Ossival Lolato Ribeiro

Growth performance, carcass characteristics and meat quality of finishing bulls fed crude glycerin-supplemented diets

ABSTRACT This study was conducted to evaluate the performance, carcass characteristics and chemical composition of Longissimus muscle (LM) of the bulls. Twenty-four Nellore bulls were used in a complete randomised design. The bulls were randomly assigned to one of the three diets containing 0, 5 or 12% glycerin. Final BW and ADG were similar (P>0.05) between the bulls fed with 5 or 12% of glycerin but were higher (P 0.05) by glycerin level. Hot carcass weight increased (P 0.05) the conformation, colour, texture, marbling and pH. There was difference (P>0.05) for moisture, ashes and crude protein among glycerin levels. Bulls fed 12% glycerin present the highest (P<0.03) total lipids on LM. The percentage of saturated fatty acids (SFA), monounsaturated acids (MUFA), polyunsaturated acids (PUFA), n-6 and n-3 fatty acids and PUFA/SFA and n-6:n-3 ratios of the LM were similar among the diets. In conclusion, glycerin level did not affect the animal performance and carcass characteristics of Nellore bulls finished in feedlot. Key words: cattle, fat, glycerin, human health, silage corn

Produtividade do milho em resposta a adubação com NPK e Zn em argissolo vermelho-amarelo eutrófico e latossolo vermelho eutroférrico

Objetivando-se avaliar os componentes de producao e a produtividade da cultura do milho em funcao da adubacao, com diferentes doses de Zn (Zinco), e NPK (nitrogenio, fosforo e potassio), realizou-se este trabalho nos municipios de Palotina - PR, em Argissolo Vermelho - Amarelo eutrofico e Marechal Cândido Rondon - PR, em Latossolo Vermelho eutroferrico. Os tratamentos foram arranjados em esquema fatorial 3x3 constituindo tres doses de adubacao NPK: sem adubacao; uma vez (30-100-50 kg ha-1), e duas vezes a recomendacao de adubacao (60-200-100 kg ha-1), com base na analise do solo. Outro fator em estudo foi o Zn, em diferentes doses: 0,0; 5,0 e 10,0 mg dm-3. As parcelas corresponderam a 3,6 m de largura por 6 m de comprimento. Foram semeadas 4 linhas espacadas com 0,9 m, utilizando-se como parcela util as 2 linhas centrais, descartando-se 1,5 m de bordadura. A populacao de plantas foi de 6,5 sementes, por metro linear. Com relacao a adubacao de NPK (nitrogenio, fosforo e potassio), obteve-se aumento significativo para os componentes: numero de graos, massa de 1000 graos e a produtividade, sendo a dose 60-200-100 kg ha-1 a que proporcionou os melhores resultados no Latossolo Vermelho eutroferrico e no Argissolo Vermelho-Amarelo eutrofico, proporcionou aumento significativo na massa de 1000 graos e na produtividade. Em relacao a adubacao com o Zn, nao obteve-se aumento significativo, nos dois solos, entre os tratamentos para os componentes avaliados e a produtividade. Com este trabalho, pode-se concluir que a adubacao com NPK aumentou a produtividade da cultura nos dois solos e na adubacao com Zn nao se obteve diferencas de produtividade, para a cultura do milho.

Morphogenetic and tillering dynamics in Tanzania grass fertilized and non-fertilized with nitrogen according to season

The objectives of this study were to evaluate morphogenetic characteristics and tillering dynamics in Tanzania grass fertilized and non-fertilized with nitrogen, under intermittent grazing, in the spring and the summer. The main plots were composed of four nitrogen rates (0, 100, 200 and 300 kg/ha) and the subplots were growth seasons: spring (October, November and December) and summer (January, February and March). The experimental design was of randomized block with plots subdivided by time (seasons of the year) and four replications. Urea was used as nitrogen supply and was divided into two applications: one in the spring and another in the summer. The experimental units fertilized with N rates of 200 and 300 kg/ha showed six cycles of pasture, with an average of 27 days of pasture interval, while the treatments with no fertilization and 100 kg/ha of N showed only four and five cycles of pasture, respectively. Leaf elongation rate (LER) and the leaf appearance rate (LAR) increased linearly with increasing of N rates. The greatest population density occurred in summer with the higher nitrogen rates. The treatment without N fertilization showed the lowest growth of tiller population, while the other treatments exhibited growth rates above 50% when compared with non-fertilized samples. Nitrogen rates significantly affect the leaf appearance rate and the leaf elongation rate, as well as the number of live leaves in plants of Tanzania grass in both spring and summer.