O. Prado, Jesús B. Morales, Jaime O. Molina, Luis M. García, Rafael B. Macedo, J. R. Hernández, Arturo César García Casillas
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引用次数: 2
Abstract
The aim of this study was to assess the relationship between biochemical analytes and milk fat/protein in high-yield (DIM: 42 ± 10 d postpartum) and low-yield (DIM: 91 ± 11 d postpartum) Holstein cows. Stepwise regression analysis was used to evaluate the relationships of biochemical analytes with the fat and protein content of the milk from 126 Holstein cows belonging to nine intensive housed dairy farms. The comparison between the two groups showed differences ( P< 0.05) in the milk yield, milk fat and milk fat/protein ratio, with the higher values in high-yield cows. The correlations between milk fat, milk protein, milk fat/protein ratio and biochemical analytes concentrations, were assessed within each group. Milk fat level was positively correlated to cholesterol, triglycerides, β-hydroxybutyrate and albumin in high-yield cows. Milk protein level was positively correlated to urea, and negatively correlated to sodium ion, potassium ion and chlorine ion in high-yield cows. A virtually linear dependence has also been found between milk fat and triglycerides, between milk protein and urea, and between milk fat/protein ratio and cholesterol, and triglycerides in low-yield cows. The metabolic profiles provide a practical tool, to present an insight into the underlying physiological mechanisms of lactation, and the identification of relationships between key analytes and components of milk, such as protein and fat content. Key words : dairy cow, blood chemistry, milk fat, milk protein.
期刊介绍:
Austral Journal of Veterinary Sciences (formerly Archivos de Medicina Veterinaria) publishes original scientific contributions in English, containing the latest developments and discoveries in veterinary sciences. The journal covers topics such as animal health and production, preventive medicine, zoonosis, pharmacology and therapeutics, methods of diagnosis, and other areas related to the veterinary field.
Austral Journal of Veterinary Sciences aims to divulge information about advances in veterinary medicine among universities, research centres, industries, government agencies, biologists, agronomists and veterinarians.