Algebraic models of the lactation curves for milk, fat and protein production, with estimates of seasonal variation

Autor:	P. D. P. Wood
Rok vydání:	1976
Předmět:	Whole milk medicine.medical_specialty Animal science medicine.anatomical_structure Endocrinology Lactation Milk fat Internal medicine medicine Animal Science and Zoology Biology Seasonality medicine.disease
Zdroj:	Animal Science. 22:35-40
ISSN:	1748-748X 1357-7298 0003-3561
Popis:	SummaryThe lactation curves of whole milk production and of compositional quality measures may be represented by one of a family of curveswhere the coefficients a, b and c define the curve of production of a character y at week n.An analysis of protein results from over 600 000 cows, and of fat results from nearly 3000 cows gave shape coefficients (b, c) for fat percentage (-0·1316, 0·0154) and for protein percentage (-0·1223, 0·0109) showing that the lowest percentage of each occurred during weeks 8 and 11 of lactation respectively.Seasonal variations were calculated to show an expected deficiency of 0·93% fat in the spring and 0·75% protein in winter, which could be attributed to environmental influences associated with varying feeding standards.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ea361a694e80473fe3b5545439dfa01e https://doi.org/10.1017/s000335610003539x Zobrazit plný text záznamu