The effect of copper and fat addition to the diets of weanling swine on growth performance and serum fatty acids.   总被引：7，自引：0，他引：7  

C R Dove  K D Haydon 《Journal of animal science》1992,70(3):805-810

A 2 x 3 factorial experiment, encompassing three 28-d trials involving a total of 420 weanling pigs, was conducted to determine the effect of dietary Cu (5 or 250 ppm) and animal fat (0, 2.5, or 5%) on the performance and serum fatty acid profiles of weanling pigs. Pigs had ad libitum access to corn-soybean meal-based diets containing 10% whey and 5% fish meal and similar lysine:calorie ratios. Pigs were weighed and pen feed intakes were recorded weekly. Weekly blood samples were collected during the first two trials (n = 270) for serum fatty acid analysis. There was a Cu x fat interaction for ADG from d 1 to 14 (P less than .07) and over the 28-d experiment (P less than .05). The ADG of pigs fed 250 ppm of Cu increased, whereas the ADG of pigs fed 5 ppm of Cu was not affected as dietary fat increased. The addition of 250 ppm of CU increased (P less than .01) ADFI throughout the 28-d experiment. The addition of fat quadratically increased ADG (P less than .05) during d 14 to 28 and gain:feed ratios (P less than .01) during d 14 to 28 and over the 28-d experiment. The addition of fat decreased (P less than .05) the weight percentage of serum saturated fatty acids and increased (P less than .01) the weight percentage of serum monounsaturated fatty acids on d 28. The addition of 250 ppm of Cu decreased (P less than .01) the weight percentage of monounsaturated fatty acids on d 14 and 28.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Effect of the non-steroidal anti-inflammatory drug, carprofen, on weaned sheep following non-surgical mulesing by intradermal injection of cetrimide     

IG Colditz  JB Lloyd  DR Paull  C Lee  A Giraudo  C Pizzato  AD Fisher 《Australian veterinary journal》2009,87(1-2):19-26

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Risk characterisation and management of sewage sludge on agricultural land-implications for the environment and the food-chain     

AD ROSS  RA LAWRIE†  JP KENEALLY  MS WHATMUFF† 《Australian veterinary journal》1992,69(8):177-181

The disposal of sewage wastes may cause severe environmental problems as was graphically demonstrated with pollution on Sydney's ocean beaches in recent years. Sewage sludges contain valuable plant nutrients and organic matter which can improve the fertility and structure of the soil. However, human parasites, pathogenic micro-organisms and chemicals capable of causing soil contamination, phytotoxicity and residues in animal products may also be present. Although sewage sludge is frequently spread on agricultural land overseas, it is not common in Australia and most states do not have specific regulations to minimise risk and promote good practice. A sludge-to-land program began in the Sydney region in 1990. It follows guidelines written by NSW Agriculture to encourage beneficial agricultural use of sludge by adoption of environmentally sustainable practices. This article describes the major risks to the food-chain and the environment, which may be associated with applying sewage sludge to agricultural land. It summarises how the risks are managed, and where further research data are required.  相似文献   

Effect of trace minerals on the stability of vitamin E in swine grower diets   总被引：5，自引：0，他引：5  

C R Dove  R C Ewan 《Journal of animal science》1991,69(5):1994-2000

The stability of alpha-tocopheryl acetate and inherent tocopherols in swine grower diets containing high levels of trace minerals was studied in a 12-wk experiment. Corn-soybean meal diets with either 0 or 1% crude soybean oil and without trace minerals added (NOTM) were supplemented with a standard trace mineral mix (TM), TM + 250 ppm of Cu, TM + 1,000 ppm of Fe, TM + 1,000 ppm of Zn, or TM + 100 ppm of Mn. Alpha-tocopheryl acetate decreased linearly (P less than .0001) during 12 wk of storage in diets containing NOTM, TM, Zn, or Mn at a rate of .015 mg/d. Addition of Fe (P less than .005) or Cu (P less than .05) increased the rate of alpha-tocopheryl acetate loss. The addition of soybean oil had no effect (P greater than .1) on the rate of alpha-tocopheryl acetate loss. The alpha-tocopherol levels of the NOTM diet decreased (P less than .01) by approximately 50% during the 12-wk storage period. Addition of TM alone in diets that did not contain soybean oil had no effect P greater than .1) on the rate of alpha-tocopherol loss. The addition of Cu, Fe, Zn, or Mn (P less than .05) to diets that did not contain soybean oil increased the rate of alpha-tocopherol loss in comparison with NOTM and TM diets. Addition of Cu decreased alpha-tocopherol below 10% of initial levels in approximately 10 d. The addition of soybean oil to the diets containing TM, Fe, Zn (P less than .005), or Mn (P less than .05) further increased the rate of alpha-tocopherol loss.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Editorial     

Hugh Dove  Alan Hopkins 《Grass and Forage Science》2012,67(4):461-461

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Are strain genetic effect and heterosis expression altered with culture system and rearing environment in the Portuguese oyster (Crassostrea angulata)?          下载免费PDF全文

Vu Van In  Vu Van Sang  Wayne O'Connor  Phan Thi Van  Michael Dove  Wayne Knibb  Nguyen Hong Nguyen 《Aquaculture Research》2017,48(8):4058-4069

