Purroy A. (ed.).
Etat corporel des brebis et chèvres Zaragoza : CIHEAM
Options Méditerranéennes : Série A. Séminaires Méditerranéens; n. 13 1992
pages 25-30
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--- D elfa R., Blasco I., Colomer-Rocher F., Teixeira A. U ltrason ic estimates of fat th ickn ess, C measu remen t an d lon gissimu s dorsi depth in R asa Aragon esa ewes with same body con dition score. In : Purroy A. (ed.). Etat corporel des brebis et chèvres. Zaragoza : CIHEAM, 1992. p.
25-30 (Options Méditerranéennes : Série A. Séminaires Méditerranéens; n. 13)
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Ultrasonic estimates of fat thickness,
C measurement and longissimus dorsi depth in rasa aragonesa ewes with same body
condition score
R. DELFA”
A. TEIXEIRA**
1. BLASCO*
F. COLOMER-ROCHER”
*SERVICIO DE INVESTIGACION AGR ;ARI A DIPUTACION GENERAL ARAGON APDO. 727 ZARAGOZA, SPAIN
**ESCOLA SUPERIOR AGRARIA DE BRAGANÇA APT. 172,5301 BRAGANÇA CODEX, PORTUGAL
- of fat thickness, C and longissimus depth assessed in 14
ewes with same body condition The estimates have been used tota1 fat and muscle. The 76% of the in fat thickness was accounted by in fat thickness assessed by
53% of the in C was accounted. only 5% of in m.
Longissimus dorsi depth was by in this assessed by The inclusion of cold
weight as an in a multiple with fat thickness assessed by and the same
on of total fat and muscle and 91%).
- On n estimé sur 14 brebis adultes Aragonesa précisior1 avec laquelle les ultrasons peuvent mesurer “in vivo”
l’épaisseur du tissus a d i p e u sous-cutnné, la m w r e C et l’épaisseur du in. Longissinm dorsi. ainsi que de ces mesures coinme prédicteurs du gras et du nnlscle totnl de la cnrcasse. L’épaisseur du grns lombaire déterminé “in vivo” par ultrnsons exprime 76 et 53 p.100 respectivenzent des variations de du gras lombaire et de la mesure C prise sur la cnrcasse, dors que du Longissimus déterminé par ultrasons n’explique que S p.100 de ln vnriation. L’incorporntion des varinbles : poids de la cnrcasse fioide et épaisseur d u gras lombaire mesurée sur ln carcasse et par ultrasons dans l’équation de régression ntultiple, améliore la précision pourprédire le gras ou le nzuscle total de la carcasse (r= 81 et 91 p.100 respectivement).
Introduction
a detailed about the use of toestimate the cow composition, S i m (1983) and
The scanning have been used (1984) showed that the of
the subcutaneous fat, fat thickness and m. muscles best of yield, muscle/bone
Longissimus dorsi of live pigs weight of joints and the fat
et al., 1979) and cattle (Eveleigh et al., 1985; thickness best of fat and et al., 1986 and et al., 1986). muscle contents.
A been published about use in live ewes et al., 1982).
(1958) had suggested that the have a
little use in thickness and m.
Lo~zgisssinzus dorsi of ewes.
Campbell et al. (1959) a significant
between L o n g i s s i r ~ ~ ~ ~ s dorsi depth estimated by on sheep
et aZ. (1965) using 235 live lambs, a
of showed that
with an acceptable the fat thickness and m.
Longis,rinzus domi the
between m. Longissirnus dorsi assessed by in live animal and the same
obtained on the was only 0.66, and the thickness
assessed by and the
assessed on the was 0.34.
et (1982) using an evaluation of two machines have found little
the body composition of live sheep and questioned the use of these machines of the muscle in
to the difficulty
assess the is the
fleece. This difficulty can be by
body assessed.
The objective of the study was to
the of the use of to
the fat thickness, C lorzgissinzus depth and total muscle
ewes, with same body condition
Material and methods
14 ewes aged 3 with the
same body (3)
flock of de
de la de
24 the thickness
1) and m. Longissimus dorsi depth 2) was assessed by machine (Toshiba
- 32 with a 5,O on
live animal on the The ewes
the of
- 24 fasting.
The cooled at 6°C 24
fat thickness was on with on the same
assessed in live animal with machine.
The halved and the left side
was dissected into muscle, bone, subcutaneous,
Fig. 1. fat thickness assessed by machine.
Fig. 2. Longissimus assessed by machine.
-26-
kidney and pelvic fat. The (depth of eye muscle - the
distance at angles to A on the same and C (thickness of back-fat the deepest of the eye muscle) 1939)
on the cut between and
of a joint by and
(1989).
The
assessed by machine in live animals and
on analyzed using
and analyses 1980).
Results and discussion
The coefficients between the
assessed by machine in live
animals on showed in Table 1.
