Methods of body composition estimative of growing goats
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Universidade Estadual de Maringá
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The objective of this study was to compare me thods for estimative of body composition of goats based on tritiated water space technique (T OH), specific gravity (SG) of carcass and 9-11 th ribs. Ten Toggenburg x Alpine intact male goat kids, from 5.3± 0.4 to 25.9±1.3 kg of body weight (BW), were used to estimate body composition by: 1) direct method, 2) TOH method, 3) SG of the carcass and 4) SG of the 9-11 th whole ribs. In addition, update linear equations for predicting body composition were developed using data from direct method. Th e TOH space overestimated water bo dy composition on average 31%. The SG of the carcass and 9-11 th ribs underestimated water empty body composition (%) on average 21 and 12%, respectively. In spite of its overestimate, the de termination of TOH space can be used as a reliable field technique to study relative changes in body composition of growing goats. Specific gravity is practicable in most circumstances and does not require expensive equipment. However, the SG of the carcass and 9-11 th ribs has not a valid equation to predict body composition of growing goats.
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