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Zootecnia Tropical
Instituto Nacional de Investigaciones Agrícolas Venezuela
ISSN: 0798-7269
Vol. 26, No. 3, 2008, pp. 215-218
Bioline Code: zt08031
Full paper language: Spanish
Document type: Research Article
Document available free of charge

Zootecnia Tropical, Vol. 26, No. 3, 2008, pp. 215-218

 es Cambios Nutricionales en Dos Fenofases de Arbustos Forrajeros
Hernández C., Hugo E.; González G., Héctor; Ramírez O., Rafael; Ramírez O., Juan M.; Cepeda P., Ramón & Torres S., Fernando

Resumen

Los cambios nutricionales en los arbustos de ramoneo, durante sus fenofases, impactan directamente la productividad de los rumiantes que los consumen, por lo que es necesario monitorear éstos y aplicar criterios prácticos en su aprovechamiento racional y sostenible. Con este objetivo, se muestrearon nueve especies de arbustos forrajeros en sus fases de floración y fructificación a las que se les determinó fibra detergente ácido (FDA) y neutro (FDN), digestibilidad (D), índice de consumo (IC) y su valor forrajero relativo (VFR). Se utilizaron cuatro muestras con tres repeticiones por fenofase y estadísticamente como un diseño completamente al azar. Para la época de floración, la FDN fue 41,3 36,5 33,6 45,2 35,8 32,3 33,6 41,9 y 45,7 para Acacia peninsulares check for this species in other resources (Ap), Cercidium floridum check for this species in other resources (Cf), Mmimosa xantii check for this species in other resources (Mx), Pithecellobium confine check for this species in other resources (Pc), Prosopis check for this species in other resources sp (Ps), Bursera microphylla check for this species in other resources (Bm), Cyrtocarpa endulis check for this species in other resources (Cc), Opuntia cholla check for this species in other resources (Och) y Turnera difusa check for this species in other resources (Td), respectivamente. En la época de fructificación, los valores de FDN fueron 37,2 30,4 34,1 40,7 36,2 54,2 40,8 37,5 y 56,1, respectivamente; FDA fueron 28,2 24,1 27,9 32,1 22,8 24,2 22,9 20,7 y 33,7, respectivamente, mientras que en fructificación fueron 29,3 21,7 30,5 33,7 22,9 48,7 34,5 20,9 y 47,4, respectivamente, para la misma secuencia de especies indicada anteriormente. Se encontraron diferencias entre especies (P<0,01) y entre fenofases (P<0,05). La digestibilidad vario en rangos de 62 a 73% y de 50 a 71% para floración y fructificación, respectivamente; IC fue superior al 2,1% de consumo de peso vivo; VRF para la época de floración fue 150, 178, 185, 131, 184, 201, 196, 161 y 127 para Bm, Cc, Mx, Ps, Cf, Och, Ap, Pc y Td, respectivamente, mientras que en la época de fructificación se obtuvieron valores 165, 220, 177, 143, 182, 87, 141, 180 y 86 para Cf, Ps, Och, Mx, Ap, Pc, Cc, Bm y Td, respectivamente.

Palabras-clave
fenofases, floración, fructificación, arbustos.

 
 en Nutritional Changes in Two Phenophases of Fodder Shrubs
Hernández C., Hugo E.; González G., Héctor; Ramírez O., Rafael; Ramírez O., Juan M.; Cepeda P., Ramón & Torres S., Fernando

Abstract

Nutritional changes in the browsing shrub during their phenophases exert direct impact on the productivity of ruminants that consume them. This is a reason why it is necessary to monitor these shrubs and to carry out practical approaches for their rational and sustainable utilization. With this in mind, there were sampled nine fodder shrub species in their blooming and fructification stages to determine acid (ADF) and neutral (NDF) detergent fiber contents, and the digestibility (D), consumption index (CI), and its relative forage value (RFV). Four samples with three replicates for phenophase were statistically analyzed in a completely randomized design. For the blooming stage, NDF values were 41.3, 36.5, 33.6, 45.2, 35.8, 32.3, 33.6, 41.9, and 45.7 for Acacia peninsulares check for this species in other resources (Ap), Cercidium floridum check for this species in other resources (Cf ), Mmimosa xantii check for this species in other resources (Mx), Pithecellobium confine check for this species in other resources (Pc), Prosopis check for this species in other resources sp. (Ps), Bursera microphylla check for this species in other resources (Bm), Cyrtocarpa endulis check for this species in other resources (Cc), Opuntia cholla check for this species in other resources (Och), and Turnera difusa check for this species in other resources (Td), respectively. In the fructification stage, NDF values were 37.2, 30.4, 34.1, 40.7, 36.2, 54.2, 40.8, 37.5, and 56.1 respectively; ADF was 28.2, 24.1, 27.9, 32.1, 22.8, 24.2, 22.9, 20.7 and 33.7, respectively, while in fructification stage was 29.3, 21.7, 30, 5, 33.7, 22.9, 48.7, 34.5, 20.9, and 47.4, respectively. Differences among species (P <0.01) and among phenophases (P <0.05) were found. The digestibility varied in ranges of 62-73% and 50-71% for blooming and fructification stages, respectively. CI was greater than 2.1% of consume of live weight, RVF at blooming time was 150, 178, 185 , 131, 184, 201, 196, 161 and 127 for Bm, Cc, Mx, Ps, Cf, Och, Ap, Pc and Td, respectively, while at fructification stage values were 165, 220, 177, 143, 182, 87, 141, 180, and 86 for Cf, Ps, Och, Mx, Ap, Pc, Cc, Bm, and Td, respectively.

Keywords
Phenophases, blooming, fruiting, shrubs.

 
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