Estradiol and progesterone concentrations resulting from the administration of an exogenous hormone regimen in diestrous embryo transfer recipients     

K. Pool-Anderson MS  J.M. Wilson PhD  G.W. Webb PhD  D.C. Kraemer PhD  DVM  G.D. Potter PhD  J.W. Evans PhD 《Journal of Equine Veterinary Science》1988,8(2)

Estradiol and progesterone concentrations were evaluated from diestrous embryo transfer recipient mares (5 to 14 days post-ovulation) which were treated with an exogenous hormone regimen. Upon detection of the donor mare's ovulation (0 hours), 10 mg PGF_2α was given to the recipient mare; at 12, 24 and 36 hours 20 mg estradiol cypionate; at 48 hours, 500 mg progesterone in oil and then 22 mg altrenogest at 60, 72 and 96 hours. Altrenogest (22 mg/day) was continued until end of the trial (detection of a fetal heart beat). Embryos were transferred non-surgically 6 or 7 days after the start of treatment.Plasma samples were evaluated over three periods; period 1-between recipient mare ovulation and prior to PGF_2α period 2-between PGF and embryo transfer and period 3-post-transfer. During periods 2 and 3, estradiol was higher (P<.05) for mares which were 10 to 14 days post-ovulation (late diestrous) as compared to mares which were 5 to 9 days post ovulation (mid-diestrous) when treatment began. Progesterone concentrations were higher (P<.05) for the mid-diestrous mares in the same periods. The pregnancy rate was higher for the late diestrous mares than the mid-diestrous mares (58% (7/12) vs 10% (1/10)). However, no difference (P>.05) was detected in estradiol or progesterone in the late diestrous mares which were pregnant or open. During period 2, estradiol was higher (P<.05) in the pregnant than open mares. Whereas, during period 3, progesterone was higher (P<.05) in the open mares.These data suggest that estradiol is important for the establishment of pregnancy in the mare. Furthermore, hormone treatment developed in this study appears to have some potential in synchronization of diestrus mares to be used as embryo recipients.  相似文献   

Eimeria leuckarti infections in three foals     

GP REPPAS  GH COLLINS† 《Australian veterinary journal》1995,72(2):63-64

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An outbreak of bovine ephemeral fever in northeast Victoria     

MJ SHIEL  J. CAMPBELL  KE DAVIS  GP DAVIS 《Australian veterinary journal》1989,66(7):222-223

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Bluetongue research in Australia—1993     

GI ALEXANDER  TD ST  GEORGE GP GARD 《Australian veterinary journal》1994,71(6):182-183

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Exploring Northeast American and Asian species of Porphyra for use in an integrated finfish-algal aquaculture system     

R. Carmona  G.P. Kraemer 《Aquaculture (Amsterdam, Netherlands)》2006,252(1):54-65

Many aquaculture industries generate a nutrient-rich waste stream that can lead to eutrophication of coastal waters. To address this environmental issue, the bioremediation potential of several native Northeast American species of Porphyra was assessed and compared to the well-known Asian species. Porphyra thalli were cultured over 4 weeks at 15 °C at a stocking density of 0.4 g FW L^− 1. At 3- to 4-day intervals nutrient uptake, tissue N accumulation and phycobiliprotein concentration (PBP) were determined as functions of nitrogen (N) concentration (25-300 μM) and N source (nitrate vs. ammonium). Growth rates were measured weekly. Growth and tissue N reached maximal levels at inorganic N concentrations of 150-300 μM. Maximum growth rates ranged from 10% to 25% day^− 1, although induction of archeospores reduced average growth rates in many cases. No evidence of ammonium toxicity (reductions in growth rate) was observed; in fact, similar values were found with both N sources. Ammonium generally yielded higher PBP and tissue N contents than nitrate. Porphyra amplissima presented the highest growth rate, followed by the Asian Porphyra yezoensis. Under the experimental conditions, Porphyra spp. removed 70-100% of N within 3-4 days at N concentrations up to 150 μM, but was less efficient in removing inorganic phosphorus (35-91% removal). The highest tissue N and PBP concentrations were found at 150-300 μM of N, with N values close to 7% DW. Overall, Porphyra appears to be an excellent choice for bioremediation of moderately eutrophic effluents, with the added benefit that tissue may be harvested for sale.  相似文献