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JT SEAMAN WS TURVEY SJ OTTAWAY AR GILMOUR RJ DIXON† 《Australian veterinary journal》1989,66(9):279-285
A field grazing trial was undertaken to monitor the health and production of crossbred sheep grazing pasture where Echium plantagineum constituted a considerable proportion of the available forage. The trial, conducted for 19 months over successive grazing seasons, demonstrated a significant difference in production, with sheep on the E. plantagineum pasture being lighter and growing less wool compared with sheep on Echium-free pasture. No mortalities involving pyrrolizidine alkaloid poisoning were recorded in sheep grazing E. plantagineum, although there was histological evidence of moderately severe liver damage associated with high liver copper concentrations in at least one sheep following the grazing of large quantities of the plant. 相似文献
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G. A. Watson† 《The Journal of Horticultural Science and Biotechnology》2013,88(2):136-145
SummaryThe productivity of ornamental foliage plants is related to their capacity to increase their leaf number and leaf size. In Monstera deliciosa, a change in leaf shape is also a pre-requisite for successful marketing. The aim of this work was to describe the effects of different concentrations of exogenous 6-benzylaminopurine (BAP; 5, 50, 100, or 200 mg l–1) on the control of both leaf size and leaf shape in M. deliciosa, and the impact of these changes on commercial plant productivity. We found an increase of between 15.4 – 23.1% in the rate of leaf appearance (RLA), which reflected a shortening of the phyllochron, and an increase of between 17.5 – 34.9% in the relative rate of leaf area expansion (RLAE) at most of the BAP concentrations tested. This resulted in higher biomass accumulation in both roots and shoots through an increase of between 5.4 – 7.9% in the relative growth rate (RGR), mainly associated with higher net assimilation rates (NAR; increases from 9.0-fold to 11.0-fold) and increased photoassimilate partitioning to the shoots. The most important result of this work was the early appearance of perforated leaf laminae in M. deliciosa plants sprayed with 50 – 200 mg l–1 BAP, which made them ready for sale. 相似文献
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Synchronization of the donor cell cycle is an important factor for successful animal cloning by nuclear transfer. To improve the efficiency of porcine cloning, in the present report, we evaluated effects of contact inhibition, serum starvation and roscovitine treatment of donor cells on in vitro and in vivo developmental potency of cloned porcine embryos. Fibroblasts derived from a porcine foetus at day 30 of gestation were isolated and cultured to 70% confluency. Then, cells were either cultured to 100% confluency for contact inhibition, or cultured in 0.5% serum for 72 h for serum starvation or with 15 μm roscovitine for 24 h. Cells were most effectively synchronized at G0/G1 in the serum starvation group (87.5%) compared with the contact inhibition and roscovitine treatment groups (76.3% and 79.9% respectively p < 0.05). However, after somatic cell nuclear transfer followed by in vitro culture, the serum starvation group showed a significantly lower blastocyst formation rate (5.6%) compared with the contact inhibition and roscovitine treatment groups (11.6% and 20.0% respectively). Differential expression of apoptosis‐related genes and the level of apoptosis in each treatment group explain the variation in developmental competence among the groups. Significantly higher level of apoptosis was observed in the serum starvation group. On the other hand, the roscovitine treatment group shows the lowest level of apoptosis and the best in vitro development among the groups. Cloned embryos derived from roscovitine‐treated donor cells were transferred to surrogate pigs. Three healthy live piglets were produced. In conclusion, we suggest that roscovitine treatment of donor cells improves development of cloned porcine embryos and can raise the efficiency of cloned piglet production. 相似文献
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JT ROTHWELL KC HACKET I RIDLEY L MITCHELL C DONALDSON LB LOWE 《Australian veterinary journal》1999,77(4):255-258
OBJECTIVE: To assess the efficacy of zeta-cypermethrin pour-on to control cattle lice. DESIGN: Five field trials in south-eastern Australia. PROCEDURE: Zeta-cypermethrin pour-on, deltamethrin pour-on and pour-on vehicle were applied to groups of 10 cattle. Lice were counted before treatment and 14, 28, 42 and 56 days after treatment. RESULTS: Zeta-cypermethrin pour-on given at 2.5 mg/kg was equivalent to, or marginally more effective than a deltamethrin pour-on at 0.75 mg/kg. It eliminated B bovis and H eurysternus and gave good control of L vituli and S capillatus. Zeta-cypermethrin at 1 mg/kg gave good control of B bovis and H eurysternus but was not satisfactory against L vituli and S capillatus. CONCLUSION: Zeta-cypermethrin pour-on, given at 2.5 mg/kg, is an effective treatment for cattle lice control. Zeta-cypermethrin, and other synthetic pyrethroid pour-ons, are the treatment of choice to control B bovis. 相似文献
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