Produção e composição bromatológica de cultivares de milheto forrageiro sob alturas de crescimento e residual
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Data
2010-03-22
Autores
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Universidade Federal de Goiás
Resumo
The best height of forage at time of entry into pasture and the height of forage
millet residue for grazing are still controversial. This experiment was conducted at
the Department of Animal Production of the Veterinary School, of Federal
University of Goias, in Goiania-GO, from January to May 2009, and aimed to
evaluate the productive potential and the chemical composition of three cultivars of
forage millet (Pennisetum glaucum (L.) R. BR.) under different heights of entry and
of the stubble. The 27 treatments consisted of the combinations of three varieties
of millet - ADR 500, H733/07 and H729/07, allocated in plots, three heights at
entry (0.50, 0.60 and 0.70 m) and three heights of stubble (zero, 0.10 and 0.30 m)
allocated in sub-plots with four replications, totaling 108 experimental units. A
randomized complete block design, with split plots andfour replications in a 3 x 3 x
3 factorial arrangement was used. Green matter total yield (GMTY), dry matter
total yield (DMTY), average production of dry matter per cutting, production of dry
matter of stubble with zero, 0.10 and 0.30 m, average rate of forage accumulation,
and rate of forage accumulation of stubble "zero" 0.10 and 0.30 m were
determined. The contents of crude protein (CP), neutral detergent fiber (NDF) and
acid detergent fiber (ADF) were also determined. Green matter total yield (GMTY)
differed depending on the height at entry (HE) and height of stubble, with average
values of 25.2: 28.0 t ha-1 and 28.5 and 20.4; 30.6 and 30.7 t ha-1, estimated for
the HE and stubble, respectively. The dry matter production increased in the
extent that the height at entry and the height of the stubble increased. The
average production of dry matter per cutting for the cultivars was approximately
2840 kg ha-1/DM. The average accumulation of forage millet was 61.74, 58.29
and 63.59 kg ha-1/DM for cultivars ADR-500, ADR-500 hp, 729 and 733,
respectively. Regarding chemical composition, the dry matter content did not differ
among the cultivars evaluated. The CP did not differ in function of the cultivars and
HE. The residue of 0.10 and 0.30 m, interactions among cultivar x HE x cutting,
averaging 14.0% of CP were observed. The NDF had triple interaction: cultivar x
HE x cutting in the stubbles of 0.10 and 0.30 m, with average values of 57.6, 58.6
and 57.7%, and 58.4, 61, 6 and 57.7%, respectively. ADF differed in relation to the
cultivars, with values of: ADR-500-35- 5, 729 - 37.6 and 733 - 37.9%. As for the
residue of 0.10 m, there was an interaction in relation to HE x cutting, with values
of 30.0, 31.7 and 25.8% for the HE of 0.50, 0.60 and 0.70 m. As for the residue of
0.30 m triple interactions were observed: HE x cultivar x cutting, with average
rates of (ADR-500) - 31.7%, (729) - 32.0%, and (733) - 32.7%, respectively. Based
on the values of dry matter and chemical composition, all cultivars showed
potential for use in animal feed.
Descrição
Palavras-chave
1. FDA , 2. FDN , 3. Forragem , 4. Manejo , 5. (Pennisetum glaucum (L.) R.Br.) , 6. Proteína bruta e rendimento forrageiro , 1. ADF , 2. Crude protein , 3. Forage management , 5. Forage yield , 6. NDF , 6. (Pennisetum glaucum (L.) R.Br.) , 1. Pennisetum glaucum-produção-avaliação
2. Milheto - composição bromatológica
Citação
BASTO, Débora de Carvalho. Production and chemical composition of forage millet cultivars in times of growth and residual. 2010. 84 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2010.