Degradabilidad ruminal de la alfalfa en la zona oriental del Valle Central de Costa Rica

Abstract

The objective of this work was to evaluate in dairy cows, the potential of ruminal degradability of four alfalfa (Medicago sativa) varieties developed in Argentina. The research was carried out in the Alfredo Volio Mata Experimental Station, located in the province of Cartago, Costa Rica; the area has a mean temperature of 17.9°C; a height of 1542 masl, and 1465.9 mm of rain evenly distributed between the months of May and November. Sampling was performed during 2014’s rainy season with ground level harvest of alfalfa, with samples of the varieties of Mora, Patricia, Victoria and Super Monarca, with harvest age of 28, 35, 42, 49, 56 and 63 days; all samples were dried, minced and incubated by duplicate on two Jersey-Reyna ruminally fistulated cows, for 0, 3, 6, 12, 24 and 48 hours. The results were analyzed through the Marquardt algorithm with the SAS software. Statical differences were only found between soluble fraction and degradation rate (p<0.05) according to harvest ages, with values of soluble, potentially degradable and degradation rate of 35.34%-44.65%, 36.46%-39.96% and 0.0734/h-0.1176/h, respectively. Likewise, effective degradability percentages of 59.06%-67.09%, with passage rates of 6%/h, according to harvest ages were obtained. Given the obtained results, the analyzed varieties of M. sativa showed a digestible forage, which could be used for the feeding of highly production animals.

Efecto de la edad de rebrote en la degradación ruminal del pisonay (Erythrina sp) en el valle interandino de Abancay

“…Con respecto a los 120 días fue similar al obtenido en la Erythrina sp (Cárdenas et al, 2016) y E. poeppigiana (Benavides, 1998) que fueron evaluadas en zona húmedas, a su vez fue menor al comparar con la Erythrina sp que a los 365 días fue 31.7% (Ramos, 2009), y superior a valores hallados en la Erythrina edulis (Naranjo y Cuartas, 2011), Erythrina variegata (Alvear, Melo, Apráez, Gálvez y Insuasty, 2013), Erythrina peruviana (Valarezo y Ochoa, 2013) y Erythrina subumbrans (Vivasane y Preston, 2016) evaluadas en condiciones de bosques húmedos y amazónicos.…”

“…Por otro lado, la FDA en el pisonay en ambos días de rebrote resultan ser menores (Benavides, 1998, Flores et al, 1998y Suárez et al, 2008 y similar con respecto a la E. abyssyinica y E. brucei (Yisehak y Janssens, 2013). La HEM fue menor y la CEL similar a los reportes de Larbi et al (1996).…”