Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8426890 | Theriogenology | 2018 | 24 Pages |
Abstract
Dystocic parturitions have an adverse impact on animal productivity and therefore the profitability of the farm. In this regard, accurate prediction of calving is essential since it allows for efficient and prompt assistance of the dam and the calf. Numerous approaches to predict parturition have been studied, among these, measurement of intravaginal temperature (IVT) is the most effective method at the field level. Thus, objectives of this experiment were, 1) to find an IVT cut-off to predict calving within 24â¯h, and 2) to clarify the use of IVT as an automated method of calving detection in housed beef cows. A commercial intravaginal electronic device (Medria Vel'Phone®) with a sensor that measures the IVT every 12â¯h was used. Piedmontese cows (nâ¯=â¯211; 27 primiparous and 184 multiparous) were included in this study. One-way analysis of variance was used to assess the temperature differences at 0, 12, 24, 36, 48 and 60â¯h before parturition. Receiving operator characteristic curves were built to determine the temperature cut-off which predicts calving within 24â¯h with the highest summation of sensitivity (Se) and specificity (Sp). Binomial logistic regression models were computed to identify factors that may affect the IVT before calving. Mean gestation length was 291.5â¯Â±â¯13.7â¯d (primiparous, 292â¯Â±â¯14.1â¯d; multiparous, 289â¯Â±â¯9.2â¯d). A decrease (Pâ¯<â¯0.001) in the average IVT was found from 60â¯h before calving until the expulsion of the IVT device. A significant (Pâ¯<â¯0.05) reduction in the IVT was noticeable from 24â¯h before until parturition. The IVT drop to predict parturition 24â¯h before calving was 0.21â¯Â°C (area under the curve [AUC]â¯=â¯0.72; Seâ¯=â¯66%, Spâ¯=â¯76%). Furthermore, the IVT cut-off value to predict parturition within 24â¯h was 38.2â¯Â°C (AUCâ¯=â¯0.89; Seâ¯=â¯86%, Spâ¯=â¯91%). None of the evaluated fixed effects (parity, dystocia, season or length of gestation) affected (P Ë 0.05) the IVT variation from 60â¯h before and up to calving. To conclude, the IVT average seems to be a better parameter than the drop in temperature to predict parturition within 24â¯h. In this regard, a cut-off of 38.2â¯Â°C showed a high Se and Sp for predicting calving. This study demonstrates the usefulness of a commercially available device to predict calving to improve management in stabled beef farms.
Related Topics
Life Sciences
Agricultural and Biological Sciences
Animal Science and Zoology
Authors
A. Ricci, V. Racioppi, B. Iotti, A. Bertero, K.F. Reed, O.B. Pascottini, L. Vincenti,