摘要:

Extract

ISSN:0048-0169    

DOI:10.1080/00480169.1989.35586

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

A case-control study of environmental and behavioural factors influencing foot lamehess was undertaken on 62 dairy herds comprising an average of 185 milking cows in Taranaki, New Zealand. Thirty two case herds were identified as having had at least 10 per cent of the cows lame during the milking season in which the herd was studied, and thirty control herds were selected on the basis that no more than 3 per cent of cows in these herds had been lame per year for at least two years immediately prior to investigation. Each herd was visited at both a morning and an afternoon milking, and 58 risk factors were measured between the time the farmer began to assemble the cows for milking and the completion of milking.

ISSN:0048-0169    

DOI:10.1080/00480169.1989.35587

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Two selenium (Se) supplementation trials were conducted in successive years involving a total of 70 red deer calves 3–15 months of age grazing pasture containing 30–57 ppb of Se on a dry matter basis. The trials compared growth rate, whole blood Se and glutathione peroxidase (GSHpx) concentrations of calves which received periodic doses of oral Se or a single injection of barium selenate (equivalent to 50 mg Se) or no Se supplementation. There were no significant weight gain differences between treated and untreated groups in either trial. Whole blood GSHpx levels were strongly correlated with blood Se levels (r = 0.9278) and produced the following regression equation: GSHpx 0.0155 Se − 2.292.

ISSN:0048-0169    

DOI:10.1080/00480169.1989.35588

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The persistent anthelmintic effect of ivermectin as a topical treatment at 500 µg/kg was evaluated against induced infections ofOstertagia ostertagi, Trichostrongylus axeiandDictyocaulus vivparusin calves. The results showed a highly significant (P<0.001) anthelmintic activity for at least 14 days againstO. oslertagiandT: axei(>99 per cent efftcacies) and for at least 28 days (98 per cent efficacy) againstD. viviparus.

ISSN:0048-0169    

DOI:10.1080/00480169.1989.35589

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

A survey of anthelmintic resistance on ten goat farms was carried out. The criterion for resistance was a faecal egg coynt reduction (FECR) of <90 percent based on arithmetic means of 11 to 19 goats per group. It was found that nine of the ten farms harboured nematodes resistant to oxfendazole when used at Smg/kg although on two of these, the FECR's were 89.2 percent and 89.8 percent. Post treatment larval cultures indicatedHaemonchus, OstertagiaandTrichostrongyluswere the resistant genera involved. On none of the ten farms was resistance to oral ivermectin at 0.2mg/kg detected.

ISSN:0048-0169    

DOI:10.1080/00480169.1989.35590

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The mean serum folate concentrations of Large White sows were compared between one group of 13 animals, 43–80 days pregnant and another group of 9 animals at weaning when the litters were 28–30 days old. The mean concentration was higher in sows at weaning (p<0.05) and the lowest levels were found in sows no more than 51 days pregnant (p<0.05).

ISSN:0048-0169    

DOI:10.1080/00480169.1989.35591

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The investigation of five field cases of chronic copper poisoning in a group of 100 Angora kids is reported. Toxicity was confirmed by the demonstration of Heinz body anaemias, necrotizing liver disease, haemoglobinuric nephrosis and excessive levels of copper in blood, livers and kidneys. The dietary history of the kids is described. Tissue levels of copper and reported interactions between selenium, zinc and copper are discussed. Therapeutic and preventative measures are suggested.

ISSN:0048-0169    

DOI:10.1080/00480169.1989.35592

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

An osteodystrophy with features of both rickets and fibrous osteodystrophy was diagnosed in growing pigs housed indoors and fed on a diet deficient in vitamin D. Affected pigs were severely lame and preferred to remain recumbent. At necropsy, the long bones had reduced breaking strength and in one tive-month- old pig the articular surfaces of both proximal humeri were indented due to collapse of subchondral bone.

ISSN:0048-0169    

DOI:10.1080/00480169.1989.35593

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

A newly recognised caprine neuropathy is described in which goat kids developed rapidly progressive neurologic signs in association with widespread spinal cord neuronal degeneration and active demyelination.

ISSN:0048-0169    

DOI:10.1080/00480169.1989.35594

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Ovine scrapie was first recorded in Cyprus in 1985. Subsequently four dairy goats kept in two mixed flocks with affected sheep developed characteristic clinical signs similar to those seen in sheep. Fifteen goats from the two flocks were examined histologically and neurological lesions consistent with a diagnosis of scrapie were found in the four animals and in three others which had subsequently developed early neurological signs. These lesions were similar to those of naturally-affected sheep although neuronal degeneration and vacuolation were more severe in some cases.

ISSN:0048-0169    

DOI:10.1080/00480169.1989.35595

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor