Carcass, sensory, and adipose tissue traits of Brangus steers fed casein-formaldehyde-protected starch and(or) lipid /
Eighteen 15-mo-old Brangus steers were assigned randomly to one of three dietary treatment groups: cracked corn (Corn), casein-formaldehyde-protected Canola Lipid (CL), or casein-formaldehyde-protected Marble Plus (MP). All diets were equally balanced for ME (2.91 Mcal/kg), CP (12.5%), and DM (89%)...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
2002.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=764789651&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Eighteen 15-mo-old Brangus steers were assigned randomly to one of three dietary treatment groups: cracked corn (Corn), casein-formaldehyde-protected Canola Lipid (CL), or casein-formaldehyde-protected Marble Plus (MP). All diets were equally balanced for ME (2.91 Mcal/kg), CP (12.5%), and DM (89%). Ether extract was 3.7, 6.9, and 6.9% for the Corn, CL, and MP diets, respectively. The CL and MP diets provided equal amounts of protected lipid (3.3%). The MP also contained 3.7% protected starch. Steers were fed their respective diets for 126 d before slaughter. Average daily gain and feed efficiency did not differ among treatments. Carcasses from steers fed Corn, CL, or MP did not differ in adjusted fat, ribeye area, hot carcass weight, or yield grade. Percentage KPH fat was higher for carcasses from CL- (3.2%) and MP-fed (2.5%) steers than for carcasses from Corn-fed (2.1%) steers. There were no differences in marbling score or quality grade for carcasses from steers fed Corn, CL, or MP. Warner-Bratzler shear force, meat palatability, and sensory flavor attributes of steaks did not differ among treatment groups. Glucose incorporation into total lipids (TL), glyceride-glycerol (GG), and fatty acid (FA) fractions was highest in s.c. adipose tissue from steers fed MP, but was unaffected by diet in i.m. adipose tissue. Insulin did not affect glucose incorporation into lipids for s.c. or i.m. adipose tissue. Percentages of 18:2 and 18:3 were higher in tissues from CL- and MP-fed steers. There were no treatment x tissue interactions for mean cell volume or cells/g. Adipocyte peak diameter tended to be greater in i.m. adipose tissues from steers fed CL (120 []m) and MP (120 []m) than from steers fed Corn (88 []m), but did not differ among treatments in s.c. adipose tissue. Intramuscular peak volume was greater in CL-fed steers (848 pL) than Corn-fed steers (536 pL). The activities of lipogenic enzymes did not differ among treatment groups for either s.c. or i.m. adipose tissue. We were not able to demonstrate a direct effect of protected starch and lipid on i.m. or s.c. cellularity, lipogenic enzyme activities, marbling score, or yield grade. |
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| Item Description: | Vita. "Major Subject: Animal Science". |
| Physical Description: | x, 47 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 40-46). |