Prediction of fat-free mass of pigs from 50 to 130 kilograms live weight
| Autor: | M. J. Marchello, J. E. Tilton, P M Swantek, J D Crenshaw |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Male
medicine.medical_specialty Swine Fat content Live weight Animal science Predictive Value of Tests Fat free mass Genetics medicine Animals Plethysmograph Animal Husbandry Mathematics Sex Characteristics Kilogram Body Weight General Medicine Slaughter weight Surgery Plethysmography Adipose Tissue Lean body mass Female Animal Science and Zoology Bioelectrical impedance analysis Food Science |
| Zdroj: | Journal of Animal Science. 77:893 |
| ISSN: | 0021-8812 |
| DOI: | 10.2527/1999.774893x |
| Popis: | Seventy-two Duroc x Hampshire x Yorkshire pigs were used to evaluate bioelectrical impedance procedures to predict fat-free mass of live pigs. Pigs were allotted by sex, ancestry, and weight. Pigs (12 gilts and 12 barrows) averaging 50+/-2.4 kg were slaughtered to establish a baseline for body composition. A pen of six gilts and a pen of six barrows were randomly selected for slaughter when the pen averaged either 70, 90, 110, or 130 kg. Pigs were weighed, then a four-terminal plethysmograph was used to measure resistance (omega) and reactance (omega), and length (cm) was measured between detector terminals. Pigs were slaughtered 12 h later, and carcasses were chilled for 24 h. The right side was ground twice and mixed and samples were frozen for later analyses of fat content. Actual fat-free mass (ActFFM) was determined from the weights and percentage of fat. Predicted fat-free mass (PredFFM) was calculated using the following equation: Pred FFM = .486 (live weight) - .881 (resistance) + .48 (length) + .86 (reactance) + 7.959. The correlation coefficients between ActFFM and PredFFM ranged from .66 to .91 overall. Correlation coefficients approximating slaughter weight (90 kg) were .94 (P < .02). Fat-free mass was underestimated by the prediction equation at all slaughter weights, but the predicted fat-free mass was highly correlated to the actual fat-free mass, except for the 110-kg gilts (r = .68, P = .15) and the 130-kg barrows (r = .65, P = .16). The data support the use of bioelectrical impedance to measure fat-free mass over a wide range of weights for finishing pigs. |
| Databáze: | OpenAIRE |
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