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E. Tahar and S. Abboud

Changes in the physiological status of an animal are reflected in changes in the levels of some of its physiological parameters, such as temperature, heart rate, etc. Therefore, detection of events such as illness, parturition, estrus or stress conditions that affect the physiological status will be possible if these parameters are monitored continuously and interpreted in real time. The basic physiological parameters in cattle are now monitored continuously by a system that was developed by Veterix®, Israel. The system comprises capsules, which are inserted through the mouth to the reticulum of the cows and record at 5-min intervals the following physiological parameters: heart rate (HR), respiratory rate (RR), interval between rumen contractions and rumen temperature (Tr). These data are transmitted by RF communication to a central computer unit that stores and interprets the data to produce a set of alerts for the herd manager. According to this system, Tr was about 0.6°C greater than vaginal temperature. This higher level sharply dropped for a short while after the animal had drunk water. This higher level of Tr, was probably due in part to heat produced by rumen fermentation. The sequence of changes in parameter levels following exposure to a short period of heat load was compared to that during natural estrus: during estrus a simultaneous rise of HR, RR and Tr was evident, but when a cow was exposed to heat load, its first response was to increase its HR considerably; later the HR decreased to a level lower than the initial one, simultaneously with a sharp increase of RR and a moderate increase of Tr, which was interrupted by Tr drops due to more frequent drinking. We suggest that the first response of a cow to heat load is to increase blood flow to the skin in order to increase heat dissipation. When this cooling was not sufficient, HR was decreased as a result of the animals’ effort to reduce intrinsic heat production, and RR is increased to enhance evaporative heat dissipation from the lungs.

Abstract no. M240

פותח על ידי קלירמאש פתרונות בע"מ -
הספר "אוצר וולקני"
אודות
תנאי שימוש
Responses of Physiological Parameters in Cattle to a Short Period of Induced Heat Load [abstract]

E. Tahar and S. Abboud

Responses of Physiological Parameters in Cattle to a Short Period of Induced Heat Load

Changes in the physiological status of an animal are reflected in changes in the levels of some of its physiological parameters, such as temperature, heart rate, etc. Therefore, detection of events such as illness, parturition, estrus or stress conditions that affect the physiological status will be possible if these parameters are monitored continuously and interpreted in real time. The basic physiological parameters in cattle are now monitored continuously by a system that was developed by Veterix®, Israel. The system comprises capsules, which are inserted through the mouth to the reticulum of the cows and record at 5-min intervals the following physiological parameters: heart rate (HR), respiratory rate (RR), interval between rumen contractions and rumen temperature (Tr). These data are transmitted by RF communication to a central computer unit that stores and interprets the data to produce a set of alerts for the herd manager. According to this system, Tr was about 0.6°C greater than vaginal temperature. This higher level sharply dropped for a short while after the animal had drunk water. This higher level of Tr, was probably due in part to heat produced by rumen fermentation. The sequence of changes in parameter levels following exposure to a short period of heat load was compared to that during natural estrus: during estrus a simultaneous rise of HR, RR and Tr was evident, but when a cow was exposed to heat load, its first response was to increase its HR considerably; later the HR decreased to a level lower than the initial one, simultaneously with a sharp increase of RR and a moderate increase of Tr, which was interrupted by Tr drops due to more frequent drinking. We suggest that the first response of a cow to heat load is to increase blood flow to the skin in order to increase heat dissipation. When this cooling was not sufficient, HR was decreased as a result of the animals’ effort to reduce intrinsic heat production, and RR is increased to enhance evaporative heat dissipation from the lungs.

Abstract no. M240

Scientific Publication
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