Relationship between body and testicular measurements in young buffalo bulls in Cuba

Yanara Almaguer; Harold Font; Suitberto Cabrera; Yaritza Arias

doi:10.17533/udea.rccp.v30n2a05

Authors

Yanara Almaguer University of Granma
Harold Font University of Granma
Suitberto Cabrera Polytechnic University of Valencia
Yaritza Arias Research Center for Animal Improvement of Tropical Livestock

DOI:

https://doi.org/10.17533/udea.rccp.v30n2a05

Keywords:

body weight, modeling, nonlinear regression, scrotal circumference, thoracic perimeter

Abstract

Background: appropriate selection of sires holds great importance in plans to genetically improve and raise buffalos. Objective: to obtain a statistical model that provides accurate associations between body and testicular measurements intended for selection of Bufalypso breed sires. Methods: measurements of body weight (BW), thoracic perimeter (TP), and scrotal circumference (SC) from 649 buffalos aged 2 to 36 months, were used to obtain the models corresponding to the associations between these traits. The statistical significance of the model and the model’s parameters were evaluated using a one-way analysis of variance. The best-fit model was established by calculating determination coefficients (R²) and mean squared error (SE). Results: the most adequate regression model between thoracic perimeter and body weight was TP = 19.89*BW0.37, with 99% and 0.03 for R² and, SE, respectively. The best association between scrotal circumference and body weight was obtained with the model SC = 1.13*BW0.51, with values of 89% for R²and of 0.1 for SE. The model that best expressed the relationship between scrotal circumference and thoracic perimeter was SC = 0.02*TP0.89, with R² = 89% and SE = 0.01. Conclusion: nonlinear models described better the association between body and testicular measurements than the linear ones. These results suggest that nonlinear models are effective for selecting buffalo sires.

Keywords: , .

Resumen

Palabras clave: circunferencia escrotal, modelación, perímetro torácico, peso corporal, regresión no lineal.

Resumo

Palavras chave: circunferência escrotal, modelagem, perímetro torácico, peso corporal, regressão nãolinear.

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Author Biographies

Yanara Almaguer, University of Granma

VM., Faculty of Veterinary Medicine, University of Granma, Cuba.

Harold Font, University of Granma

VM., MSc., Faculty of Veterinary Medicine, University of Granma, Cuba.

Suitberto Cabrera, Polytechnic University of Valencia

Eng., PhD., Department of Statistics and Applied Operation Research and Quality, Polytechnic University of Valencia, Spain

Yaritza Arias, Research Center for Animal Improvement of Tropical Livestock

VM, MSc., Research Center for Animal Improvement of Tropical Livestock, Cuba.

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