Callipyge (CLPG, n=16) and normal (N, n=11) lambs were
produced from Polypay dams and Dorset sires heterozygous for
the CLPG gene to study the effects of the gene on growth and
carcass and meat quality parameters. CLPG lambs had higher
average daily gain than N lambs (0.26 vs 0.23 kg/day, p<.05);
however, the CLPG gene did not affect feed efficiency. Lambs
were slaughtered in three groups to achieve moderate
uniformity in slaughter weight. At the time of slaughter,
weights of head, pelt, and internal organs were recorded. Two
leg muscles, two shoulder muscles, the longissimus dorsi
muscle, and two loin chops cut 2.5 cm thick, were dissected
from each carcass. CLPG lambs had a higher dressing percent
(p<.01) and lighter head, pelt, liver (all p<.01), and
kidney/pelvic fat (p<.05). CLPG lambs had less fat over 12th
rib (p<.05) and larger ribeye area (p<.01). CLPG lambs had
greater weights of Biceps femoris (42%, p<.05),
Semimembranosus (34%, p<.01), Triceps brachii (20%, p<.05),
longissimus dorsi muscle (29%, p<.01) and whole leg (6%,
p<.05) than N lambs. All the dissected muscles from all
carcasses and one whole leg from each ewe lamb carcasses
(n=11) were cooked to an internal temperature of 70��C. CLPG
carcasses produced higher Warner-Bratzler shear values for
loin chops (4.79 vs 2.93 kg, p<.01), Biceps femoris (3.94 vs
2.92 kg, p<.05), Semimembranosus (4.75 vs 3.46 kg, p<.05) and
Longissimus dorsi muscle (5.29 vs 3.4 kg, p<.01) than N lambs.
However, no significant differences were detected in shear
values for Biceps femoris (3.10 vs 3.04 kg) or Semimembranosus
(3.77 vs 3.29 kg) when the muscles were dissected after
roasting the whole leg. The CLPG gene also had no effect on
the shear values for two dissected shoulder muscles (Deltoid
and Triceps brachii). The two genotypes did not differ in
either cooking loss or percent moisture in any of the muscles
compared. / Graduation date: 1998
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/33760 |
| Date | 20 May 1997 |
| Creators | Srinivasan, Haribaskar |
| Contributors | Meyer, Howard H. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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