Early prediction of lactation persistency of multiparous cows managed for extended lactation - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Conference Poster Year : 2023

Early prediction of lactation persistency of multiparous cows managed for extended lactation

Abstract

Early prediction of lactation persistency will potentially be an important management tool influencing decisions on reproduction and feeding management. Primiparous cows have a relatively stable and high persistency while it is quite variable for multiparous cows. Therefore, the objective was to predict multiparous cows’ lactation persistency, within the first 6 weeks of lactation, based on two or three variables. The dataset used contained 19 production data and blood biomarkers of 36 multiparous Holstein cows managed for extended lactation (insemination at 8 months) with access to a milking unit. The persistency was calculated as the ratio of total milk produced during a defined period of 100 days (P1: from 100 to 200 days, P2: from 200 to 300 days, or P3: from 300 to 400 days) over the first 100 days of production (Method 1); as the quantity of milk produced at day 100, 200, 300, or 400 over the quantity produced at day 60 of lactation (Method 2); and as the slope of the smoothed milk yield curve at day 100, 200, 300, and 400 (Method 3). For each method, the cows were divided into 3 groups (12 cows per group) with a low, medium or high persistency. A clustering method (k=3) was then applied on a pair or trio among the data measured at week 1, 3, or 5. Using a trio of variables to predict persistency only improved the maximum accuracy of 3.7% (average over the methods, weeks and periods) compared to a pair of variables, and the highest accuracy obtained with a pair of variables varied from 43 to 70%. With a pair of variables, the highest accuracy was obtained with Method 1, considering milk yield and lactose in milk measured at week 1 to predict the persistency over P3. The second best pair belonged to Method 3 and involved dry matter intake and milking frequency measured at week 5 to predict persistency over P1. To conclude, Method 1 gave the highest accuracies and with this specific data set, a pair of variables in early lactation may be used to predict the persistency of the lactation at different stages of the lactation with a moderate accuracy.
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Dates and versions

hal-04286683 , version 1 (15-11-2023)

Identifiers

  • HAL Id : hal-04286683 , version 1

Cite

Charlotte Gaillard, Marion Boutinaud, J. Sehested, Jocelyne Guinard-Flament. Early prediction of lactation persistency of multiparous cows managed for extended lactation. 74. Annual meeting of the european federation of animal science (EAAP), Aug 2023, Lyon, France. Wageningen Academic Publishers, Book of abstracts, 29, pp.793, 2023, Book of abstracts of the 74th annual meeting of the european federation of animal science. ⟨hal-04286683⟩
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