摘要:

A postal survey of 400 beef farmers in the Hunterville and Gisborne districts sought to identify features of farms or management procedures that might influence the occurrence, transmission or severity of infectious bovine keratoconjunctivitis (IBK). The overall response rate was 72%.

ISSN:0048-0169    

DOI:10.1080/00480169.1986.35320

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

An investigation was undertaken to confirm the existence of a mebendazole-resistant strain ofOstertagiaspp. on a ram-breeding property in Taihape. The results indicated that while a strain ofHaemonchus conformsfrom this farm was highly resistant to mebendazole, an isolate ofOstertagiaspp. was fully susceptible. Possible reasons for the discrepancy between previous and present findings are briefly discussed.

ISSN:0048-0169    

DOI:10.1080/00480169.1986.35321

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A trial based on progesterone radioimmunoassay of milk samples is described. Samples from 2274 cows in 14 herds were collected on the day of insemination and 7, 23 and 30 days later, unless a return to service occurred before the designated sample date. Two additional samples were collected from cows which returned to service more than 35 days after the first service, one on the day of the return and another seven days later. All six samples from these cows were assayed for progesterone concentration.

ISSN:0048-0169    

DOI:10.1080/00480169.1986.35322

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

In nine of ten pre-calving dairy herds we found that herd magnesium (Mg) status could be determined with 95% confidence by measurements of serum Mg (S-Mg), urinary Mg fractional clearance ratio (FCR) or creatinine corrected urinary Mg concentration (CUM) from 10 representative cows. Our findings support clinical impressions that FCR and CUM are more sensitive than S-Mg as predictors of a positive production response to Mg supplementation of dairy cows. The available clinical data is not adequately controlled and there is a need for controlled production-response trials to refine interpretation and to confirm the predictive value of these tests. Pending such trials we suggest that mean FCR <10% or CUM <1.0 mmol/ℓ indicate that a positive response is likely.

ISSN:0048-0169    

DOI:10.1080/00480169.1986.35323

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Extract

ISSN:0048-0169    

DOI:10.1080/00480169.1986.35325

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Extract

ISSN:0048-0169    

DOI:10.1080/00480169.1986.35326

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Extract

ISSN:0048-0169    

DOI:10.1080/00480169.1986.35327

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor