Year-end Sale % OFF 
Abstract
The objective of this study was to estimate genetic parameters for agronomic traits and nutritional value in intraspecific hybrids of B. decumbens. For this, a population of 1,415 hybrids was evaluated in field plots at Embrapa Beef Cattle in Campo Grande/MS/Brazil, with seven clippings in order to estimate field green weight (FGW); total dry matter (TDM); speed of regrowth (SR); tiller regrowth density (TRD); regrowth ability (REG); crude protein (CP); in vitro organic matter digestibility (IVD); neutral detergent fiber (NDF) and lignin (LIG). The statistical analyses were carried out using the mixed models methods. Genetic variability for all traits assessed was detected, and estimates of individual heritability were of medium to high magnitude, indicating the possibility of gains with selection. Significant genetic correlations were observed between FGW and TDM (0.99), TDM and SR (0.81), TDM and IVD (-0.71), TDM and LIG (0.71), and CP and IVD (0.70).
Highlights
The need for new cultivars of tropical forages to better comply with the demands of the livestock sector has influenced and stimulated the development of breeding programs for the most important commercial species (Valle et al 2009, Alves et al 2013)
These programs constantly search for new genotypes that simultaneously combine agronomic performance, nutritional value and resistance to pest and diseases that surpass the standards of the existing cultivars in the market (Jank et al 2014)
These progenies, unprecedented in the world, granted the opportunity to exploit the genetic variability in B. decumbens by means of recombination and selection, in order to increase the frequency of favorable alleles for the main traits
Summary
The need for new cultivars of tropical forages to better comply with the demands of the livestock sector has influenced and stimulated the development of breeding programs for the most important commercial species (Valle et al 2009, Alves et al 2013). A diploid accession of this species was duplicated using colchicine, resulting in three sexual and tetraploid plants (Simioni and Valle 2009), which allowed for intraspecific crosses and for the attainment of a base population of 457 hybrid progenies (Jank et al 2011) These progenies, unprecedented in the world, granted the opportunity to exploit the genetic variability in B. decumbens by means of recombination and selection, in order to increase the frequency of favorable alleles for the main traits
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
