Nutrient Intake, Excretion and Use Efficiency of Grazing Lactating Herds on Commercial Dairy Farms

Autor:	Sharon R. Aarons, Cameron J.P. Gourley, J. Mark Powell
Jazyk:	angličtina
Rok vydání:	2020
Předmět:	grazed pasture intake supplementary feed metabolizable energy feed nutrient intake macronutrients animal nutrient use efficiency manure nitrogen phosphorus potassium Veterinary medicine SF600-1100 Zoology QL1-991
Zdroj:	Animals, Vol 10, Iss 3, p 390 (2020)
Druh dokumentu:	article
ISSN:	2076-2615
DOI:	10.3390/ani10030390
Popis:	Estimating excreted nutrients is important for farm nutrient management, but seldom occurs on commercial grazing system farms due to difficulties in quantifying pasture intake. Nitrogen (N), phosphorus (P), potassium (K), sulphur (S), calcium (Ca) and magnesium (Mg) intake, excretion and use efficiency of 43 commercial dairy herds grazing pasture were calculated to understand the range in nutrient intake and excretion in these systems. Milk production, feed (grazed and supplement), as well as farm and herd management data were collected quarterly on representative farms located in temperate, arid, subtropical and tropical regions of Australia. Lactating herd sizes on these farms averaged 267 (30 to 1350) cows, with an average daily milk yield of 22 (9 to 36) kg/cow per day and the herds walked from
Databáze:	Directory of Open Access Journals
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