Comparison of the efficacy of macrocyclic lactone anthelmintics,either singly or in combination with other anthelmintic(s), in nine beef herds in southern NSW     

MB Allworth  B Goonan  JE Nelson  G Kelly  SR McGrath  RG Woodgate 《Australian veterinary journal》2023,101(8):293-295

Anthelmintic resistance (AR) is a well-recognized challenge in farmed ruminants. The use of anthelmintics in combination is one of the strategies recommended to slow the rate of AR development. Two studies were undertaken in 2017 and 2019 to assess the efficacy of single-dose macrocyclic lactone (ML) anthelmintic and ML combination drenches. In total, 11 Faecal Egg Count Reduction Trials (FECRTs) were set up in 10 different beef herds, with results available from 10 of those FECRTs (9 herds). AR to a single ML anthelmintic was detected in all 9 herds, with resistance to Cooperia and Haemonchus spp on 9 farms, and resistance to Ostertagia and Trichostrongylus spp on 2 farms. In contrast, for the ML combination anthelmintics, all FECRTs resulted in efficacies of 99%–100%. The results suggest that cattle producers should strongly consider using combination drenches in their herds in preference to single actives.  相似文献   

Relationships among Puberty,Muscle and Fat,and Liveweight Gain during Mating in Young Female Sheep          下载免费PDF全文

CA Rosales Nieto  MB Ferguson  H Thompson  JR Briegel  CA Macleay  GB Martin  AN Thompson 《Reproduction in domestic animals》2015,50(4):637-642

Greater depths of muscle are associated with better reproductive performance in ewe lambs, but, in adult ewes, reproductive performance also seems to vary with liveweight gain during the mating period. Therefore, in a large field study with Merino ewe lambs, we tested whether the relationships among eye muscle depth (EMD), fat depth (FAT) and reproductive performance depend on liveweight gain during the mating period. We selected lambs with a wide range in phenotypic values for depths of eye muscle (EMD) and fat (FAT) and assigned them to dietary treatments designed to achieve low (LOW, n = 244) or high (HIGH, n = 237) rates of liveweight gain during a 28‐day mating period. The LOW treatment maintained live weight, whereas the HIGH treatment gained 179 ± 3.8 g/day (p < 0.001). From those ewe lambs that attained puberty, first oestrus was detected at live weight 37.8 ± 0.2 kg and age 232 days. The proportion of ewes that attained puberty increased with EMD (p < 0.01). Ewes from the HIGH treatment were more fertile (pregnant ewes per 100 ewes exposed to rams) and had a higher reproductive rate (foetuses in utero per 100 ewes exposed to rams; p < 0.001) than those from the LOW treatment. Fertility and reproductive rate were positively correlated with weight gain during mating as well as live weight at the start of mating, FAT and EMD (p < 0.05 to <0.001). We conclude that faster growth, due to either extra nutrition during mating or higher phenotypic potential for fat and muscle, will increase reproductive performance in ewe lambs mated at 8 months of age.  相似文献   

Radiographic Progression of Osteoarthritis of the Canine Stifle Joint: A Prospective Study     

J. F. Innes  BVSc  PhD    M. Costello  MVB    F. J. Barr  MA  Vet.  MB    H. Rudorf  Dr. Med. Vet.    A. R. S. Barr  MA  Vet.  MB  PhD 《Veterinary radiology & ultrasound》2004,45(2):143-148

A radiographic scoring system for features of osteoarthritis of the canine stifle joint was devised. Intra- and inter-rater agreement was assessed by calculation of unweighted kappa statistics. "Global score," "effusion," "osteophytosis," and "intra-articular mineralization" were all features that had acceptable reliability, but "subchondral sclerosis" did not. The scoring system was used in a 13-month prospective study of the radiographic progression of osteoarthritis of the stifle joint, secondary to cranial cruciate ligament deficiency, in 58 dogs. In the index stifle joints all features were characterized by significant change over time, but osteophytosis had the greatest degree of change. In addition, 40% of contralateral joints showed progressive osteophytosis.  相似文献   

IDENTIFICATION OF ARACHNOID CYSTS IN THE QUADRIGEMINAL CISTERN USING ULTRASONOGRAPHY     

Miyoko  Saito  DVM  Natasha J.  Olby  VET MB  PhD  Kathy  Spaulding  DVM 《Veterinary radiology & ultrasound》2001,42(5):435-439

The ultrasonographic findings in three small breed dogs with intracranial arachnoid cysts are described. Ultrasound images were obtained via the foramen magnum, temporal window and persistent bregmatic fontanelle (when possible). In transverse, dorsal and sagittal transcranial ultrasound images there was marked dilation of the lateral ventricles and a well-defined, oval to triangular-shaped anechoic area between the caudal aspect of the occipital lobes, dorsal to the midbrain, and rostral to the cerebellum. These findings were consistent with a diagnosis of concurrent hydrocephalus and an arachnoid cyst within the quadrigeminal cistern.  相似文献   

