Body composition estimation in vivo and on the carcass of pigs raised on pastures
To compare the prediction of body composition in vivo and in slaughtered animals, a pig population with a broad genetical background, was used to determine the extent on which that prediction was affected by different characters (sex, slaughter body weight and lean percentage). Seventy-two barrows and 57 gilts were measured firstly ultrasonically (PigLog 105 - P) in vivo and then their carcasses were evaluated with a Fat-O-Meater apparatus (FOM) at the abattoir. Data were analysed by means of the Student t test for paired observations and subjected to linear correlation studies with the correlation coefficient. P and FOM measurements of lean percentage were positively and significantly associated (r = 0.68, P<0.01). Sensitivity, specificity, positive and negative predictive values of in vivo evaluations were also assessed. P measurements underestimated both muscle depth and fat thickness and did not show significant differences in lean percentage when compared to FOM values. As live evaluation showed a low sensitivity, lean percentage estimated in vivo with P can not be considered a good individual estimator of the same trait when measured in the carcass using FOM, notwithstanding its usefulness as an estimator of the average lean percentage of the group as a whole.
| Main Authors: | , , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Asociacion Latinoamericana de Produccion Animal
2005
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| Online Access: | https://ojs.alpa.uy/index.php/ojs_files/article/view/118 |
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