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Evaluation of infrared thermography combined with behavioral biometrics for estrus detection in naturally cycling dairy cows
ارزیابی ترموگرافی مادون قرمز همراه با بیومتریک رفتاری برای تشخیص فحلی در گاوهای شیری دوچرخه سواری طبیعی-2021 Low estrus detection rates (>50%) are associated to extended calving intervals, low economic profit and
reduced longevity in Holstein dairy cows. The objective of this study was to evaluate the accuracy of
infrared thermography and behavioral biometrics combined as potential estrus alerts in naturally (not
induced) cycling dairy cows housed in a tie-stall barn. Eighteen first lactation cows were subjected to
transrectal ultrasonography to determine spontaneous ovulation. The dominant follicle (DF) disappearance was used retrospectively as an indirect indicator of ovulation, and to establish the estrus period
(48–24 h prior the DF disappearance). Raw skin temperature (Raw IR) and residual skin temperature
(Res IR) were recorded using an infrared camera at the Vulva area with the tail (Vtail), Vulva area without
the tail (Vnotail), and Vulva’s external lips (Vlips) at AM and PM milking from Day 14 until two days after
ovulation was confirmed. Behavioral biometrics were recorded on the same schedule as infrared scan.
Behavioral biometrics included large hip movements (L-hip), small hip movements (S-hip), large tail
movements and small tail movements to compare behavioral changes between estrus and nonestrus
periods. Significant increases in Raw IR skin temperature were observed two days prior to ovulation
(Vtail; 35.93 ± 0.27 C, Vnotail; 35.59 ± 0.27 C, and Vlips; 35.35 ± 0.27 C) compared to d 5
(Proestrus; Vtail; 35.29 ± 0.27 C, Vnotail; 34.93 ± 0.31 C, and Vlips; 34.68 ± 0.27 C). No significant
changes were found for behavioral parameters with the exception of S-hip movements, which increased
at two days before ovulation (d 2; 11.13 ± 1.44 Events/5min) compared to d 5 (7.30 ± 1.02
Events/5min). To evaluate the accuracy of thermal and behavioral biometrics, receiver operating characteristic curve analysis was performed using Youden index (YJ), diagnostic odds ratio, positive likelihood
ratio (LR+), Sensitivity, Specificity and Positive predicted value to score the estrus alerts. The greatest
accuracy achieved using thermal parameters was for Res IR Vtail PM (YJ = 0.34) and L-hip PM
(YJ = 0.27) for behavioral biometrics. Combining thermal and behavioral parameters did not improve
the YJ index score but reduced the false-positive occurrence observed by increasing the diagnostic odds
ratio (26.62), LR+ (12.47), Specificity (0.97) and positive predicted value (0.90) in a Res IR Vtail PM, S-hip
AM, S-hip PM combination. The combination of thermal and behavioral parameters increased the accuracy of estrus detection compared to either thermal or behavioral biometrics, independently in naturally
cycling cows during milking.
Keywords: Combined-parameters | First-lactating | Movement-frequency | Preovulation | Skin temperature |
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