摘要:

Extract

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34639

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The recent development of radioimmunoassay techniques to determine changes in blood hormone levels has increased our understanding of the endocrinology of the oestrous cycle and pregnancy in the mare. This review describes recent findings concerning the endocrine basis and treatment of some common types of infertility.

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34640

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Investigation of infertility in a beef herd suggested that IBR virus infection, spread by the bull to susceptible cows during natural mating, was a possible cause. Secondary bacterial infection may have contributed to the problem.

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34641

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A newly recognised problem of petechial haemorrhages in external adipose tissue of lambs was investigated at a meat works. The causal factor was electrical stunning, but animal- associated predisposing factors were also important as indicated by a decline in prevalence as the killing season progressed. It is suggested that these are associated with the age of the lambs and, thereby, the maturity of tissues. Histologically, the lesions showed focal capillary haemorrhage, platelet and fibrin thrombi, and concentration of leucocytes about the thrombus. Although this distribution superficially resembled a reactive change, it was concluded that it was an agonal lesion and suggested that the concentration of leucocytes was a result of a filtration phenomenon.

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34642

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0048-0169    

DOI:10.1080/00480169.1979.36669

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34643

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Calving was induced in 374 cows with either dexamethasone trimethyl acetate (O) or dexamethasone isonicotinate (V) as an initial injection. Cows that had not calved were injected 7–12 days later with betamethasone (B) or cloprostenol (E). The time from injection to calving was O, 7.7; V, 6.9; O + B, 12.9; O + E, 11.2; V + B, 11.4 and V + E, 11.4 days respectively. Calf mortality was O, 3; V, 8; 0 + B,27;0 + E, 23; V + B,34 and V + E, 29% respectively. Mortality was positively related to prematurity and negatively to birthweight. The overall incidence of retained foetal membranes was 25% and was not significantly different between treatments. There were no significant differences between induced cows and untreated herdmates calving at similar times in: days from calving to first oestrus (38 v. 39 days); percent of cows with premating oestrus (52 v. 51%); days from calving to conception (66 v. 69 days); and conception rate at first mating (57 v. 53%). Ten percent of induced cows and 3% of the controls did not become pregnant again(P <0.01). Milkfat production was 127 kg in 187 days for the controls and 121 kg in 181 days (P < 0.05) for the induced cows. Therefore O and V have similar actions as initial injections for induced calving; kB and E were effective as second injections with E causing a more concentrated calving. Milk production and fertility were slightly reduced in the induced cows compared with herdmate controls, but these effects were probably outweighed by the benefits of induced calving.

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34644

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34645

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Thehardjocomponent of a bivalentpomona/hardjovaccine was evaluated, using sheep. Nine sheep were vaccinated and 10 remained unvaccinated. All sheep were challenged with an intraperitoneal and intramuscular injection of ahardjoculture. After 13 weeks, the sheep were slaughtered and their kidneys cultured for leptospires.

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34646

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0048-0169    

DOI:10.1080/00480169.1979.34647

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor