Daily variations of forage allowance, effects on milk production and quality
Journal Title: Revista MVZ Cordoba - Year 2011, Vol 16, Issue 3
Abstract
Objective. To determine the effects of daily forage allowance variations on production and milk quality. Materials and methods. This study took place in five commercial farms and included two periods of observation. The daily forage intake was estimated through agronomic difference, measuring the daily area of allowance with a GPS and using the Doubled Sampling Technique to estimate biomass yield and the remaining herbage after pasture defoliation. Variations for each parameter were estimated within and between farms in order to determine its magnitude, relationships between daily herbage allowance and forage intake, and its influence on milk yield and composition during both periods of observation. Results. There was an association between daily herbage allowance and variation on daily forage intake (r2=0.65) as for variation on daily milk yield (r2=0.45). Daily variation on milk fat showed no direct relationship with daily herbage allowance, but its values were associated with forage to supplement ratio (r2=0.52). Relation between daily variation of milk protein and daily herbage allowance was low (r2=0.17), but higher between protein concentration and forage dry matter intake (r2=0.34). Conclusions. The results suggest that variation on daily herbage allowance explained largely the variations on dry matter intake, leading to a direct effect on milk yield, but explain little the variations on milk fat and milk protein.
Authors and Affiliations
César Mendoza F, Zoot| Universidad Nacional de Colombia, Facultad de Medicina Veterinaria y de Zootecnia, Departamento de Ciencias para la Producción Animal, Grupo de Investigación en Nutrición Animal., Martha Pabón R, Ph. D| Universidad Nacional de Colombia, Facultad de Medicina Veterinaria y de Zootecnia, Departamento de Ciencias para la Producción Animal, Grupo de Investigación en Nutrición Animal.Departamento de Química, Facultad de Ciencias. Bogotá, Colombia., Juan Carulla F, Ph. D *| Universidad Nacional de Colombia, Facultad de Medicina Veterinaria y de Zootecnia, Departamento de Ciencias para la Producción Animal, Grupo de Investigación en Nutrición Animal.Correspondencia: jecarullaf@bt.unal.edu.co
Keywords
Related Articles
- EP ID EP3222
- DOI -
- Views 359
- Downloads 17
GROWTH AND MORTALITY OF MONCHOLO (Hoplias malabaricus) IN THE CIENAGA GRANDE DE LORICA, COLOMBIA
Growth and mortality parameters of moncholo (Hoplias malabaricus) were estimated by using ELEFAN to the information collected between january to december 2000. The estimated values for asymptotic length (L¥), growth coef...
EVALUATION OF MILK QUALITY IN FOUR PROCESSORS OF CHEESE IN THE MUNICIPALITY OF MONTERIA, COLOMBIA
Objective. To evaluate the physical, chemical and bacteriological quality of the crude milk from four cheese companies factories in Monteria city. Materials and methods. To each one of the suppliers of these companies, m...
STRUCTURAL ANALYSIS OF BEEF AND HAM DURING THE COOKING PROCESS AND STORAGE TEMPERATURE
Objetive: To determine the structural changes on the pork ham by effect of the cooking process and the temperature of storing. Materials and methods. Six treatments were made, in those three internal temperatures were us...
Associations between copper concentrations in liver and serum and ceruloplasmin in serum from horses
Objective. The aim of this study is to determine the reference intervals and the associations between the concentrations of liver and blood serum copper (Cu) and serum ceruloplasmin (Cp) in horses. Materials and Methods....
Activation and comparative kinetics of Ovis aries plasmin with human plasmin
Objective. Compare the kinetics and activations, unify the purifications methods and establish the sequence of the N-terminals of the plasminogens human and Ovis aries. Materials and methods. The plasminogens were purifi...