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Evaluation of Short-Interval Milking as a Physiological Technique

Faculty of Rural Science

W. V. Candler

Faculty of Agricultural Economics, University of New England, Armidale, N.S.W., Australia

ABSTRACT

While attempting to evaluate short-interval milking as an experimental approach to problems in milk secretion in dairy cattle, Lakshmanan et al. (1) observed that certain factors appeared to influence the amount of milk and butterfat produced during two-hourly milking for a short period. Because of the possible importance of this technique, we should like to make the following comments on those aspects of the paper which we feel may lead to ambiguity in interpretation.

1. Production in any 24-hr. period can not be regarded as a valid response criterion; hence, the analyses of variance presented are based on "observations within plots" and are invalid. The three "experiments" were, in fact, three uniformity trials; the three observations on each cow provide only a single measure of the response to short-interval milking. Thus, two reasonable measures of response per cow would be,
or alternately,
That the three observations provide only one piece of information is obvious when it is considered that if, for any cow, the Period II observations were lost, the remaining observations on that cow would be meaningless.