características físico-químicas da carcaça e da carne de novilhas submetidas ao anestro cirúrgico ou mecânico terminadas em confinamento carcass and meat traits of feedlot finished heifers submitted to surgical or mechanical anoestrous

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ID: 224194
2006
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Abstract
Objetivou-se com este trabalho avaliar o efeito da simulação da prenhez (introdução de 100 esferas de chumbo no útero - CHU) e da ovariectomia (retirada dos ovários - OVA) sobre as características físico-químicas da carcaça e da carne de novilhas. Foram utilizadas 19 novilhas mestiças (½ Nelore x ½ Red Angus), com 18 meses de idade e peso médio inicial de 257,8 kg, terminadas em confinamento recebendo uma dieta à base de silagem de milho (41%) e farelo de soja e milho (59%). O peso vivo ao abate, sem diferença entre tratamentos, foi de 324,1; 323,3 e 303,0 kg para as novilhas dos tratamentos VAZ, CHU e OVA, respectivamente. Da mesma forma, não houve diferença entre tratamentos para peso de carcaça quente (171,1 kg), comprimento de carcaça (113,8 cm), comprimento de perna (68,2 cm), espessura do coxão (21,0 cm), área de olho-de-lombo (57,3 cm²), espessura de gordura de cobertura (4,0 mm), proporções de músculo (62,6%), osso (16,0%) e gordura (21,7%), relação músculo/osso (3,9), relação músculo + gordura (porção comestível)/osso (5,3), perdas por cocção (24,3%), perdas do congelamento à cocção (30,9%), maciez (7,1 pontos), suculência (6,6 pontos) e palatabilidade (6,6 pontos). Os parâmetros cor, textura e marmoreio também não diferiram entre os tratamentos, apresentando, respectivamente, 4,0; 4,4 e 3,7 pontos. Não houve diferença significativa para os teores de cinzas (1,1%) e PB (21,8%) e para as concentrações de extrato etéreo total (2,9%) e colesterol (49,6 mg/100g) do músculo Longissimus dorsi. Portanto, a ocorrência do estro não alterou as características analisadas.
This study was conducted to evaluate the effect of pregnancy simulation (placement of 100 lead spheres in the uterus-LEAD) and ovariectomy (OVAE) on traits of carcass and meat of heifers finished in feedlot. Animals not pregnant and with intact ovary were used as the control (CTRL). Nineteen crossbred heifers (½ Nelore x ½ Red Angus) averaging 18 months of age and 257.8 kg of body weight were used. Animals were fed a diet containing (% DM): 41% of corn silage and 59% of soybean meal, corn, and trace minerals. No significant differences were observed for slaughter weight, which averaged 324.1, 323.3, and 303.3 kg, respectively, for CTRL, LEAD, and OVAE treatments. Similarly, there were no significant differences among treatments for the following variables: hot carcass weight (171.1 kg), carcass length (113.8 cm), hind limb length (68.2 cm), cushion thickness (21.0 cm), loin eye area (57.3 cm²), fat thickness (4.0 mm), percentages of muscle (62.6%), bone (16.0%), and fat (21.7%), muscle/fat ratio (3.9), muscle plus fat/bone ratio (5.3), cooking losses (24.3%), freezing to cooking losses (30.9%), tenderness (7.1 points), juiciness (6.6 points), and flavor (6.6 points). The color, texture, and marbling parameters also did not differ averaging 4.0, 4.4, and 3.7 points, respectively, among treatments. In addition, no significant differences were found to contents of ash (1.1%), crude protein (21.8%), total fat (2.9%), and cholesterol (49.6mg/100g) in the Longissimus dorsi muscle. Thus, it can be concluded that estrus did not affect carcass characteristics.
Reference Key
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Authors ;Jair de Araújo Marques;Ivanor Nunes do Prado;José Luiz Moletta;Ivor Martin do Prado;Juliana Martin do Prado;Lívia Maria Araújo Macedo;Nilson Evelázio de Souza;Makoto Matsushita
Journal european journal of lipid science and technology
Year 2006
DOI
10.1590/S1516-35982006000500034
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982006000500034
Keywords
carcass crude protein moisture

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