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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
06/04/2005 |
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Data da última atualização: |
06/04/2005 |
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Autoria: |
WOLF, B. T.; JONES, D. A.; OWEN, M. G. |
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Título: |
Carcass composition,conformation and muscularity in Texel lambs of different breeding history, sex and leg shape score. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Animal Science, v. 72, pt 3, p. 465-475, 2001. |
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Idioma: |
Inglês |
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Conteúdo: |
This study investigated the effects of flock, sex and leg shape scores (assessed in the live animal) on the carcass yield, conformation and composition of purebred Texellambs. Two flocks were managed in a common environment. The first (Lean Index flock) had a 6-year history of selection for lean tissue growth rate using an index of live weight and ultrasonic muscle and fat depths measured at 20 weeks of age. The second (Conformation flock) had recently been established by mating rams of extreme conformation selected from the UK Texel population with ewes in the Lean Index flock. Lambs were evaluated at a mean age of 139 days at the end of an 11-week performance test in which they were reared indoors on a concentrate diet. Prior to slaughter, the lambs were assessed for conformation of the hind leg (leg shape score). Mean live weights and ultrasonic fat depths dia not differ significantly between flocks or leg shape scores but ultrasonic muscle depths were highest in the high leg shape score (27.9, 27.7 and 30.1 mm in low, medium and high scores, s.e.d. 0.55). At constant slaughter weight, the lean weight in the side was 04 kg higher in the Conformation flock and 0.3 kg higher in lambs of high v. low leg shape score (P < 0.001) with no significant differences in other tissue weights. Consequently, lean : bone ratio and lean proportions in both the live weight and carcass were higher in the Conformation flock and in lambs of high leg shape score. Lambs of high leg shape score had better carcass conformation scores (14.1, 12.9 and 11.9, for high, medium and low scores respectively, s.e.d. 0.30), shorter side length and higher values for alI muscularity traits. Lean tissue distribution in major joints and individual muscles dia not differ between flocks but the mean proportion of total lean in the higher priced cuts was higher (553.1 v. 543.9g/kg, s.e.d. 3.26) for lambs of high v. low leg shape score. Males were 6.5 kg heavier than females at scanning (P < 0.001), had lower ultrasonic fat depths (2.8 v. 3.2 mm; P < 0.01) but did not differ in ultrasonic muscle depths. At equal slaughter age, males produced 1 kg more lean tissue and had a higher proportion of lean in the side than females (665.2 v. 638.9 g/kg) but did not differ in lean proportion in the live weight, carcass conformation and muscularity scores. Females carried a higher proportion of totallean in the higher priced,cuts (55.6 v, 541.8 g/kg; P < 0.01) and in some individual muscles. It was concluded that there is !mportant varlatlon within the Texel breed in lean yleld at constant live weight and that this is likely associated wlth differences between strain and conformation type. MenosThis study investigated the effects of flock, sex and leg shape scores (assessed in the live animal) on the carcass yield, conformation and composition of purebred Texellambs. Two flocks were managed in a common environment. The first (Lean Index flock) had a 6-year history of selection for lean tissue growth rate using an index of live weight and ultrasonic muscle and fat depths measured at 20 weeks of age. The second (Conformation flock) had recently been established by mating rams of extreme conformation selected from the UK Texel population with ewes in the Lean Index flock. Lambs were evaluated at a mean age of 139 days at the end of an 11-week performance test in which they were reared indoors on a concentrate diet. Prior to slaughter, the lambs were assessed for conformation of the hind leg (leg shape score). Mean live weights and ultrasonic fat depths dia not differ significantly between flocks or leg shape scores but ultrasonic muscle depths were highest in the high leg shape score (27.9, 27.7 and 30.1 mm in low, medium and high scores, s.e.d. 0.55). At constant slaughter weight, the lean weight in the side was 04 kg higher in the Conformation flock and 0.3 kg higher in lambs of high v. low leg shape score (P < 0.001) with no significant differences in other tissue weights. Consequently, lean : bone ratio and lean proportions in both the live weight and carcass were higher in the Conformation flock and in lambs of high leg shape score. Lambs of high leg shape score ... Mostrar Tudo |
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Palavras-Chave: |
Composição; Conformação. |
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Thesagro: |
Carcaça; Cordeiro; Músculo; Ovino. |
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Thesaurus Nal: |
Texel. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03321naa a2200229 a 4500
001 1531076
005 2005-04-06
008 2001 bl uuuu u00u1 u #d
100 1 $aWOLF, B. T.
245 $aCarcass composition,conformation and muscularity in Texel lambs of different breeding history, sex and leg shape score.
260 $c2001
520 $aThis study investigated the effects of flock, sex and leg shape scores (assessed in the live animal) on the carcass yield, conformation and composition of purebred Texellambs. Two flocks were managed in a common environment. The first (Lean Index flock) had a 6-year history of selection for lean tissue growth rate using an index of live weight and ultrasonic muscle and fat depths measured at 20 weeks of age. The second (Conformation flock) had recently been established by mating rams of extreme conformation selected from the UK Texel population with ewes in the Lean Index flock. Lambs were evaluated at a mean age of 139 days at the end of an 11-week performance test in which they were reared indoors on a concentrate diet. Prior to slaughter, the lambs were assessed for conformation of the hind leg (leg shape score). Mean live weights and ultrasonic fat depths dia not differ significantly between flocks or leg shape scores but ultrasonic muscle depths were highest in the high leg shape score (27.9, 27.7 and 30.1 mm in low, medium and high scores, s.e.d. 0.55). At constant slaughter weight, the lean weight in the side was 04 kg higher in the Conformation flock and 0.3 kg higher in lambs of high v. low leg shape score (P < 0.001) with no significant differences in other tissue weights. Consequently, lean : bone ratio and lean proportions in both the live weight and carcass were higher in the Conformation flock and in lambs of high leg shape score. Lambs of high leg shape score had better carcass conformation scores (14.1, 12.9 and 11.9, for high, medium and low scores respectively, s.e.d. 0.30), shorter side length and higher values for alI muscularity traits. Lean tissue distribution in major joints and individual muscles dia not differ between flocks but the mean proportion of total lean in the higher priced cuts was higher (553.1 v. 543.9g/kg, s.e.d. 3.26) for lambs of high v. low leg shape score. Males were 6.5 kg heavier than females at scanning (P < 0.001), had lower ultrasonic fat depths (2.8 v. 3.2 mm; P < 0.01) but did not differ in ultrasonic muscle depths. At equal slaughter age, males produced 1 kg more lean tissue and had a higher proportion of lean in the side than females (665.2 v. 638.9 g/kg) but did not differ in lean proportion in the live weight, carcass conformation and muscularity scores. Females carried a higher proportion of totallean in the higher priced,cuts (55.6 v, 541.8 g/kg; P < 0.01) and in some individual muscles. It was concluded that there is !mportant varlatlon within the Texel breed in lean yleld at constant live weight and that this is likely associated wlth differences between strain and conformation type.
650 $aTexel
650 $aCarcaça
650 $aCordeiro
650 $aMúsculo
650 $aOvino
653 $aComposição
653 $aConformação
700 1 $aJONES, D. A.
700 1 $aOWEN, M. G.
773 $tAnimal Science$gv. 72, pt 3, p. 465-475, 2001.
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Embrapa Caprinos e Ovinos (CNPC) |
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