Prediction of total protein percentage from partial sampling and adjustment of environmental effects
Journal Title: Revista MVZ Cordoba - Year 2012, Vol 17, Issue 1
Abstract
Objective. To find a mathematical expression for calculating the average percentage of total protein (APTP) from the partial production (PP) and other environmental factors that affect this characteristic. Materials and methods. The study was conducted on three dairy farms in the department of Antioquia, Colombia. 182 Holstein cows were sampled; the data capture was carried out through monthly sampling of the two daily milking sessions. Milking activity beginning time, milk production, number of births produced, season of parturition and days in lactation were recorded. The statistical analysis was conducted using a multiple regression model which identified significant sources of variation on the total daily protein content. Based on the estimated regression coefficients a prediction model for the aforementioned variable was generated. Results. The number of births produced, days in lactation, partial protein production (pm), milk production, quadratic expression for partial protein production am, partial protein production (am) and milking intervals had significant effects (p<0.05) on the total daily protein percentage content. Two models for APTP prediction from a partial sample (am and pm) were generated from these effects. Conclusions. The APTP is affected by various environmental factors that must be adjusted for prediction models. These models can be implemented to adjust data from a partial sample (am or pm) and further adjusted to a reliable average daily protein production in genetic breeding programs.
Authors and Affiliations
Maria C Ceballos B, Zoot *| Fundación CIPAV. Grupo BIOGEM, Medellín, Colombia.Correspondencia: mceballos30@gmail.com, Guillermo Correa L, Ph. D| Universidad Nacional de Colombia. Facultad de Ciencias Agropecuarias, Medellín, Colombia., Julián Echeverri Z, Ph. D| Universidad Nacional de Colombia. Facultad de Ciencias Agropecuarias, Departamento de Producción Animal. Grupo BIOGEM. Medellín, Colombia.
Prevalence of Listeria monocytogenes in pork-meat and other processed products from the Colombian swine industry
Objective. To determine the prevalence of L. monocytogenes in pork carcasses, meat cuts, and meat products (“chorizo”, sausage and ham). Materials and methods. Stratified sampling was implemented in meat-processed produc...
Animal welfare during transport and its relationship with meat quality
Animal welfare is a distinguishing element within the international meat trade, although not part of trade agreements, there are examples of the experiences in Chile, Argentina, Brazil and Uruguay with the European Union...
Navicular disease with axis deviation of the navicular bone in a 33 months old mare
A case of navicular disease with vertical deviation of the longitudinal axis of the navicular bone in a mare pure gauge, 33 months old, from the municipality of Monteria (Cordoba, Colombia), which was detected signs of i...
Estimation of Anadara tuberculosa genetic diversity in five mangroves from Tumaco, using Cytochrome oxidase I enzyme
Objective. To estimate the genetic diversity of the Anadara tuberculosa en five mangrove swams of Tumaco, Nariño, Colombia using as a mitocondrial molecular marker the cytochromo oxidase sub-unit I (COI). Materials and m...
Wooblers syndrome in a horse
A case of Wooblers syndrome is described in a complete male 14-year-old horse from the town of Cereté (Cordoba, Colombia). This condition is also known as equine cervical vertebral stenotic myelopathy (CVSM), which is a...