Cuantificación de metano entérico según estado fisiológico en vacas lecheras de alta producción en Costa Rica

espanolEsta investigacion cuantifica, mediante la tecnica del SF6, el metano enterico en vacas altamente productoras en una finca comercial. El objetivo fue determinar la emision de metano enterico en vacas Holstein en diferentes estados fisiologicos en un sistema de produccion de leche intensivo bajo pastoreo. Para ello, se seleccionaron 9 vacas Holstein que representaron la conformacion tipica del hato en edad (5,7±0,6 anos), numero de lactancias (3,6±0,4 partos), produccion promedio de leche por lactancia (7924±280 kg leche) y peso (672±36 kg) en diferentes estados fisiologicos: secas (VS), preparto (VPP), primer tercio de lactancia (VPTL) y en medio/final (VM/F) estado de lactacion. Los forrajes y suplementeos proporcionados, previo al ordeno, fueron pesados y muestreados para determinar consumo y digestibilidad de la materia seca. En cada periodo de medicion de metano, se realizaron muestreos de las pasturas y se determino proteina cruda (15,9±0,3%), fibra neutro detergente (63,0±0,9%) y digestibilidad in vitro de la materia seca (67,8±1,9%) del forraje en oferta. La emision diaria de metano por vaca fue similar (p>0,05) en VS, VPP y en VM/F, y mayores (p EnglishThis research quantifies the enteric methane emission in highly productive Holstein cows in a commercial dairy farm, by using the SF6 technique. The objective was to determine enteric methane emission in Holstein cows in different physiological states in an intensive grazing milk production system. Nine Holstein cows were selected which represented the typical conformation of the herd in age (5.7±0.6 years), number of lactations (3.6±0.4 births), average milk production (7924±280 kg) and live weight (672±36 kg), in different physiological states: dry (D), pre-partum (PP), early lactation (EL), and in medium/final (M/F) lactation state. Forages and supplements provided prior to milking were weighed and sampled in order to determine dry matter intake and digestibility (67.8±1.9%). In each methane measurement period, samples were collected from pastures to determine crude protein (15.9±0.3%), neutral detergent fiber This research quantifies the enteric methane emission in highly productive Holstein cows in a commercial dairy farm, by using the SF6 technique. The objective was to determine enteric methane emission in Holstein cows in different physiological states in an intensive grazing milk production system. Nine Holstein cows were selected which represented the typical conformation of the herd in age (5.7±0.6 years), number of lactations (3.6±0.4 births), average milk production (7924±280 kg) and live weight (672±36 kg), in different physiological states: dry (D), pre-partum (PP), early lactation (EL), and in medium/final (M/F) lactation state. Forages and supplements provided prior to milking were weighed and sampled in order to determine dry matter intake and digestibility (67.8±1.9%). In each methane measurement period, samples were collected from pastures to determine crude protein (15.9±0.3%), neutral detergent fiber This research quantifies the enteric methane emission in highly productive Holstein cows in a commercial dairy farm, by using the SF6 technique. The objective was to determine enteric methane emission in Holstein cows in different physiological states in an intensive grazing milk production system. Nine Holstein cows were selected which represented the typical conformation of the herd in age (5.7±0.6 years), number of lactations (3.6±0.4 births), average milk production (7924±280 kg) and live weight (672±36 kg), in different physiological states: dry (D), pre-partum (PP), early lactation (EL), and in medium/final (M/F) lactation state. Forages and supplements provided prior to milking were weighed and sampled in order to determine dry matter intake and digestibility (67.8±1.9%). In each methane measurement period, samples were collected from pastures to determine crude protein (15.9±0.3%), neutral detergent fiber (63.0±0.9%) and in vitro dry matter digestibility. Daily methane emission per cow was similar (p>0.05) in D, PP and in M/F, and higher (p