Document Type
Thesis - University Access Only
Award Date
1994
Degree Name
Master of Science (MS)
Department / School
Animal Science
First Advisor
Robbi H. Pritchard
Abstract
The effects of compensatory growth on accretion of muscle mass, protein mass and nuclei number of the supraspinatus and semitendinosus muscles were evaluated using 7 serial slaughter groups of Angus x Limousin heifer calves (n = 28, BW 270 ± 9.5 kg). Fractional growth rates of carcass protein and fat were also evaluated. To achieve compensatory growth, energy intake was restricted for 88 days (Phase 1) followed by ad libitum feeding of a high energy diet (Phase 2) [LH). Controls were allowed continuous ad libitum access to the high energy diet (HH). Muscle weights, body composition samples, and muscle biopsies were collected at various _weight (465 vs 500 kg), or age (89 vs 186 days) constants. Phase 1 energy restriction limited body weight, carcass weight, carcass protein mass, and carcass fat mass (P < .05). This was the result of the limited tissue fractional growth rates. Phase 2 realimentation increased daily gains, gain efficiency, and the amount of ME available for gain. The fractional growth rate of protein for heifers exhibiting compensatory growth was not increased, but was maintained until maximum carcass protein mass was attained. Maximum carcass protein mass was attained by a weight of 465 kg. Any further increase in carcass weight was primarily attributed to an increase of carcass fat mass, regardless of previous management. Energy restriction limited muscle, protein, and nuclei accretion rates. Heifers exhibiting compensatory growth sustained a linear growth potential until maximum muscle mass occurred at an end point similar to cattle not exhibiting compensatory growth. Muscle nuclei maintained a constant relationship to muscle mass independent of nutritional treatment, muscle type (supraspinatus vs semitendinosus), or days on feed. These data suggest that the improvements of production and biological efficiencies during compensatory growth are due to sustaining rather than increasing of potential growth curve.
Library of Congress Subject Headings
Heifers -- Growth
Heifers -- Composition
Muscle proteins
Publisher
South Dakota State University
Recommended Citation
Alderson, Curtis L., "Effects of Growth Pattern on Muscle Protein and DNA Accretion, and Body Composition of Yearling Heifers" (1994). Electronic Theses and Dissertations. 1904.
https://openprairie.sdstate.edu/etd2/1904
Rights Statement
