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Four experiments were conducted to investigate the effects of feeding frequency on growth of juvenile Atlantic halibut, Hippoglossus hippoglossus L. Fish (22–75 g) fed three (3 ×) or five times per day (5 × day?1) under constant light and temperature (13±1°C) consumed significantly more feed than fish fed 1 × day?1 but by the end of the experiment only fish fed 5 × day?1 were heavier and had greater specific growth rates (SGR). Under simulated winter conditions (9L:15D, 5±1°C), halibut (～300 g) fed every other day consumed more feed, had a greater SGR and final weight compared with fish fed every third day. Feed conversion ratios were not different among treatment groups in any of the experiments. These results suggest that growth rates may be improved by feeding juvenile halibut more than 1 × day?1. 相似文献
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Gwynne DT 《Science (New York, N.Y.)》1981,213(4509):779-780
Male Mormon crickets produce a large spermatophore that the female eats. Spermatophore proteins are important to female reproduction, and females compete for access to singing males. Males reject most receptive females as mates, and those accepted are more fecund than rejected individuals. This role reversal in courtship is in contrast to the behavior of the sexes in katydid species in which the males produce small spermatophores. 相似文献
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Concurrent Cryptosporidium and parvovirus infections in a puppy 总被引：2，自引：0，他引：2
Cryptosporidium parvum, an intestinal coccidian parasite, was isolated from faeces and intestinal biopsies of a 9-week-old puppy with acute parvoviral gastroenteritis. Gene sequence analysis identified a Cryptosporidium genotype not previously recorded in Australia. The puppy recovered after treatment with crystalloid fluids, synthetic and natural colloids and jejunostomy tube feeding. 相似文献
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Two levels of nitrogen application (70 and 180 lb per acre per annum) were compared on 6 long-duration leys. The treatments were repeated for periods of up to 4 years on tiie same swards. The higher N dressing produced 2230 lb more dry matter per acre than the low rate, an increase of 28%, and the yield was also more evenly spread throughout the season. There was virtually no clover on the high-N swards. The proportion of clover varied under low N but tended to increase as the season progressed. The sown grasses remained the dominant sward constituents throughout the experiment, and there was no sign of loss of vigour on the high-N swards. Utilized-starch-equivalent outputs were calculated from 3 different swards for 1956–8 and there was a significant positive correlation between the dry-matter yields and utilized-starch-equivalent output of swards. 相似文献
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TURNIP YELLOW MOSAIC IN BROCCOLI 总被引：2，自引：2，他引：0
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Gwynne CS 《Science (New York, N.Y.)》1938,88(2289):452-453
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Robert N. Gwynne 《Asia Pacific viewpoint》2006,47(3):381-395
Abstract: This paper explores the theme of governance as it relates to the evolution of global commodity chains in agro‐industry and their incorporation of wine firms in two countries of the semi‐periphery, New Zealand and Chile. The paper goes on to specifically examine the upstream and downstream relationships of selected New Zealand and Chilean wine firms to the wider commodity chains in which they are involved. Brief case studies will analyse the downstream and upstream links to the commodity chain of key wine firms in both countries. Such cases provide indicative evidence of the underlying processes of the commodity chain that are constantly changing. 相似文献
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