenotypic relationships of serum leptin concentration with performance, efficiency of gain, and carcass merit of feedlot cattle J Anim Sci, September 1, 2007; 85(9): 2147 - 2155. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. L. Lusk Association of single nucleotide polymorphisms in the leptin gene with body weight and backfat growth curve parameters for beef cattle J Anim Sci, August 1, 2007; 85(8): 1865 - 1872. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Sandrucci, A. Tamburini, L. Bava, and M. Zucali Factors Affecting Milk Flow Traits in Dairy Cows: Results of a Field Study J Dairy Sci, March 1, 2007; 90(3): 1159 - 1167. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. M. B. Vendramini, L. E. Sollenberger, J. C. B. Dubeux Jr., S. M. Interrante, R. L. Stewart Jr., and J. D. Arthington Concentrate Supplementation Effects on the Performance of Early Weaned Calves Grazing Tifton 85 Bermudagrass Agron. J., February 6, 2007; 99(2): 399 - 404. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. M. Brandt, D. H. Keisler, D. L. Meyer, T. B. Schmidt, and E. P. Berg Serum hormone concentrations relative to carcass composition of a random allotment of commercial-fed beef cattle J Anim Sci, January 1, 2007; 85(1): 267 - 275. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P. J. Kononoff, H. M. Deobald, E. L. Stewart, A. D. Laycock, and F. L. S. Marquess The effect of a leptin single nucleotide polymorphism on quality grade, yield grade, and carcass weight of beef cattle J Anim Sci, April 1, 2005; 83(4): 927 - 932. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. P. Berg, E. L. McFadin, K. R. Maddock, R. N. Goodwin, T. J. Baas, and D. H. Keisler Serum concentrations of leptin in six genetic lines of swine and relationship with growth and carcass characteristics J Anim Sci, January 1, 2003; 81(1): 167 - 171. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
