12,366 research outputs found

    Fatty Acid Composition and Eating Quality of Muscle from Steers Offered Grazed Grass, Grass Silage or Concentrate-Based Diets

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    The effects of grazed grass, grass silage or concentrates on the eating quality and fatty acid composition of intra-muscular fat of steers fed to achieve similar carcass growth rates were investigated. Fifty steers were assigned to one of five dietary treatments. The experimental rations offered daily for 85 days pre-slaughter were (a) grass silage plus 4 kg concentrate, (b) 8 kg concentrate plus 1 kg hay, (c) 6 kg grazed grass dry matter (DM) plus 5 kg concentrate, (d) 12 kg grazed grass DM plus 2.5 kg concentrate or (e) 22 kg grazed grass DM. Decreasing the proportion of concentrate in the diet, which effectively increased grass intake, caused a linear decrease in the concentration of intra-muscular saturated fatty acids (SFA) (P \u3c .01) and in the n-6 to n-3 poly-unsaturated fatty acids (PUFA )ratio (P\u3c .001) and a linear increase in the PUFA to SFA ratio (P \u3c .01) and the conjugated linoleic acid concentration (P \u3c .001). There was an interaction (p\u3c 0.05) between ageing time and treatment with treatment d having higher (p\u3c 0.05) tenderness, texture and acceptability values after 2 days ageing, but not after 7 or 14 days ageing. The data indicate that intramuscular fatty acid composition of beef can be improved from a human health perspective by inclusion of grass in the diet without any negative effect on the eating quality

    Some Remarks about Variable Mass Systems

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    We comment about the general argument given to obtain the rocket equation as it is exposed in standard textbooks. In our opinion, it can induce students to a wrong answer when solving variable mass problems.Comment: 2 page

    Shell model study of the pairing correlations

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    A systematic study of the pairing correlations as a function of temperature and angular momentum has been performed in the sd-shell region using the spherical shell model approach. The pairing correlations have been derived for even-even, even-odd and odd-odd systems near N=Z and also for the asymmetric case of N=Z+4. The results indicate that the pairing content and the behavior of pair correlations is similar in even-even and odd-mass nuclei. For odd-odd N=Z system, angular momentum I=0 state is an isospin, t=1 neutron-proton paired configuration. Further, these t=1 correlations are shown to be dramatically reduced for the asymmetric case of N=Z+4. The shell model results obtained are qualitatively explained within a simplified degenerate model

    Remote sensing of vigor loss in conifers due to dwarf mistletoe

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    The initial operation of a multiband/multidate tower-tramway test site in northeastern Minnesota for the development of specifications for subsequent multiband aerial photography of more extensive study areas was completed. Multiband/multidate configurations suggested by the tower-tramway studies were and will be flown with local equipment over the Togo test site. This site was photographed by the NASA RB57F aircraft in August and September 1971. It appears that, of all the film/filter combinations attempted to date (including optical recombining of several spectral band images via photo enhancement techniques), Ektachrome infrared film with a Wratten 12 filter is the best for detecting dwarf mistletoe, and other tree diseases as well. Using this film/filter combination, infection centers are easily detectable even on the smallest photo scale (1:100,000) obtained on the Togo site

    Editorial

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    Editorial: Congress and a Budget

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    Editorial

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