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Economic evaluation of replacement rates in dairy herds part 1 reduction of replacement rates through improved health



Economic evaluation of replacement rates in dairy herds part 1 reduction of replacement rates through improved health



Livestock Production Science 6(1): 15-28



A model concerning the economic significance of improved health is examined. The age associated probability of disposal was included has also been included in the model. A reduction of the involuntary replacement rate was of major importance on the farm level. In the model a herd showing average herd life of 5.3 lactations will have approximately 20% more earned income each year than a similar herd with an average productive life of 3.3 lactations. The yield resulting from a longer herd life is subject to the law of diminishing returns. The economic importance of a long herd life appeared to be remarkably stable, i.e., hardly affected by: the average productive capacity of the herd as regards milk and/or meat; the presence of absence of a moderate genetic improvement (1% per annum) in milk yield; or changes in price ratios between milk and meat. In every case, cows showing an average production, and which did not have to be removed because of disease, had an optimum calculated herd life of 10-14 lactations. Some further potential uses of the model are stated.

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Accession: 005212460

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