J. Anim Sci.
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Journal of Animal Science, Vol 68, Issue 8 2380-2386, Copyright © 1990 by American Society of Animal Science

JOURNAL ARTICLE

Performance, carcass, cartilage calcium, sensory and collagen traits of longissimus muscles of open versus 30-month-old heifers that produced one calf

A. W. Waggoner, M. E. Dikeman, J. R. Brethour and K. E. Kemp
Kansas State University, Manhattan 66506.

One hundred eleven Simmental x Hereford (3/8 to 5/8 Simmental) heifers were used to determine the effects of age, parturition and implantation on performance, carcass and meat-sensory traits, muscle-collagen characteristics and thoracic-button calcification. Eighty-five heifers that calved at about 2 yr of age, designated as single-calf heifers (SCH), were either implanted (I-SCH) with Synovex-H or not implanted (NI-SCH). The remaining 26, 2-yr-old non-pregnant heifers (2-OH) served as controls. Additionally, 24, 1-yr-old open heifers (1-OH) from the same genetic source were utilized as the standard heifer-production system. The 1-OH and 2-OH were slaughtered after being fed a high-grain diet for 137 and 112 d, respectively. The SCH were fed the same high-grain diet beginning about 1 mo after calving and were fed 137 d before slaughter. The 33 I-SCH were implanted when started on the high-grain diet. Calves were weaned about 5 wk before the SCH were slaughtered. The 2-OH had the highest (P less than .05) feedlot ADG, whereas no differences (P greater than .05) occurred among other treatments. Dressing percentages were higher (P less than .01) for I-SCH than for NI-SCH. Carcass weights were lowest (P less than .05) and percentage kidney, pelvic and heart fat was highest (P less than .01) for 1-OH. Fat thickness, yield grades, marbling scores and quality grades were similar (P greater than .05) and desirable for all treatments.(ABSTRACT TRUNCATED AT 250 WORDS)


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B. A. Reiling and D. D. Johnson
Effects of implant regimens (trenbolone acetate-estradiol administered alone or in combination with zeranol) and vitamin D3 on fresh beef color and quality
J Anim Sci, January 1, 2003; 81(1): 135 - 142.
[Abstract] [Full Text] [PDF]


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Copyright © 1990 by the American Society of Animal Science.