Tesis
Desempenho de bovinos de corte e indicadores qualitativos de capim-marandu em sistemas integrados
Fecha
2019-07-19Registro en:
CARVALHO, Perivaldo de. Desempenho de bovinos de corte e indicadores qualitativos de capim-marandu em sistemas integrados. 2019. 94 f. Tese (Doutorado em Agricultura Tropical) - Universidade Federal de Mato Grosso, Faculdade de Agronomia e Zootecnia, Cuiabá, 2019.
Autor
Cabral, Luciano da Silva
Pedreira, Bruno Carneiro e
http://lattes.cnpq.br/2484913274684376
http://lattes.cnpq.br/8009596890587747
Cabral, Luciano da Silva
019.711.357-55
http://lattes.cnpq.br/8009596890587747
Pedreira, Bruno Carneiro e
791.490.575-53
http://lattes.cnpq.br/2484913274684376
019.711.357-55
791.490.575-53
Toledo, Cláudio Luiz Barbosa de
648.394.001-72
http://lattes.cnpq.br/8483768210438413
Nascimento, Hemython Luis Bandeira do
884.426.912-00
http://lattes.cnpq.br/8764134354447154
Gomes, Fagner Junior
228.797.518-70
http://lattes.cnpq.br/5980169341086721
Silva, Lilian Chambó Rondena Pesqueira
008.485.321-20
http://lattes.cnpq.br/3350073241147905
Institución
Resumen
Brazil is responsible for much of the world's meat and grain
production, directly contributing to global food security. And, intensification of
production systems can expand this potential, mainly through integrated systems. In
this perspective, two studies were carried out, the first to evaluate forage production
and nutritive value and the second to evaluate the animal performance of beef cattle
in integrated systems. The experiment was carried out in a randomized block design
with four replicates. The treatments were four production systems in two seasons.
The systems were: livestock (L); livestock-forestry (LF) integration with palisadegrass
and triple lines of eucalyptus trees; crop-livestock integration (CL); and croplivestock-forestry (CLF) integration with simple eucalyptus lines. The seasons were
defined by dry and rainy period. Forage production and animal performance was
evaluated from July 2016 to July 2017, the nutritive value by grazing simulation was
evaluated from September 2015 to March 2017. For animal performance, Nellore
steers with initial weight of 345 ± 8.0 kg were managed under continuous stocking
and variable rate. Forage mass (FM) and accumulation (FA) were quantified every 28
days. Greater FA were observed in the systems (CL and CLF). The individual body
weight (BW) gain were similar among systems (0.690 kg BW day-1). However, the
gain per area differed, where the LPF was 28% greater than the others, which
presented an average of 932 kg BW ha-1. FA and FAR (forage accumulation rate) did
not differ between CL and CLF, but both were 21% greater than L and LF. Similar
pattern was observed in total forage accumulation, where crop-preceded systems
(CL and CLF) were 22% greater than L and LF. Leaf ratio and leaf:non-leaf ratio
were not affected by systems, averaging 90.4 g g-1 MS and 14.6 g g-1 MS. Crude
protein (CP) was affected by the systems, with similar concentrations in CLF and LF.
However, CLF presented CP 8% greater than L and 14% greater than CL. Neutral
detergent fiber (NDF) and acid detergent fiber (ADF) were not affected by the
systems, averaging 59.2 and 27.5%, respectively. Forage total carbon (TC), nitrogen
stock (N) and total carbon accumulation (ATC) were affected by systems. The ATC in
CL was similar to CLF and 23% greater than the average of L and LF systems. In
addition, the TC in CL was 11% greater than L and CLF and 33% greater than LF.
The N stock in the LF was 22% lesser than the average of the L, CL and CLF
systems (78.9 kg N ha-1). Based on our results, integrated systems are alternatives
for intensifying pasture animal production and the addition of the forestry component
contributes to animal productivity and carbon stock, ensuring better nutritional value
and sustainability of the production system.