Lifetime survival of Jersey‐sired cows following natural challenge with facial eczema during first lactation

Autor:	S. M. Hickey, G. Denicolo, C. A. Morris, H. J. Tempero
Rok vydání:	2002
Předmět:	animal structures animal diseases Soil Science Outbreak Liter Plant Science Biology Heritability Animal science medicine.anatomical_structure Liver enzyme Lactation Immunology Herd medicine Facial eczema Animal Science and Zoology Agronomy and Crop Science
Zdroj:	Scopus-Elsevier
ISSN:	1175-8775 0028-8233
DOI:	10.1080/00288233.2002.9513506
Popis:	During a serious natural outbreak of facial eczema (FE) in March‐May 1989 in the Northland, Auckland, and Taranaki regions of New Zealand, over 1500 Jersey‐sired 1st‐lactation heifers in 60 spring‐calving herds were blood sampled between 24 April and the end of May. The objective was to monitor their response to the FE challenge, as measured by serum activity of the enzyme gamma‐glutamyltransferase (GGT); 43 (72%) of the herds contained heifers that had been exposed. In these herds, compared with the remaining ("non‐exposed") herds, the cumulative percentages of heifers (still present for the blood sample) which were culled or had died were not significantly affected by type of herd. In the exposed herds only, the difference in log e GGT between cows culled or dead by the end of the 1 st lactation and those that survived was 0.52 ± 0.23 log e i.u. litre–1 (P 100 i.u. litre–...
Databáze:	OpenAIRE
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