EVALUATION OF MODELS TO ESTIMATE EMPTY BODY WEIGHT IN HAIR SHEEP RAISED IN A FEEDLOT SYSTEM

Eufracia del R. Salazar-Cuytun, Gabriel Enrique Pool-Yanez, Rodrigo Portillo-Salgado, Gamaliel Antonio-Molina, Ricardo A. Garcia-Herrera, Enrique Camacho-Perez, Claudia V Zaragoza-Vera, Einar Vargas-Bello-Perez, Alfonso Juventino Chay Canul

Abstract


Background. The empty body weight (EBW) represents exactly the animal mass and is used as a base to calculate most of the nutrient requirements in most feeding systems. Objective. To evaluate models for estimating EBW in growing hair sheep in a feedlot system under tropical conditions. Methodology. One hundred fifteen male growing hair sheep lambs (Pelibuey, Black Belly, and Katahdin) between four to ten months of age with a mean shrunk body weight (SBW) of 34.50 ± 7.40 kg (± SD) were used. The relationship between SBW and EBW was assessed by means of three models: Eq. 1. Linear with intercept; Eq. 2.- Linear without intercept and Eq. 3.- Allometric. The predictive ability of models was evaluated by cross-validation. Results. The correlation coefficient among SBW and EBW was high (r = 0.98). The regression equations had high determination coefficients (r2) of 0.97. Based on the evaluations Eq.1 had the performance compared with other models. The following final model was fitted to estimate the EBW as a function of SBW of growing castrated male hair sheep: EBW (kg): -2.39 (± 0.53***) + 0.95(± 0.02***) × SBW (kg). Implications. These results contribute to the development of mathematical models for more accurate weight adjustments in growing hair sheep in a feedlot system under tropical conditions. Conclusion. The equation developed and evaluated in the present study revealed that the linear relationship between SBW and EBW can be used to predict EBW in hair sheep, for that the use of this model can be safely applied to male hair sheep. In addition, it was found that the relation BW/EBW was on average 1.18 for males. 

Keywords


hair sheep; empty body weight; sheep requirements; tropical conditions.

Full Text:

PDF

References


AFRC., 1993. Energy and Protein Requirements of Ruminants, Agricultural and Food Research Council. CAB Interna-tional, Wallingford, UK, 159.

ARC. 1980. The Nutrient Requirements of Ruminant Livestock. London: Agricultural Research Council. The Gresham Press, 351 p.

Baião, E.A.M., 2006. Composic¸ ão corporal e exigênciasnutricionais de cordeiras da rac¸ a Santa Inês e cruzas F1. Tese (Dou-torado). Universidade Federal de Lavras – UFLA, Minas Gerais – Brasil.

Barcelos, S.S., Souza, A.K., Mezzomo, R., Barros, L.J., Oliveira, C.D., Íris, G.D., Sampaio, O.L.R., Batista, N.K. and Pies, G.M., 2020. Energy and protein requirements of woolless sheep under tropical conditions. Livestock Science, 231, 103856. https://doi.org/10.1016/j.livsci.2019.103856

Campos, L.M., Almeida, A.K., Biagioli, B., Resende, K.T. and Teixeira, I.A.M.A., 2017. Predicting empty body weight in growing goats: a meta-analytic approach. Small Ruminant Research, 155, pp. 45–50. https://doi.org/10.1016/j.smallrumres.2017.09.002

Cannas, A., Tedeschi, L.O., Fox, D.G., Pell, A.N. and Van Soest, P.J., 2004. A mechanistic model for predicting the nutrient re-quirements and feed biological values for sheep. Journal of Animal Science, 82, pp. 149–169. https://doi.org/10.2527/2004.821149x

Chay-Canul, A.J., Ayala-Burgos, A.J., Kú-Vera, J.C., Magaña-Monforte, J.G. and Ferrell, C.L., 2011. Metabolizable energy intake and changes in body weight and body condition of Pelibuey ewes fed three levels of roughage diets under tropical conditions. Tropical and Subtropical Agroecosystems, 14, pp. 777–786.