76% of the in thickness
was accounted by thickness
assessed in live animal by machine,
53% of the in C was accounted.
The coefficients because
on the
anatomical and the of
coefficients
the anatomical point selected Simm (1983).
The small m. Longissimus dorsi
depth assessed by and the same
on the (0.22), suggest that a good technic to evaluate this
the depth is highly with m. Lorzgissimtls dorsi weight
1961).
et al. (1965) found the coefficients of 0.52, 0.63 and 0.66 between m. Longissimus dorsi
of
3, 4 and 5 the
exposed and the Table 2 show the
coefficients between the total fat with the cold
and on live
animal with machine and on
Table 3 shows the coefficients between total muscle with the cold
assessed by and the same obtained on coefficients significant
The inclusion of cold weight as an
in a multiple with
fat thickness assessed by and the
on the
of total fat and total muscle
Total fat = 227.45 CCW -t 454.24 L l T h C - 253.86 LFThUlt. - 1172.19 s,,=551.66)
Total muscle = 625.51 CCW
+
70.68 LFThC - 453.96 LFThUlt+
sF=403.28)These suggest that the inclusion of assessed by and obtained on as independent in a multiple
good of muscle and
weights; this with the of Simm (1983) and (1984) obtained with cattle.
Conclusions
obtained, we could conclude:
- The estimates good of
thickness in ewes;
- The anatomical we assessed the fat thickness in live animals, can change of
fat thickness;
-
The do not estimate with the m Loragissiwzus doni depth;-
The fat thickness assessed by inlive animal on best
of total muscle and fat.
References
in on vivo
of body composition in meat animals.
3-7.
JENSEN, J. and
(1986). body
muscle young
bulls. J. Anim. Sci., 63~1337-1346.
A.L.
(1959). The use of to estimate the size of the longissimus muscle in sheep. J. Anim. Sci., 2#:364-367.
A. and
F. (1989). A note on the use of a joint as a of body fat depots in ewes with
49:321-329.
C.J.,
(1985). A note on the ability of
41:247-248.
J.W., W.T.
(1986). of cow
live J. Anim.
Sci., 63:1041-1048.
(1958). Sound waves fat and lean.
by W.G., S.E.,
C.V. 1965. of
fat thickness and Longissimus in lambs. J. Anim.
Sci., 24:364-367.
J., A., OWEN,
J.C. (1979). of
the body composition of live pigs.
29:175-181.
J., J.C. and
(1982). An evaluation of
the
body composition of 34:249-255.
W.G., S.E., C.V. and
(1965). of fat
thickness and longissimus lambs. J. Anim. Sci., 24:364-367.
(1939). quality in the sheep with
to J. Sci.,
29.544-626.
G. (1983). The use of to of live cattle - a
51:853-875.
Fig. 3.
J.S. and (1961).
mutton J. Sci., Camb., 57:319-323.
STEEL, (1980).
of New
Table 1. Correlation coefficients between measurements obtained on carcass and assessed live animals by ultrasonic machine.
B Ult LFTh C
0.22 N.S.
0.73a:":
C
0.87""
"* 0.01
on (LFThC)
fat thickness assessed by
C (C)
on
Ult)
y = 1.334 X - 1.281 ( r = 0.87; SI, = 0.218: Syr = 1.06)
8 -
thickness assessed by
thickness assessed by and on (y)
tio]
thickness assessed by
nship thickness assessed by and on (
-28-
'1
7
O
/
u 3 4
o x
Oo
I l 1 I I
O 1 2 3 4 5 6 7
by
Fig. 4. thickness assessed by (X) C (y)
O O
O
O
O
21 I I 1 I l I l I
10 11 12 13 14 15 16 17 18 19 20
by
Fig. 5. assessed by (X) and (y)
Table 2. Correlation coefficients between total carcass fat and cold carcass weight, measurements obtained on carcass and assessed in live animals by ultrasonic machine.
LFThUlt LFThC
CCW
+
LFThUlt LFThUlt+
Ult CCW+
LFTh CCCW
+
LFThC+
LFThUltp< 0.01
on thickness assessed
assessed by Ultj
("W)
Total fat = 227.45 CCW -t 454.24 LFThC - 253.86
~ ~ h 5 5 1 . 6 6 ) LFThUlt - 1172.19
Table 3. Correlation coefficients between total carcass muscle and cold carcass weight, measurements obtained on carcass and assessed in live animals by ultrasonic machine.
ccw
CCW
+
Ult CCW+
LFThUlt CCW+
LFThUlt+
Ult CCW+
LFTh CCCW
+
LFThC+
LFThUlt~~
"*
0.01on by
assessed by Ultj
Cold weight (CCW)
Total muscle fat = 625.51 CCW
+
70.68 LFThC - 453.96 s,,=403.28)LFThUlt - 671.03
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