HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by De Boer, J. A. Articles by Grossman, M. Search for Related Content PubMed Articles by De Boer, J. A. Articles by Grossman, M.

Multiphasic Analysis of Milk and Fat Yield Curves of Israeli Holsteins¹

Department of Animal Sciences, University of Illinois, Urbana 61801

ABSTRACT

A multiphasic function was fitted to first through third-parity curves for milk and fat yields of Israeli Holsteins, grouped by yield and by days open classes. A triphasic function, the sum of three logistic functions, was fitted to milk yield curves, whereas a diphasic function, the sum of two logistic functions, was fitted to fat yield curves. For first parity milk, about 5% of yield occurred in first phase, about 25% in second phase, and about 70% in third phase. For first parity fat, about 14% of yield occurred in first phase and about 86% in second phase. Effect of yield was significant for initial, peak, and 305-d yields generally. Effect of days open generally was significant for time of peak yield and duration of each phase.

¹ Supported in part by the Illinois Agricultural Experiment Station, Hatch 35-0306, and by the Cornell National Supercomputer Facility, Ithaca, NY.

² Department of Animal Breeding, Wageningen Agricultural University, The Netherlands.

³ On leave from the Institute of Animal Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel. Supported in part by BARD Grant US-805-84.

⁴ Reprint requests.

This article has been cited by other articles:

				M. Grossman and W. J. Koops Modeling Extended Lactation Curves of Dairy Cattle: A Biological Basis for the Multiphasic Approach J Dairy Sci, March 1, 2003; 86(3): 988 - 998. [Abstract] [Full Text] [PDF]