Endogenous Benzodiazepine Activity in the Peripheral and Portal Blood of Dogs With Congenital Portosystemic Shunts     

LILLIAN R. ARONSON VMD    REYNALDO C. GACAD MD    KRISTINE KAMINSKY-RUSS MS    CLARE R. GREGORY DVM  Dipiomate ACVS  KEVIN D. MULLEN MB  FRCPI 《Veterinary surgery : VS》1997,26(3):189-194

Objective- The purpose of this study was to determine whether an endogenous benzodiazepine receptor ligand (EBZ) was present in the arterial and portal blood of dogs with congenital portosystemic shunts (CPSS).
Study Design- The presence or absence of an EBZ was determined by the collection of systemic and portal blood from dogs with CPSS.
Animals- Fifteen client-owned dogs with a confirmed CPSS. All dogs had historical signs compatible with hepatic encephalopathy. Eight healthy dogs were used as controls.
Methods- In all dogs, systemic blood samples were collected after they were anesthetized. Portal blood samples were collected intraoperatively. EBZ was measured by radioreceptor assay.
Results- In 10 of 15 dogs, the portal blood concentration of EBZ was significantly elevated compared with normal dogs (mean, 13.2 ±18.55 ng/mL). Five dogs had elevated systemic blood EBZ levels (mean, 8.2 ±16.08 ng/mL). Eleven of 15 dogs had a higher portal than systemic blood concentration of EBZ. In contrast, control dogs had extremely low EBZ concentrations detected in their portal blood (mean, 0.16 ±0.3 ng/mL) and systemic blood (0 ng/mL). The mean portal and systemic blood concentrations in dogs with CPSS were significantly greater than in control dogs ( P <.05).
Conclusions- Elevated blood levels of EBZ were found in dogs with CPSS. The portosystemic gradient noted in 11 dogs suggests the gastrointestinal tract as a possible source for the endogenous ligand.
Clinical Relevance- Generalized motor seizures have been reported in dogs after surgical correction of CPSS. If the presence of a CPSS results in stimulation of brain receptors for benzodiazepines, post-CPSS ligation seizures may result from a withdrawal of EBZ after ligation of the portosystemic shunt.  相似文献   

TRUE DIAPHRAGMATIC HERNIA IN A CAT     

Andra K.  Voges  DVM  Scott  Bertrand  DVM  Richard C.  Hill  MA Vet MB  PhD  Lisa  Neuwirth  DVM  MS  Michael  Schaer  DVM 《Veterinary radiology & ultrasound》1997,38(2):116-119

A report of a cat with a true diaphragmatic hernia in which only falciform fat had herniated is pressented. The lession was misinterpreted as a pulmonary mass. Additional radiographic studies which may have been of diagnostic benefit are briefly discussed.  相似文献   

Normal and abnormal sex, chromosomes and H-Y antigen     

C.R.E. Hainan MA VET. MB  PhD  FRCVS 《Journal of Equine Veterinary Science》1985,5(1):38-39

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Modelling the potential impact of exotic diseases on regional Australia     

MG GARNER  MB LACK 《Australian veterinary journal》1995,72(3):81-87

SUMMARY: Recent international initiatives for disease control suggest that, in the future, the consequences for trade of an exotic disease outbreak may not be as severe as estimated in the past. If zoning were to be accepted by Australia's trading partners, then the major effects may be felt at the regional rather than the national level. A study, using an integrated epidemiological/economic model, was undertaken to compare the impacts of 3 important exotic diseases (foot-and-mouth disease, classical swine fever and sheep pox) in 3 different regions of Australia. The study demonstrated that there are significant differences between the size and effect of different disease outbreaks. Regional factors influence not only the way that the disease will spread and manifest itself, but also the effects on local communities. Foot-and-mouth disease caused more economic losses than sheep pox or classical swine fever. The major determinant of differences in the effects of the diseases between regions was the nature of the regional economies. The less diversified the economy, the greater the effect of an exotic disease outbreak in relation to the size of that economy.  相似文献   

Cryptococcal meningitis in an alpaca   总被引：1，自引：0，他引：1  

LM GOODCHILD  AJ DART  MB COLLINS  CM DART  JL HODGSON  DR HODGSON 《Australian veterinary journal》1996,74(6):428-430

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Stem Cell–based Therapies for Bone Repair     

Peter I. Milner BVetMed  PhD  CertES  MRCVS  Peter D. Clegg MA  Vet MB  PhD  Matthew C. Stewart BVSc  MVetClinStud  PhD 《Veterinary Clinics of North America: Equine Practice》2011,27(2):299-314

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