Medidas corporales y concentración sérica y folicular de lípidos y glucosa en vacas Brahman fértiles y subfértiles

Abstract

Resumen -El objetivo de este estudio fue evaluar las diferencias en las medidas corporales en vacas Brahman fértiles y subfértiles, establecer las diferencias en la concentración de colesterol, lipoproteínas y glucosa en suero y líquido folicular, y desarrollar un modelo para predecir subfertilidad en vacas Brahman a partir de las medidas corporales. Se seleccionaron vacas Brahman registradas, agrupadas en fértiles (15) y subfértiles (15) según historial reproductivo. Se tomaron muestras de suero y líquido folicular (diámetro >8 mm) para determinar colesterol, lipoproteínas, triacilgliceroles y glucosa. Las vacas subfértiles mostraron un fenotipo masculino, con medidas corporales mayores, y concentraciones de colesterol y HDL séricos y foliculares más bajas que las vacas fértiles. El colesterol y el HDL se correlacionaron positivamente entre los compartimientos en ambos grupos. La subfertilidad es más probable en vacas pesadas con hombros amplios y mayor perímetro torácico. El tamaño corporal en vacas Brahman subfértiles se relacionó con su apariencia, con cambios en los metabolitos séricos y foliculares y con las concentraciones de colesterol y HDL.Términos para indexación: Cebú, fertilidad, medición del cuerpo, metabolismo. Body measurements and serum and follicular concentrations of lipids and glucose in fertile and subfertile Brahman cowsAbstract -The objective of this study was to evaluate differences in body size among Brahman cows, grouped according to their fertility, to establish differences in concentrations of cholesterol, lipoproteins, and glucose, in serum and follicular fl uid, and to develop a model to predict subfertility in Brahman cows using body measurements as predictors. Registered Brahman cows were selected and grouped in fertile (15) and subfertile (15) animals, according to their calving interval. Samples of blood serum and liquid from follicles (diameter >8 mm) were collected in order to determine cholesterol, lipoproteins, triacylglycerols, and glucose. Subfertile cows had a masculine phenotype, their body measurements were larger than those in fertile cows, and they had lower cholesterol and HDL concentrations in serum and follicular fl uid. Cholesterol and HDL between compartments were positively correlated in both groups. Subfertility is more probable in heavier cows with wider shoulders, and larger thoracic perimeter. Body size in subfertile Brahman cows was related to their appearance, and to changes in serum and follicular cholesterol and HDL concentrations.

Different roughage to concentrate ratios in extruded ration and metabolic parameters of growing lambs

“…The low ether extract content in the extruded feed (Table 1) may have influenced the reduction of the concentration of these metabolites in the blood. Villa, Pulgarín, Tabares, Angarita and Ceballos (2009) stated that plasma total cholesterol levels are adequate indicators of total plasma lipids and have a direct relationship with the animal's diet. Kaneko, Harvey and Bruss (2008); ** Reference values described by Ghoreishi, Zamiri, Rowghani and Hejazi (2007) and Espinoza, Palacios, Ortega and Guillén (2008); CHOL: cholesterol (mg dL -1 ); TRI: triglycerides (mg dL -1 ); HDL: high-density lipoprotein (mg dL -1 ); LDL: low-density lipoprotein (mg dL -1 ); VLDL: very low-density lipoprotein (mg dL -1 ); CT/HDL: relationship between cholesterol and high-density lipoprotein; LDL/HDL: relationship between low-density lipoprotein and high-density lipoprotein; FRUCT: fructosamine (µmg dL -1 ); CV: coefficient of variation; 1 Y = 27.328566 + 0.357717x -0.003349x 2 , R 2 = 47.39%; 2 Y = 18.251087 + 0.071204x, R 2 = 70.83%; 3 Y = 2.651463 + 0.009849x, R 2 = 88.06%; 4 Y = 1.572572 + 0.006991x -0.000103x 2 , R 2 = 52.90%; 5 Y = 264.635325 -1.014425x, R 2 = 63.24%.…”