Mechanisms underlying Phalaris aquatica "sudden death" syndrome in sheep     

CA BOURKE  MJ CARRIGAN 《Australian veterinary journal》1992,69(7):165-167

Twenty outbreaks of Phalaris aquatica "sudden death" syndrome in sheep were investigated between 1981 and 1991. Four were confirmed and one was suspected, to be a cardiac disorder; 5 were confirmed and 3 were suspected, to be a polioencephalomalacic disorder; the aetiology of the remaining 7 outbreaks could not be determined. Potentially toxic levels of hydrocyanic acid (20 to 36 mg/100 g) were measured in the 3 toxic phalaris pastures tested. The measurement of potentially toxic levels of nitrate nitrogen (2920 micrograms/g) in toxic phalaris pastures by others, was noted. It is suggested that phalaris "sudden death" syndrome could have as many as 4 different underlying mechanisms, and that these might reflect the presence in the plant of a cardio-respiratory toxin, a thiaminase and amine co-substate, cyanogenic compounds, and nitrate compounds.  相似文献   

Quantification of Sexual Steroid Hormones in Faeces of Iberian Wolf (Canis lupus signatus): A Non‐invasive Sex Typing Method     

I Barja  G Silván  S Rosellini  A Piñeiro  MJ Illera  JC Illera 《Reproduction in domestic animals》2008,43(6):701-707

The determination of gender in wild animals is essential for behavioural and ecological studies, and also for conservation. The objectives of this study were (i) the determination of gender in faecal samples of Iberian wolf based on the differential concentrations of sexual steroid hormones (SSH) and (ii) to analyse the profiles of SSH in males and females (considering the gender determination carried out previously) during the non‐reproductive and reproductive periods. The quantification of androgens (testosterone, T), progestin (progesterone, P) and oestrogen (oestradiol, E) was conducted by means of enzyme immunoassay. The k‐means conglomerate analysis showed that the 59 faecal samples grouped into three different conglomerates, considering SSH levels. Groups 1 and 2 showed higher levels of T than group 3. Therefore, the faecal samples included in groups 1 and 2 (17 samples) corresponded to males and those of group 3 (42 samples) to females. The levels of T + P + E and T/P were higher in the group of males than in the group of females. The results of this study also showed that levels of T in males were higher during the reproductive period than in the non‐reproductive period. However, the concentrations of P and E turned out to be higher during the non‐reproductive season. In females, the levels of the three hormones (T, P and E) were higher during the reproductive period.  相似文献   

Hyperthermia and death in feedlot cattle associated with the ingestion of Claviceps purpurea     

RL PEET  MR McCARTHY  MJ BARBETTI 《Australian veterinary journal》1991,68(3):121-121

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The molecular epidemiology of equine herpesvirus 1 (equine abortion virus) in Australasia 1975 to 1989     

MJ STUDDERT  BS CRABB  N FICORILLI 《Australian veterinary journal》1992,69(5):104-111

The restriction endonuclease DNA fingerprints of 57 isolates of equine herpesvirus 1 (EHV1; equine abortion virus) from abortion, perinatal foal mortalities and encephalitis from 15 epidemics that occurred in Australasia between 1975 and 1989 were examined using the enzymes Bam HI, EcoRI and Bgl II. There was a remarkable degree of uniformity in the restriction patterns; mobility differences were observed in only 14 of 52 (27%) of the fragments. Twelve of these 14 fragments were located within the repeat structures that bracket the unique short region of the genome or were located at the left terminus of the 150 kilobase pair genome. Based on the Bam HI fingerprints the commonest virus identified in our study was EHV1.IP (P is for prototype strain). There was a single notable exception in that the Bam HI fingerprints of all 8 isolates from one of 3 Victorian farms that experienced abortion in 1989 resembled a variant EHV1.IB that was identified as a cause of abortion in Central Kentucky in 1970 to 1974. We present evidence that EHV1.IB caused abortion in California in 1964 and has remained unaltered in its Bam HI restriction pattern. No antigenic differences were found among 4 distantly related EHV1 isolates, including the variant IB, using a panel of 5 monoclonal antibodies to glycoprotein C (gC), a glycoprotein recognised to be highly variable. The uniformity of these unrelated EHV1 isolates is further evidence for a recent origin for EHV1 and may help to explain the natural history of this virus in the horse in which it seems to be a cause of serious epidemics of abortion and perinatal mortality, and less commonly of encephalitis.  相似文献   

Bluetongue in Australia—an entomologist''s view   总被引：1，自引：0，他引：1  

HA STANDFAST  MJ MULLER 《Australian veterinary journal》1989,66(12):396-397

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Rhodococcus equi infection in goats   总被引：1，自引：0，他引：1  

MJ CARRIGAN  IJ LINKS  AG MORTON 《Australian veterinary journal》1988,65(10):331-332

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Further analysis of bile crystals from sheep grazing Panicum schinzii (sweet grass)     

CO MILES  SC MUNDAY  PT HOLLAND  MJ LANCASTER  AL WILKINS 《Australian veterinary journal》1992,69(2):34-34

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Evaluation of the culture of honey to detect American foul brood     

MJ KABAY 《Australian veterinary journal》1995,72(1):33-34

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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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Prevalence of resistance in sheep nematode populations to benzimidazole and levamisole anthelmintics in the high rainfall areas of South Australia     

I. BEVERIDGE  NJS ELLIS  MJ RILEY  TH BROWN 《Australian veterinary journal》1990,67(11):413-415

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