Caridad-del Rosario, JoaquĆ­n

Profile Picture

Filters

20121
Reset filters

Settings

Citations

Publication Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    Publication
    Consumo voluntario y digestibilidad del heno de pasto pajĆ³n (Diachanthium annulatum) tratado con un complejo enzimĆ”tico y uno nitrogenado
    (2012) Caridad-del Rosario, JoaquĆ­n; Valencia-Chin, Elide; College of Agricultural Sciences; Ramos Santana, Rafael; Randel Folling, Paul; Rilquelme, Ernesto O.; Van Bloem, Skip; Department of Crops and Agro-Environmental Sciences; Ruiz LĆ³pez, Teodoro
    Two experiments were conducted to determine if the chemical composition (CC), in vivo voluntary intake (VI) and digestibility in vivo and in situ degradability of mature Bluestem grass hay (BGH) (Dichanthium annulatum), could be improved by the application of additives. In experiment 1 two additives were used, one of enzymatic nature, DyadicĀ® Cellulase PLUS (ENZ) and the other a nitrogen source, liquid urea (LU). Nine (9) young rams were used in a 3x3 latin square design with the three treatments: BGH without additive (CON), and with added ENZ or LU. The additives were sprinkled over the hay 24 hours prior to being offered at 4 % of the animal body weight (BW) daily. Application of ENZ resulted in no change in CC, VI or digestibility of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid (ADF). But it tended to slightly reduce (p<0.11) NDF content (73.91 vs. 74.27 %), and to increase (p<0.09) ADF content (44.37 vs. 42.87 %). Treatment of BGH with LU increased (p<0.01) the content of CP (8.11 vs. 6.41 %), tended to depress (p<0.11) NDF (73.00 vs. 74.27 %) and increase (p<0.09) ADF (43.17 vs. 42.87 %); it also increased (p<0.01) VI of CP (87 vs. 67 g) and tended (p<0.06) to increase VI of DM (1027 vs. 986 g) and (p<0.10) CP digestibility (61.11 vs. 53.98 %). Daily VI of DM as a percentage of BW was not significantly affected by treatments (3.13, 2.94 and 3.23 % for CON, ENZ and LU, respectively). In two runs of experiment 2, of a complete randomized block design and two factors, the in situ degradability of BGH was evaluated. Three BGH of different maturity: a commercial hay of allegedly 8 weeks regrowth, and two homemade hays of 12 and 24 week regrowth, to which was applied the same enzyme and dosage used as in experiment 1, constituted the first factor. The second factor was time (0, 3, 6, 12, 24 and 48 hours) of incubation in the rumen. In situ disappearance of DM was greatest for the commercial hay at 3 and 6 hours of incubation (21.86 and 24.64 %), while at 12, 24 and 48 hours the 12-week hay was superior (32.42, 46.84 y 56.99 %). The 24-week old BGH was lowest at all incubation times and reached 47.38 % at 48-hour. Disappearance of NDF did not differ among the three BGH at 3 and 6 hours of incubation, but at 12, 24 and 48 hours intervals BGH 12-week old and commercial had higher (p<0.05) respective values 25.43, 38.11, 43.62; and 26.50, 35.42, 43.54 %. The 24-week old BGH was always the lowest and showed a value of 37.97 % after 48 hours in rumen. By contrast, ADF disappearance was not significantly affected by vegetative maturity until48 hours of incubation, when 12-week old BGH demonstrated superiority (p <0.05) (31.10 %), over the commercial (24.74 %) and 24- week old BGH (27.22 %). In conclusion, treatment with the enzyme had no important effect on BGH as evaluated by CC and in vivo criteria, whereas treatment with LU clearly increased CP content of the BGH and VI of CP, thus improving the nutritive value.