Estimation of the meatness and fatness of 9- and
12-week-old Mulard ducks on the basis of selected
live body measurements

Ksiazkiewicz, J.; Mazanowski, A.

doi:10.22358/jafs/69882/1993

J. Anim. Feed Sci.

1993

DOI: 10.22358/jafs/69882/1993

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Estimation of the meatness and fatness of 9- and 12-week-old Mulard ducks on the basis of selected live body measurements

J. Ksiazkiewicz¹,

A. Mazanowski²

Abstract: In 80 Mulard ducks (crossing of Muscovy drakes with Pekin ducks) at 9-and 12-weeks of age the relationships between alive body measurements and live body weight and percentage content of breast and legs muscles, skin with subcutaneous fat, abdominal and intestinal fat and bones in the carcass were determined.According to the multiple regression equations the following parameters are useful for estimating the percentage of meat in 9-and 12-week-old living Mulard ducks: thorax lenght, shank length, breast circum… Show more

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Multiple regression equations to estimate the content of breast muscles, meat, and fat in Muscovy ducks

et al. 2006

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The aim of the present study was to derive multiple regression equations for in vivo estimation of the carcass lean and fat content in Muscovy ducks. The experimental materials consisted of 240 White Muscovy ducklings (120 male and 120 female). One hundred sixteen females aged 10 wk and 112 males aged 12 wk were slaughtered. Before slaughter the ducks were weighed, and the following body measurements were taken: humerus length, drumstick length, chest girth, breast-bone crest length, width between the humeral bones, chest depth, and breast muscle thickness. The coefficients of simple correlation between carcass tissue components and body measurements were calculated. It was found that live body weight was highly correlated with the weights of all tissue components (r = 0.701 to 0.857). In males a significant interrelation was found between breast muscle weight and all body measurements, whereas in females breast muscle weight was correlated with breast-bone crest length, chest girth, width between the humeral bones, chest depth, and breast muscle thickness only. In both males and females the carcass lean content was closely correlated with drumstick length, breast-bone crest length, chest girth, and width between the humeral bones. In drakes the carcass fat content was closely correlated with all body measurements, whereas in hens significant correlations were observed between the carcass fat content and chest girth, width between the humeral bones, and chest depth only. The coefficients of simple correlation between the percentages of carcass tissue components and body measurements were generally low and statistically nonsignificant. Twelve multiple regression equations formulated based on the body measurements of live ducks were verified with respect to the accuracy of estimation of the content of breast muscles, meat, and fat with skin in the carcass. These equations give small SE of the estimate (Sy = 23.3 to 83.8 g), high values of coefficients of multiple correlation between the dependent variable and the set of independent variables, and high values of determination coefficients.

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Multiple regression equations to estimate the content of breast muscles, meat, and fat in Muscovy ducks

et al. 2006

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In vivo prediction of the carcass fatness using live body measurements in Pekin ducks

Lin¹,

Zhu²,

Hao³

et al. 2018

Poultry Science

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The purpose of this study was to evaluate the correlation between live body measurements and several fat traits in Pekin ducks, and ultimately to formulate multiple regression equations for the in vivo estimation of the carcass fatness of Pekin ducks. Several traits were measured in a total of 208 Pekin ducks aged 6 wk (107 males and 101 females). All ducks were weighed and measured for a set of body measurements including live body weight, body slope length, breast muscle thickness, skin fat thickness, chest width, keel length, and neck length. The breast muscle thickness and skin fat thickness was measured using B-scan sonography. Carcass information, including eviscerated weight, subcutaneous fat with skin weight, and abdominal fat weight, was collected after slaughter. Our results revealed that sex effects on most traits were significant (P < 0.05), and that the weight of subcutaneous fat with skin was significantly correlated with live body weight (r = 0.57 to 0.71, P < 0.01). Four additional traits of males were closely correlated with the weight of subcutaneous fat with skin, namely breast muscle thickness (r = 0.20, P < 0.01), skin fat thickness (r = 0.43, P < 0.01), chest width (r = 0.24, P < 0.01), and neck length (r = 0.20, P < 0.05). The abdominal fat weight, percentage of fat, and percentage of subcutaneous fat with skin of ducks were significantly correlated with live body weight (r = 0.38 to 0.43, P < 0.01), and skin fat thickness (r = 0.38 to 0.49, P < 0.01). These traits provided the basis for constructing regression equations to predict weight (or percentage) of subcutaneous fat and abdominal fat with high values of coefficients of multiple correlation (R) between the dependent variable and the independent variables. Two equations were verified to be applicable in other duck groups, with high accuracy, as more than 80% of estimated values were within the margin of error (<10%), compared with the actual values.

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Estimation of the meatness and fatness of 9- and 12-week-old Mulard ducks on the basis of selected live body measurements

Cited by 2 publications

References 0 publications

Multiple regression equations to estimate the content of breast muscles, meat, and fat in Muscovy ducks

Multiple regression equations to estimate the content of breast muscles, meat, and fat in Muscovy ducks

In vivo prediction of the carcass fatness using live body measurements in Pekin ducks

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