Chay-Canul, A.J., Espinoza-Hernández, J.C., Ayala-Burgos, A.J., Magaña-Monforte, J.G., Aguilar-Perez, C.F., Chizzotti, M.L., Tedeschi, L.O. and Ku-Vera, J.C., 2014. Relationship of empty body weight with shrunken body weight and carcass weights in adult Pelibuey ewes at different physiological states. Small Ruminant Research, 14, 117, pp. 10–14. https://doi.org/10.1016/j.smallrumres.2013.11.019

Chay-Canul, A.J., Magaña-Monforte, J.G., Chizzottic, M.L., Piñeiro-Vázquez, A.T., Canul-Solis, J.R., Ayala-Burgos, A.J., Ku-Vera, J.C. and Tedeschi, L.O., 2016. Energy requirements of hair sheep in the tropical regions of Latin America. Review. Revista Mexicana de Ciencias Pecuarias, 7, pp. 105–125. https://doi.org/10.22319/rmcp.v7i1.4152

Duarte-Vera, F., Sandoval-Castro, C.A., Sarmiento-Franco, L.A., Tedeschi, L.O. and Santos-Ricalde, R., 2012. Energy and protein requirements of growing Pelibuey sheep under tropical conditions estimated from a literature database analyses. Tropical and Subtropical Agroecosystems, 15, pp. 97–103.

Gionbelli, M.P., Duarte, M.S., Valadares Filho, S.C., Detmann, E., Chizzotti, M.L., Rodrigues, F.C., Zanetti, D., Gionbelli, T.R.S. and Machado, M.G., 2015. Achieving body weight adjustments for feeding status and pregnant or non-pregnant condition in Beef cows. PLoS ONE, 10(3), e0112111. https://doi.org/10.1371/journal.pone.0112111

Herbster, C.J.L., Silva, L.P., Marcondes, M.I., García, I.F.F., Oliveira, R.L., Cabral, L.S., Souza, J.G. and Pereira, E.S., 2020. Weight adjustment equation for hair sheep raised in warm conditions. Animal, 14(8), pp. 1718–1723. https://doi.org/10.1017/S1751731120000294

Hunter, J. D., 2007. Matplotlib: A 2D graphics environment, Version = 3.3.2. https://matplotlib.org/

McKinney, W., 2010. Data Structures for Statistical Computing in Python, Version = 1.1.3. https://pandas.pydata.org/

Mendes, M.S., Souza, J.G., Herbster, C.J.L., Brito Neto, A.S., Silva, L.P., Rodrigues, J.P.P., Marcondes, M.I., Oliveira, R.L., Bezerra, L.R. and Pereira, E.S., 2021. Maintenance and growth requirements in male Dorper × Santa Ines lambs. Frontiers in Veterinary Science, 8, 676956. https://doi.org/10.3389/fvets.2021.676956

National Research Council (NRC)., 2007. Nutrient requirements of small ruminants: sheep, goats, cervids and new world camelids. Washington, DC. The National Academies Press, USA. https://doi.org/10.17226/11654

Newville, M., Stensitzki, T., Allen, D.B. and Ingargiola, A. 2014. LMFIT: Non-linear least-square minimization and curve-fitting for Python, Version=1.0.2. https://doi.org/10.5281/zenodo.11813

Pedregosa, F., Varoquaux, G., Gramfort, A., Thirion, B., Blondel, M., Prettenhofer, P., Weiss, R., Perrot, M. and Duchesnay, E., 2011. Scikit-Learn: Machine Learning in Python, Version = 0.23.2. https://scikit-learn.org/

Pereira, E.S., Lima, F.W.R., Marcondes, M.I., Rodrigues, J.P.P., Campos, A.C.N., Silva, L.P., Bezerra, L.R., Pereira, M.W.F. and Oliveira, R.L., 2017. Energy and protein requirements of Santa Ines lambs, a breed of hair sheep. Animal, 11(12), pp. 2165–2174. https://doi.org/10.1017/S1751731117001185

Owens, F.N., Gill, D.R., Secrits, D.S. and Coleman, S.W., 1995. Review of some aspects of growth and development of feedlot cattle. Journal of Animal Science, 73, pp. 3152–3172. https://doi.org/10.2527/1995.73103152x

Regadas Filho, J.G.L., Pereira, E.S., Pimentel, P.G., Villarroel, A.B.S., Medeiros, A.N. and Fontenele, R.M., 2013. Body composition and net energy requirements for Santa Ines lambs. Small Ruminant Research, 109, pp. 107–112. http://dx.doi.org/10.1016/j.smallrumres.2012.07.011

Tedeschi, L.O., Cannas, A. and Fox, D.G., 2010. A nutrition mathematical model to account for dietary supply and requirements of energy and nutrients for domesticated small ruminants: The development and evaluation of the Small Ruminant Nutrition System. Small Ruminant Research, 89, pp. 174–184. https://doi.org/10.1016/j.smallrumres.2009.12.041




URN: http://www.revista.ccba.uady.mx/urn:ISSN:1870-0462-tsaes.v25i3.42136

DOI: http://dx.doi.org/10.56369/tsaes.4213

Bookmark and Share


Copyright (c) 2022 Alfonso Juventino Chay Canul, Eufracia del R. Salazar-Cuytun, Rodrigo Portillo-Salgado

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.