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Estimation of genetic parameters and selection of elephant-grass ( Pennisetum purpureum Schumach.) for forage production using mixed models
The efficient use of fodder and grassland as the basis of animal feed represents a way of raising productivity and reducing production costs. In this scenario, elephant-grass stands out among the most used forages in the intensive animal production systems in the world mainly due to its high product...
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Published in: | Chilean journal of agricultural research 2019-08, Vol.78 (2) |
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Main Authors: | , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | The efficient use of fodder and grassland as the basis of animal feed
represents a way of raising productivity and reducing production costs.
In this scenario, elephant-grass stands out among the most used forages
in the intensive animal production systems in the world mainly due to
its high productive potential, support capacity and nutritional
quality. The purpose of this work was to estimate genetic parameters
for the selection of elephant-grass (Pennisetum purpureum Schumach.)
clones for forage production in two seasons, a period of water
restriction and the total period of study. We evaluated 80 accessions
of elephant-grass by means of the mixed-models methodology (REML/BLUP).
The evaluation of DM yield (DMY) of the different genotypes were
executed in edaphoclimatic conditions in Campos dos Goytacazes, Rio de
Janeiro, Brazil. The Selegen-REML/BLUP software accomplished the
statistical and genetic analyses. It was seen that the DMY trait was
with a low estimate of coefficient of genotypic variation (3.08%),
which demonstrates possible difficulties with the selection for this
trait. Heritability-coefficient estimate was 0.3606 for the dry season
and 0.4193 for the total period. Those results were the variation in
that trait due to genetic causes. Although those values may not be
considered of high magnitude, they are of great interest for the
breeding mainly because it is a polygenic trait. In both periods,
genotypes 7, 25, 41, 43, 57, 58, 62, 64, 68, and 77 stood out among the
others, since it presented the highest genetic gains for DMY, which
will enhance progress in the evaluated trait. |
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ISSN: | 0718-5820 |