Re‐ranking of strain additive genetic effect and heterosis expression in different culture environments is not well understood in shellfish species. This study was carried out to estimate the strain additive genetic and heterotic effects on harvest body weight in a 3 × 3 complete diallel cross involving three populations of Portuguese oyster (Crassostrea angulata), two populations from Cat Ba (RIA1) and Nam Dinh, northern Vietnam, and an imported stock from China. Strip spawning was applied to produce full‐ and half‐sib families simultaneously of nine cross‐combinations for performance testing at two locations (Cat Ba Island, Hai Phong city and Van Don Island, Quang Ninh province, Vietnam) using two culture systems (‘single seed’ and ‘cultch set’). A total of 7269 individual oysters were examined over a grow‐out period of 270 days. A linear mixed model was used to estimate strain additive genetic and heterotic effects for body weight at harvest. Ranking of strains based on their additive genetic effects did not differ between the locations and culture systems. The non‐additive genetic (heterotic) effects were low and not significantly different from zero for the traits studied among culture systems. There were no significant differences in levels of heterosis for harvest body weight between the two test environments or culture systems. Based on the non‐significant heterotic and large additive genetic effects among strains used for this study, a future breeding programme in this species (C. angulata), setting aside issues of diversity, could be based simply on choice among different strains based on their performance.  相似文献   

Feed supplementation blocks. Urea‐molasses multi‐nutrient blocks: simple and effective feed supplement technology for ruminant agriculture     

Hugh Dove 《Grass and Forage Science》2009,64(1):106-106

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Epidemic of blindness in kangaroos - evidence of a viral aetiology     

PT HOOPER  RA LUNT  AR GOULD  AD HYATT  GM RUSSELL  JA KATTENBELT  SD BLACKSELL  LA REDDACLIFF  PD KIRKLAND  RJ DAVIS  PJK DURHAM  AL BISHOP  J WADDINGTON 《Australian veterinary journal》1999,77(8):529-536

OBJECTIVE: To determine the cause of an epidemic of blindness in kangaroos. DESIGN AND PROCEDURES: Laboratory examinations were made of eyes and brains of a large number of kangaroos using serological, virological, histopathological, electron microscopical, immunohistochemical methods, and PCR with cDNA sequencing. In addition, potential insect viral vectors identified during the disease outbreak were examined for specific viral genomic sequences. SAMPLE POPULATION: For histopathological analysis, 55 apparently blind and 18 apparently normal wild kangaroos and wallabies were obtained from New South Wales, Victoria, South Australia, and Western Australia. A total of 437 wild kangaroos and wallabies (including 23 animals with apparent blindness) were examined serologically. RESULTS: Orbiviruses of the Wallal and Warrego serogroups were isolated from kangaroos affected with blindness in a major epidemic in south-eastern Australia in 1994 and 1995 and extending to Western Australia in 1995/96. Histopathological examinations showed severe degeneration and inflammation in the eyes, and mild inflammation in the brains. In affected retinas, Wallal virus antigen was detected by immunohistochemical analysis and orbiviruses were seen in electron microscopy. There was serological variation in the newly isolated Wallal virus from archival Wallal virus that had been isolated in northern Australia. There were also variations of up to 20% in genotype sequence from the reference archival virus. Polymerase chain reactions showed that Wallal virus was present during the epidemic in three species of midges, Culicoides austropalpalis, C dycei and C marksi. Wallal virus nucleic acid was also detected by PCR in a paraffin-embedded retina taken from a blind kangaroo in 1975. CONCLUSION: Wallal virus and perhaps also Warrego virus are the cause of the outbreak of blindness in kangaroos. Other viruses may also be involved, but the evidence in this paper indicates a variant of Wallal virus, an orbivirus transmitted by midges, has the strongest aetiological association, and immunohistochemical analysis implicates it as the most damaging factor in the affected eyes.  相似文献   

Particle nucleation in the tropical boundary layer and its coupling to marine sulfur sources   总被引：1，自引：0，他引：1  

AD Clarke  D Davis  VN Kapustin  F Eisele  G Chen  I Paluch  D Lenschow  AR Bandy  D Thornton  K Moore  L Mauldin  D Tanner  M Litchy  MA Carroll  J Collins  G Albercook 《Science (New York, N.Y.)》1998,282(5386):89-92

New particle formation in a tropical marine boundary layer setting was characterized during NASA's Pacific Exploratory Mission-Tropics A program. It represents the clearest demonstration to date of aerosol nucleation and growth being linked to the natural marine sulfur cycle. This conclusion was based on real-time observations of dimethylsulfide, sulfur dioxide, sulfuric acid (gas), hydroxide, ozone, temperature, relative humidity, aerosol size and number distribution, and total aerosol surface area. Classic binary nucleation theory predicts no nucleation under the observed marine boundary layer conditions.  相似文献   

Evaluation on the use of e-learning tools to support teaching and learning in aquaculture and aquatic sciences education     

Sónia Seixas  Clive Dove  Bernd Ueberschär  John Bostock 《Aquaculture International》2015,23(3):825-841

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