Inclusão de grãos de girassol na ração de cordeiros sobre as características quantitativas da carcaça e qualitativas da carne

This study aimed to evaluate the carcass quantitative characteristics, tissue composition of carcass cuts and meat quality of lambs receiving sunflower seeds in the diet. Twenty-one lambs 7/8 Ile de France 1/8 Ideal, not castrated, with initial body weight of 17 kg were housed in individual pens and distributed in three diets (0,7.5 and 15% of sunflower seeds inclusion) in a completely randomized design in 3 x 2 factorial arrangement (three diets and two carcass cuts). At the end of the experimental period, the animals were slaughtered; weights and hot and cold carcass yields and commercial and biological carcass dressing were collected. The carcasses were split lengthways and left half carcass divided into six anatomical parts. The leg and loin were removed for evaluation of tissue composition, meat color, water holding capacity, cooking losses and shearing force. Difference was detected in the commercial carcass yield; with higher value (46.82% of total weight) for carcasses of lambs fed without sunflower seeds when compared with carcass yield (44.11%) of lambs fed with 15% of sunflower seed inclusion. The proportion of muscle and total fat, as muscle:fat ratio were affected (P<0.05) by feeding, with higher quantity of muscle (63.15%) and less fat (16.63%) in the leg and loin cuts of lambs fed without sunflower seeds. In the leg was observed higher proportions of muscle (67.27%), muscle:bone ratio (4.08) and muscle:fat ratio (4.92) when compared with the loin cut. The water retention capacity and shearing force of Longissimus lumborum muscle showed better results when compared with Semimembranosus muscle. The inclusion of sunflower seeds in the diet of feedlot lambs increased the fat deposition in carcass cuts, however did not affect the other parameters of meat quality.

Características agronômicas e bromatolôgicas do milho submetido a adubações com potássio na produção de silagem

The aim was to evaluate levels and forms of application of potassium on the agronomic and alimentary characteristics of corn used for silage. The experiment was carried out at UNIFENAS during the agricultural year of 2008/2009. Fertilization at planting and sowing was performed manually using 120kg ha-1 P2O5 and 30kg ha-1 N, the potassium being applied according to the treatments. The experimental design used was of randomized blocks in a 4 x 2 factorial arrangement with four replications, using four amounts (0; 60; 90 and 120 kg ha-1) and two formsof application of K (100% at planting and 50% at sowing+50% coverage). The interaction between the factors of amount and forms of application of the potassium was not significant (p>0.05) for the variables studied: the main effect of each factor was then investigated. There was no effect (p>0.05) for K levels on the percentage of drymatter (DM) and bedded plants, DM and grain productivity and grain participation in the mass. The highest grain yield was obtained when using K at planting (p<0.05). High doses of potassium did not produce changes in DM, percentage of bedded plants, DM production, grain yield or grain percentage of the plant. The different levels and forms of application of potassium do not alter the alimentary characteristics of corn silage.

Efeito de dois sistemas de manejo do solo nas propriedades físicohídricas, desenvolvimento radicular e produtividade do milho irrigado

Corn cultivation is part of crop rotation used by irrigation farmers from the southwestern region of São Paulo state, Brazil, who use no-tillage soil management as a kind of sustainable use of soil. The effect of this conservative practice on physical and hydrical properties of the soil, root development and corn crop yield compared to the conventional management was the objective of this work. The experiment was held at the Buriti-Mirim Farm, Angatuba, SP, Brazil, using an irrigated area with a center pivot system and two types of soil management: conventional and no-tillage systems. Although the no-tillage management had higher soil density and less water availability, no significant difference was found for both management systems concerning soil resistance to penetration, root development and crop yield. In both systems of soil management, 90% of roots were concentrated in the first 0-20cm of soil layer.

Densidades e arranjos populacionais de milho e componentes agronômicos

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Adubação nitrogenada e inoculação com rizóbio no feijoeiro em sucessão ao milho consorciado com braquiárias no sistema plantio direto

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Resposta do milho à adição de níveis de fitomassa de Brachiaria decumbens Stapf e nitrogênio em latossolo vermelho

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Sistemas de preparo do solo e populações de plantas em espaçamento reduzido: comportamento de cultivares de milho (Zea mays L.)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Gesso de minério associado a fontes de fósforo na cultura do milho em sistema plantio direto no Estado de Alagoas

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Comportamento de milho (Zea Mays L.) e propriedades físicas do solo, no sistema plantio direto, em resposta a aplicação de fertilizante organomineral

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Determinação dos períodos críticos de interferência das plantas daninhas sobre o milho (Zea mays L. cv C333) em função da redução de espaçamento da cultura

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Milho e Brachiaria decumbens em sistemas de integração lavoura-pecuária

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Manejo do nitrogênio em cobertura na cultura do milho (Zea mays L.) em solo arenoso baseado no índice relativo de clorofila

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Épocas de adubação nitrogenada na cultura do milho e sua influência na cultura subsequente, girassol, em sistema de semeadura direta

Pós-graduação em Agronomia (Agricultura) - FCA

Períodos de interferência de uma comunidade infestante na cultura do milho em primeira e segunda safras

Pós-graduação em Agronomia (Agricultura) - FCA

Teste de submersão em água para avaliação do vigor de sementes de milho

Pós-graduação em Agronomia (Agricultura) - FCA