Abstract
Ruminal degradability of dry matter, neutral detergent fiber and acid detergent fiber of cultivars Stylozanthes guianensis (Mineirão) and Stylozanthes spp. (Campo Grande) were evaluated. Two incubations in rumen-fistulated adult bovine females were undertaken. Each incubation comprised of 25 samples of 7.0 g of each cultivar and samples were collected at 0, 6, 9, 12, 24, 36, 48, 72 and 96 hours after incubation. At a 5%/hour passage rate, Stylozanthes guianensis had 75.70, 59.01 and 76.81% effective degradability for dry matter, neutral detergent fiber and acid detergent fiber, respectively, whereas Stylozanthes spp. had 68.39, 51.93 and 58.89% for the same fractions. The lag time was different (P<0.05) only for acid detergent fiber. Stylozanthes guianensis presented higher ruminal degradability in dry matter and fiber fraction when compared to those by Stylozanthes spp. The decision to adopt one or another cultivar depends on studies that take into account the cost of deployment and maintenance of leguminous cultivar and its assets.
Highlights
The Brazilian savannah comprises approximately 21% of the countrys area
Degradability equations followed the model by Orskov and McDonald (1979): Dg = A – B . ect (1), where: A is maximum degradation rate of the material contained in a nylon bag; B is a parameter without biological value of interest
If there were no lag time, it would be equivalent to the total that would be degraded by microorganisms; c is the constant degradation rate of the fraction in the nylon bag and t is the incubation time in the rumen
Summary
The Brazilian savannah comprises approximately 21% of the countrys area. Stylosanthes are, as a rule, adapted to acid and low fertility soils, even though they show high responses to fertilizers. The cultivar Stylozanthes guianensis (mineirão) was commercially launched in 1993 by the Brazilian agricultural research company EMBRAPA. The cultivar is characterized by herbaceous sub-shrub size, semi-erect or erect growth, good adaptation to acid and low fertility soils, high leaf retention during the dry season, late flowering and resistance to anthracnose (Barcellos et al, 2008; Karia et al, 2010). Cultivar Campo Grande plants are well adapted to sandy soils, with good endurance under grazing, natural high seed production, low cost seeds and tolerance to anthracnose (Embrapa, 2007; Barcellos et al, 2008).
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