In this issue – July 2009

Musculoskeletal disorders in Queensland veterinarians  ▪  Australian surveillance for avian influenza viruses in wild birds  ▪  Splenic lymphoma in an echidna  ▪  Post-thaw motility of equine semen  ▪  Serum cobalamin concentrations in cats  ▪  Acute toxicity of snail and slug bait in dogs  ▪  Topical hydrocortisone aceponate for flea-allergy dermatitis in dogs  ▪  Activated coagulation times in normal cats and dogs  ▪  Acquired arachnoid cyst in a cat     

SCIENTIFIC AND CLINICAL: In this issue – September 2010

Agricultural shows and communicable disease transmission in poultry · Capsule endoscopy in horse small intestine · Acute lameness from a bone metastasis in a horse · Tidal breathing flow volume loop in dogs with tracheal masses · Intracranial meningioma and facial myokymia in a dog · Caudal epidural flank anaesthesia using multiport catheters in cattle · Needle-free vaccination in sheep · Smoking vets in Australia     

用β-甘露聚糖酶改善单胃动物对大豆的利用

饲用酶对于养禽业和养猪业来说并非新事物 ,但因其能节约饲料成本并能减轻畜牧生产对环境的污染 ,人们对其的兴趣与日俱增。在以小麦为基础的日粮中添加木聚糖酶而在以大麦为基础的日粮中添加 β-葡聚糖酶 ,可改善日粮的消化率并降低肠道内容物的粘稠度。所以 ,在主要应用这些饲料的地方都广泛使用这些酶 ,比如在北欧以及在北美和大洋洲的某些地区。许多日粮中还应用植酸梅以便减少粪中的磷。不过 ,酶制剂在以玉米 -大豆为基础的单胃动物日粮中的应用还非常有限。最近对于能量利用、体重均一度以及与健康状态有关的参数所作的研究表明 ,用 …     

Restricted and Satiate Feeding of Two Genetically Isolated Strains of Juvenile Channel Catfish Ictalurus punctatus Reared on 28% and 32% Protein Diets

A 10-wk growth comparison trial of two strains of channel catfish Ictalurus punctatus was conducted in 40 120-L flow-through aquaria using a 2 ± 2 × 2 factorial experiment design. The three factors evaluated were: strain (Norris and NWAC103), dietary protein level (28% and 32%), and feeding rate (restricted and satiate). Average initial weight (× SD) for the Norris strain was 3.0 ± 0.08 g/fish, while that of the NWAC103 strain was 4.7 ± 0.13 g/fish. The feeding rate for the satiated group was adjusted based on feeding observations. The feeding rate for the restricted group was adjusted to about ²/₃ of the satiate level. For both satiate and restricted feeding regimens, the NWAC103 strain consumed more feed than the Norris strain. Fish of Norris strain fed the 32% protein diet consumed more feed than fish fed the 28% protein diet; however, there were no differences in feed consumption in the NWAC103 fish fed the two protein diets. Regardless of feeding rate, the NWAC103 fish gained more weight and converted feed more efficiently than the Norris fish. Fillet composition was not affected by fish strain. Fish fed the 28% protein diet had a lower level of fillet protein than fish fed the 32% protein diet. In fish fed to satiation, a 32% protein diet resulted in a lower fillet fat level than a 28% protein diet, but no differences were observed in fillet fat levels between fish fed the two dietary protein levels for the restricted group. Results from the present study demonstrate that under laboratory conditions, the NWAC103 strain of channel catfish is superior to Norris strain in feed consumption, growth rate, and feed efficiency. Our data also indicate that either a 28% or 32% protein diet can be fed to either strain of channel catfish whether they are fed to satiation or fed a restricted ration with no detrimental effects on growth.     

Attempts at Interspecific Hybridization Between Phaseolus vulgaris L. and P. acutifolius A. Gray-Using Embryo Rescue

In diploid rye, two genes were detected which cause hybrid necrosis by complementary action if both are present in dominant condition. Moreover, these genes cause hybrid necrosis in triticale complementing with cither one of the two genes, Ne1 and Ne2 which are known to cause hybrid necrosis in wheat. It is suggested, that the two genes in rye are named Ner1 and Ner2 corresponding to the wheat gene with which they complement in triticale. The consequences of the presence of necrosis genes in rye populations for breeding of rye are discussed.     

The importance of wild potato species resistant to the potato cyst nematode,Globodera pallida,pathotypes P4A and P5A,in potato breeding. II. The crossability of resistant species

Summary Over 2400 pollinations were made to investigate the crossability relationships between cultivated potatoes, and wild diploid species from Series Tuberosa and Circaeifolia, as well as wild polyploid species in Series Tuberosa and Longipedicellata resistant to potato cyst nematode, Globodera pallida pathotypes P₄A and P₅A. Wild diploids in Series Tuberosa crossed easily with cultivated diploid species, except with Solanum lignicaule where most pollinations failed, and seed set was extremely low (0.2 seeds per pollination or less). It is suggested that this species is 1EBN. S. capsicibaccatum is clearly isolated from Series Tuberosa, but can form hybrids with S. lignicaule, which can act as a bridging species to S. tuberosum haploids. S. gourlayi and S. oplocense can be crossed with both subspecies of S. tuberosum, but S. papita, Series Longipedicellata is reproductively isolated from the tetraploid cultigens. The crossability data are discussed in the light of germplasm utilisation for breeding potato varieties resistant to potato cyst nematode.