摘要:

Extract

ISSN:0048-0169    

DOI:10.1080/00480169.1977.34384

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Two hundred and twenty seven dairy cows and heifers which had conceived at least 245 days previously were treated with dexamethasone alone (20 mg i/m), cloprostenol alone (500 µg s/c) or both drugs at different time-combinations in order to study the effect in terms of induction of parturition.

ISSN:0048-0169    

DOI:10.1080/00480169.1977.34385

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

One hundred and eight cows and 65 maiden heifers which were pregnant from 32 to 250 days were treated with 500 meg cloprostenol. Abortions occurred in 53 (49%) cows and 47 (72%) heifers, with 62% of aborted foetuses being expelled within 5 days of treatment. Of 96 pregnancies treated before 150 days, 86 (89.5%) were terminated. Luteolysis, followed by oestrus and ovulation occurred in both those which aborted and those which did not, although serum progesterone levels and ovarian palpations suggest that luteolysis was not complete in those animals which maintained pregnancy. Abortions occurred in only 2 of 51 cows at 151 – 250 days pregnancy, while 12 of 26 similar pregnancies were terminated in heifers. Reasons for this difference are discussed, as are possible methods for improving the success rate in aborting pregnancies between 151 – 250 days.

ISSN:0048-0169    

DOI:10.1080/00480169.1977.34386

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Fenbendazole had no significant effect on numbers of naturally-acquired, inhibited, early-fourth-stageOstertagia ostertagiin 13- to 15-month-old steers. In six of the 12 animals dosed with this drug in two trials, total counts ofO. ostertagiremaining exceeded 34 000, the highest being 108 000.

ISSN:0048-0169    

DOI:10.1080/00480169.1977.34387

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

ISSN:0048-0169    

DOI:10.1080/00480169.1977.34388

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

A method of cannulating the small intestine of the calf is described. Indwelling cannulas gave direct access to the intestinal lumen and mucosa, providing direct study of intestinal function and morphology.

ISSN:0048-0169    

DOI:10.1080/00480169.1977.34389

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Extract

ISSN:0048-0169    

DOI:10.1080/00480169.1977.34390

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Extract

ISSN:0048-0169    

DOI:10.1080/00480169.1977.34391

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

2-Amino-5-chloro-3,4-dimethoxy benzyl alcohol (ACD-MBA), a compound similar to part of the substituted tryptophan in the sporidesmin molecule was synthetized. It was coupled to bovinegamma-globulin through azo linkages and used to immunize guinea-pigs and rabbits or coupled to various bacteria and used to immunize guinea-pigs. Antibodies to ACDMBA were demonstrated by a complement fixation test. Hapten-inhibition of complement fixation showed that the anti-ACDMBA antibodies cross-reacted with sporidesmin and some derivatives of sporidesmin.

ISSN:0048-0169    

DOI:10.1080/00480169.1977.34392

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The numbers of psychrotrophic fungi in various environments have been investigated as these fungi are potential meat spoilage organisms, carried into the freezing works on stock awaiting slaughter. Of a number of soils examined, those from urban and high-altitude areascontained the fewest psychrotrophic fungi. In rural soil samples the total psychrotrophic fungal population varied with the stocking intensity in the paddocks from which samples were obtained. Highest fungal counts were obtained for soils from stockyards. Cowhair, wool,and sheepskin all contained a variety of psychrotrophic species in moderate numbers.

ISSN:0048-0169    

DOI:10.1080/00480169.1977.34393

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor