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- Title
Comparison of mathematical models to estimate live weight from heart girth in growing Pelibuey sheep.
- Authors
Canul-Solís, Jorge-Rodolfo; Portillo-Salgado, Rodrigo; García-Herrera, Ricardo-A.; Castillo-Gallegos, Epigmenio; Castillo-Sanchez, Luis-Enrique; Camacho-Perez, Enrique; Chaves-Gurgel, Antonio-Leandro; Marques-Costa, Carolina; Bezerra-Fernandes, Patrick; Chay-Canul, Alfonso-Juventino
- Abstract
Background: Assessment of animal growth based on live weight (LW) in traditional sheep production systems is limited by the high cost of purchase and maintenance of livestock scales. Objective: To develop and evaluate equations for LW prediction using heart girth (HG) in growing Pelibuey sheep. Methods: A dataset (n=415) of clinically healthy male Pelibuey sheep from two months to one year of age, with an average LW of 25.96 ± 10.25 kg and HG of 68.31 ± 10.53 cm, were used. Three equations were evaluated: LW (kg) = -37.70 + 0.93 x HG (Eq. 1); LW (kg) = -1.74 + 0.19 x HG + 0.008 x HG² (Eq. 2); and LW (kg) = 0.003 x HG2.68 (Eq. 3). Results: The correlation coefficient between LW and HG was r = 0.94 (p<0.001). The three equations showed a high concordance correlation coefficient (CCCs≥0.97). However, the random error was the main component of the mean square partition of the prediction error (≥82.78%) only for Eqs. 1 and 2. The test for parameter identity (intercept=0; slope=1) was accepted only for Eq. 2 (p>0.05). On the other hand, for Eqs. 1 and 3 the intercept was different from zero and the slope was different from one (p<0.05). Conclusion: The second-degree equation accurately and precisely estimated body weight of growing Pelibuey sheep using the HG as a sole predictor variable.
- Subjects
MEXICO; SHEEP; INDEPENDENT variables; MATHEMATICAL models; MAINTENANCE costs; BODY weight
- Publication
Revista Colombiana de Ciencias Pecuarias, 2023, Vol 36, Issue 2, p89
- ISSN
0120-0690
- Publication type
Article
- DOI
10.17533/udea.rccp.v36n2a4