共查询到20条相似文献，搜索用时 33 毫秒
1.
G A Oakley 《The Veterinary record》1979,104(23):530-531
Congenital and probable developmental vestibular disease is reported in a litter of English cocker spaniel puppies. The syndrome was marked by loss of balance and ataxia initially, but subsequent compensation has left only one individual with "permanent" head tilt. 相似文献
2.
W M Frerichs A A Holbrook P C Allen 《Journal of the American Veterinary Medical Association》1976,168(1):53-56
Twenty Shetland ponies, 6 to 7 months old, were naturally infected with gastrointestinal nematodes and stomach bots. The ponies were allotted to 2 groups of 10 and were maintained on separate similar pastures that were free of infective larvae at the beginning of the study. The ponies in 1 group were treated monthly for 17 months with a therapeutic dose of a thiabendazole and piperazine mixture; those in the other group were not treated. During the 3rd and 5th months of the experiment, the ponies in the treated group were also given therapeutic doses of dichlorvos to remove bots. Various physical, hematologic, parasitologic, and blood chemical observations were made at weekly intervals. Each group of ponies was weighed at biweekly intervals. At the end of the experiment, the greatest differences between the treated and control ponies were in the mean number of worm eggs in fecal samples (0 vs 1,866 eggs/g), mean body weight (151.9 vs 117.0 kg), mean heart girth (126.5 vs 116.3 cm), mean packed cell volume (36.4 vs 30.8%), and mean serum protein content (8.47 vs 9.33 mg/100 ml), especially beta-globulin content (mean of 1.9 vs 3.4 mg/100 ml). The treated ponies remained clinically normal and were more spirited and more difficult to restrain for blood sampling and weighing than were the untreated controls. Parasitic nematode larvae were not recovered from grass samples from the pasture grazed by the treated ponies, but many such larvae (up to 500/300-g sample) were recovered from grass samples from the pasture grazed by the untreated ponies. 相似文献
3.
4.
W J Van Der Merwe A Eicker W F Marasas T S Kellerman 《The Onderstepoort journal of veterinary research》1979,46(1):19-25
A qualitative and quantitative survey was made of the aerospora above an Eragrostis curvula (Schrad.) Nees pasture. The pasture, which lay adjacent to a field of Panicum coloratum L. where an outbread of ovine photosensitivity had occurred, was not grazed during the survey. A Burkard volumetric spore trap was used to sample the aerospora continuously for 10 months. Twenty components of the aerospora were recognized: spores of 9 genera of fungi (Cladosporium, Alternaria, Epicoccum, Drechslera, Pithomyces chartarum (Berk. & Curt.) M. B. Ellis, Nigrospora, Sporormia, Curvularia, Spegazzinia); 8 recognizable but unidentified spore types; hyphal fragments and pollen grains. Cladosporium conidia comprised 83,37% of the total aerospora. Conidia of Pithomyces chartarum formed a small (0,29%) but significant component of the aerospora, since this fungus is known to cause hepatogenous photosensitivity. 相似文献
5.
6.
Abstract The chromosome numbers and reproductive variation of seven important pasture grasses from South Africa are compared. This comparison indicates that all these species form polyploid complexes, all reproduce both sexually and either apomictically or vegetatively, and some form of hybridization or cross‐fertilization occurs in each species. The ecological success of these species can, therefore, be attributed to the fact that they combine the advantages of polyploidy and apomixis and, at the same time, bypass the disadvantages with their hybridization potential. 相似文献
7.
8.
9.
Extract Sir, — In response to a number of requests to the Animal Remedies Board to explain the present situation regarding the application of selenium to pasture as a topdressing, it is hoped that the following will allay some of the fears that have been expressed and counter rumours which proliferate where facts are not completely known. 相似文献
10.
11.
12.
N D Levine D T Clark R E Bradley S Kantor 《American journal of veterinary research》1975,36(10):1459-1464
In a study of the relationship between pasture rotation in Illinois and acquisition of nematodes (mostly Haemonchus contortus) and body weight gains by lambs grazing with their ewes, 2 pasture rotation systems were tested. (1) Lambs and ewes were rotated through a series of 12 alfalfa-bromegrass-lespedeza pastures, each pasture being grazed for 3 to 4 days and rested for 5.5 weeks; 4 complete rotations were done during a 168-day grazing season. (2) Lambs and ewes were moved every 2 days, and 3 complete rotations of 50, 42, and 54 days, respectively, were done during the 146-day grazing season. The lambs under rotation had more nematodes and gained less weight than nonrotated control lambs, although rotation increased the amount of pasturage. Rotation is not recommended to control nematode parasitism of sheep in Illinois. 相似文献
13.
14.
15.
16.
17.
Residual ovine nematode pasture infections were assessed by grazing groups of ewes and their lambs on permanent sheep and cattle pastures and by the use of tracer lambs. Ostertagia spp., Cooperia oncophora, Nematodirus spp., Chabertia ovina and Trichuris spp. eggs and/or larvae survived on pastures overwinter. Second generation Ostertagia larvae were present in greatest numbers on pasture during the latter part of August and early September. The failure of a significant build-up of Cooperia oncophora was attributed to negligible worm egg output of this species in sheep. A build-up of Nematodirus spp. on pasture was not detected in this study. 相似文献
18.
19.
R K Barton L J Krysl M B Judkins D W Holcombe J T Broesder S A Gunter S W Beam 《Journal of animal science》1992,70(2):547-558
To compare the effects of time of daily protein supplementation on grazing behavior, forage intake, digesta kinetics, ruminal fermentation, and serum hormones and metabolites, 12 ruminally cannulated Holstein steers (449 and 378 kg average initial and final BW, respectively) were allotted to three groups. Treatments consisted of CON = no supplement, AM = cottonseed meal (.25% of BW) at 0600, and PM = cottonseed meal (.25% of BW) at 1200. Steers grazed a dormant (1.1% N) intermediate wheatgrass (Thinopyrum intermedium Host) pasture. Sampling trials occurred in December, January, and February. Supplementation altered (P = .01) time spent grazing; CON steers grazed approximately 1.5 h longer than supplemented steers. Supplemented steers lost less (P = .02) BW (-40 kg) than CON steers (-75 kg) did. Supplementation did not alter (P greater than .15) forage OM intake; however, total OM intake was greater (P = .01) for supplemented steers (22.3 g/kg of BW) than for CON (18.4 g/kg of BW) steers. Supplementation did not affect (P greater than .15) digesta kinetics. Extent of in situ NDF (96 h) and rate (%/h) of disappearance for supplemented steers was greater (P = .01) than for CON steers. Across all periods, ruminal NH3 N and total VFA concentrations were lower (P = .01) for CON steers than for supplemented steers. Serum insulin (ng/mL) concentration was lower (P = .03) and concentration of serum growth hormone (ng/mL) was higher (P = .02) for CON steers than for supplemented steers. Cottonseed meal supplementation enhanced utilization of intermediate wheatgrass; however, supplementation time had minimal effects on the variables measured. 相似文献
20.
种植业结构的调整和国家对生态环境建设的重视,使畜牧业在农业中的比重不断加大,就目前看,种草养畜是农村脱贫致富,农民增收的又一途径。但是,有些养殖户盲目种植不适宜本地生长和饲养家畜所需要的牧草,造成养殖成本提高,带来不应有的损失。现就怎样科学种植和利用牧草,谈几点建议。1 科学选择牧草品种 牧草的种植应从饲养畜种、土壤类型、气候条件3个方面选择。1.1 饲养畜种 饲养牛、羊,可种植紫花苜蓿、沙打 相似文献