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Variability of the in vitro digestibility of standard herbage samples
Author(s) -
DHANOA M. S.,
DERIAZ R. E.
Publication year - 1984
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1984.tb01660.x
Subject(s) - zoology , biology , in vitro , environmental science , agronomy , genetics
The results or estimations of in vitro digestibility of three standard herbage samples, analysed weekly over about 48 weeks per year, have been examined using time‐series methods of Box and Jenkins to separate seasonal and non‐seasonal trends. The study includes data from March 1971 to February 1981. The dominant feature of variability is the seasonal component with a cycle of 52 weeks; no other significant cycles of longer periods were detected. The model of Box and Jenkins (1976) was found to be the most appropriate in describing the three series. A decrease in the in vitro digestibility of the low standard, which is 10 years old, occurred over the last year or so, although the reasons for this apparent storage effect are unknown.