Seasonal and other effects on copper and zinc concentrations in the wool of New Zealand Romney sheep

Autor:	G. A. Wickham, J. R. Stevenson
Rok vydání:	1976
Předmět:	Litter (animal) Ecology Domestic sheep reproduction Soil Science chemistry.chemical_element Plant Science Zinc Biology Romney sheep Copper eye diseases Animal science Stocking chemistry Wool Grazing Animal Science and Zoology Agronomy and Crop Science
Zdroj:	New Zealand Journal of Agricultural Research. 19:217-220
ISSN:	1175-8775 0028-8233
DOI:	10.1080/00288233.1976.10426768
Popis:	Wool copper and zinc concentrations were analysed in samples of wool clipped every 28 days from Romney sheep grazing at two stocking rates. Wool copper was depressed in the samples grown during July just before lambing (P < 0.05). No effect of stocking rate, age of ewe, or litter size could be established. Differences between sheep within treatments (P < 0.001) were marked Wool zinc was depressed by increased stocking rate (P < 0.05), a!1d the onset of wmter and/or pregnancy (P < 0.001). Older ewes had higher mean wool zinc values (P < 0.05). No between-sheep differences or effect of litter size could be established.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7ee879a1f8dee55a6f0bb9572cc31d5c https://doi.org/10.1080/00288233.1976.10426768 Zobrazit plný text záznamu