Evaluation of growth and microhistological characteristics of Panicum coloratum and Urochloa brizantha under cutting frequencies based on leaf lifespan
DOI:
https://doi.org/10.30550/j.lil/2173Keywords:
Defoliation; in-sacco degradability; nutritional quality; remnant tissues; C4 forages.Abstract
The displacement of livestock farming towards subtropical areas has increased interest in understanding growth patterns and anatomical characteristics that determine the nutritional quality of megathermic pastures under different management strategies. The objective of this study was to evaluate the impact of two cutting frequencies based on average leaf lifespan values, on the growth and nutritional quality of Panicum coloratum and Urochloa brizantha at individual plant and canopy scales. At the individual level, eight plants of each species were established in 10-liter pots. At the canopy level, eight plots of 9 m2 were established, four of U. brizantha and four of P. coloratum. A completely randomized design with two cutting frequencies and four replicates (n=4) was employed. Two cutting treatments based on leaf lifespan (LLS) were applied: Control Frequency (FT, 100% LLS) and High Frequency (AF, 50% LLS). Quality was estimated by ruminal post-incubation microhistology. The frequency of defoliation modified the structure, forage supply and histological characteristics, influencing nutritional quality, exhibiting differential patterns between species. An earlier defoliation than the LLS resulted in lower forage supply, but with a rapidly degradable leaf tissue, which was more usable by ruminal microorganisms, implying improved quality. Tiller density increased in P. coloratum and decreased in U. brizantha, although this effect was not sustained over time, possibly due to limitations in environmental resources. This information provides an approximation to understanding the relationship defoliation frequency and quality, which will allow establishing management strategies for these species according to their intended productive objective.
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