Recuperacion, germinacion y viabilidad de semillas de especies forrajeras sometidas a la fermentacion ruminal.
1992
Alomar C Daniel | Balocchi L Oscar | Estai M Adolfo | Taladriz C Jaime
The effects of forage species (Subterranean clover, TS; Red clover, TR; Tall fescue, FA; and Italian ryegrass, BI) and fermentation period in the rumen (24 or 48 hours), on seed recovery, germination rate, viability, hard seeds and vigor, were evaluated after rumen fermentation by the in sacco technique, in a rumen fistulated cow, introducing a fixed number of 1,000 seeds in nylon bags (8 repetitions) for each treatment, With a fermentation time of 24 hours, seed recovery (76.3 vs. 72.4% global means) was higher (P >0.01), and dry matter loss (23.9% vs. 32.8) lower (P <0.01), than with 48 hours. Seed recovery was in excess of 98% for grasses, for TS 90% and for TR ca. 10%. Germination rate, viability, hard seeds and vigor of recovered seeds, were expressed as a percentage on the basis of the expression of the same traits for unfermented seeds. Relative germination (i.e normal germinable recovered seeds as a percentage of germinable seeds put to fermentation) and viability for TS, TR, FA and BI, were 2.06 and 15.57, 2.97 and 10.71, 0.26 and 3.49, and 52.02 and 62.96%, respectively, In the same order, mean relative percentage of hard seeds were 98.06, 76.35, 12.81 and 206.57%. Relative vigor was highest for BI (48.63%) and lowest for FA (0.64%). TS and TR showed low values although statistically intermediate (2.94 and 4.02%). All variables were negatively affected with fermentation time (P <0,01), although not all species showed significant effects, which explained significant time x species interactions. FA was more and BI less, affected by fermentation.
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