Infrared thermography reveals surface body temperature changes during proestrus and estrus reproductive phases in Gyr heifers (Bos taurus indicus)

Vicentini, Rogério Ribeiro; Montanholi, Y. R.; Veroneze, Renata; Oliveira, André Alves de; Lima, Maria Lúcia Pereira; Ujita, Aska; Faro, Lenira El

doi:10.1016/j.jtherbio.2020.102662

Cited by 20 publications

(18 citation statements)

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“…Following this reasoning, we expected VAGT to be greater in CON heifers, but surprisingly CHU heifers had greater VAGT compared to other treatments. Nonetheless, vaginal temperature can vary during the different stages of the estrous cycle [ 34 , 35 ] and we did not evaluate puberty status or followed the estrous cycle of the heifers enrolled in this study which could have affected our results.…”

Section: Discussionmentioning

confidence: 99%

Habituation Protocols Improve Behavioral and Physiological Responses of Beef Cattle Exposed to Students in an Animal Handling Class

Ujita

Seekford

Kott

et al. 2021

Animals

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Our objective was to determine the impact of different habituation protocols on beef cattle behavior, physiology, and temperament in response to human handling. Beef heifers were exposed to three habituation strategies: (1) tactile stimulation (brushing) in the working chute for seven consecutive days (STI; n = 18); (2) passage through the working chute for seven consecutive days (CHU; n = 19) and; (3) no habituation (CON; n = 19). Individual heifer respiratory rate (RR; n/min), internal vaginal temperature (VAGT; °C), and blood cortisol were measured. Further, behavior parameters were observed to generate a behavior score, and heifer interaction with students and their behavioral responses were recorded. Habituation with STI and CHU resulted in improved numerical behavioral scores compared to CON, and greater (p ≤ 0.05) handling latencies. Vaginal temperature was decreased in STI compared to CHU and CONT (p ≤ 0.05). Cortisol concentration did not differ among treatments, but decreased (p ≤ 0.05) from the start of the experiment to 14 days after treatment initiation. Both habituation protocols showed benefits, but heifers that received the positive tactile stimulation in the chute had the greatest behavior improvements. Furthermore, these heifers responded more calmly during student-animal interactions in class, which is beneficial for the students’ and animals’ safety.

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Section: Discussionmentioning

confidence: 99%

Habituation Protocols Improve Behavioral and Physiological Responses of Beef Cattle Exposed to Students in an Animal Handling Class

Ujita

Seekford

Kott

et al. 2021

Animals

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“…Both values obtained for taurine breeds are higher than those obtained in the present study. Using a larger dataset but including data from the present study, Vicentini et al [ 17 ] attributed the increase in RRT and rectal and vaginal temperatures to the occurrence of estrus.…”

Section: Discussionmentioning

confidence: 99%

“…The climate data including minimum and maximum environmental temperatures and relative air humidity were collected at the meteorological station of Instituto Nacional de Meteorologia (INMET), near the experimental area. The temperature-humidity index (THI) used in the present study was calculated as proposed by Mader et al [ 16 ] and described by Vicentini et al [ 17 ], as this environmental parameter can influence reticulo-rumen temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Artificial insemination was performed on day 11. Further information can be obtained from Vicentini et al [ 17 ].…”

Section: Methodsmentioning

confidence: 99%

“…The time when the first mount acceptance was observed was defined as the onset of estrus in each animal. Thus, the sexual behavior of females was recorded visually every 10 min by a group of eight trained observers, in six-hour shifts with two people at each time, over a period of 36 h for the determination of estrus onset [ 17 ]. Observations started 12 h after the removal of the progesterone implant (day 9) and finished at 48 h on AI (day 11).…”

Section: Methodsmentioning

confidence: 99%

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Estrus Prediction Models for Dairy Gyr Heifers

Andrade

Bernardes

Vicentini

et al. 2021

Animals

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Technological devices are increasingly present in livestock activities, such as identifying the reproductive status of cows. For this, predictive models must be accurate and usable in the productive context. The aims of this study were to evaluate estrus-associated changes in reticulo-rumen temperature (RRT) and activity (ACT) in Dairy Gyr heifers provided by reticulo-rumen boluses and to test the ability of different models for estrus prediction. The RRT and ACT of 45 heifers submitted to estrus synchronization were recorded using reticulo-rumen boluses. The means of RRT and ACT at different time intervals were compared between the day before and the day of estrus manifestation. An analysis of variance of RRT and ACT was performed using mixed models. A second approach employed logistic regression, random forest, and linear discriminant analysis models using RRT, ACT, time of day, and the temperature-humidity index (THI) as predictors. There was an increase in RRT and ACT at estrus (p < 0.05) compared to the same period on the day before and on the day after estrus. The random forest model provided the best performance values with a sensitivity of 51.69% and specificity of 93.1%. The present results suggest that RRT and ACT contribute to the identification of estrus in Dairy Gyr heifers.

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Effect of shading on the physiological and reproductive parameters in Nelore cows

da Silva,

da Costa e Silva,

Ferreira

et al. 2023

Trop Anim Health Prod

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This study aimed to evaluate the physiological and reproductive parameters of Nelore cows under different microclimatic conditions. The experiment was performed in Central Brazil, which has a tropical climate, dry winter, and rainy summer. The experimental groups were divided into an area with shading (5.8 trees/ha; n = 42) and an area with little shading (0.4 trees/ha; n = 42). We assessed physiological parameters (heart rate, respiratory rate, rectal temperature, surface body temperature, and vaginal temperature), and reproductive parameters (estrus detection, conception rate, and rate of pregnancy loss).Rectal temperature (p = 0.002), surface body temperature on the anks, forehead, and shoulder (p < 0.001), and vaginal temperature (p < 0.001) of cows in the group with shading was signi cantly lower those of cows in the group without shading. Estrus was higher (p = 0.08) in the cows of the shaded group; however, no effect was observed in conception and pregnancy loss rates. In conclusion, shading (5.8 trees/ha) provided better thermal comfort for Nelore animals in this tropical climatic region. However, it did not affect the performance of xed-time arti cial insemination.

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Infrared thermography reveals surface body temperature changes during proestrus and estrus reproductive phases in Gyr heifers (Bos taurus indicus)

Cited by 20 publications

References 42 publications

Habituation Protocols Improve Behavioral and Physiological Responses of Beef Cattle Exposed to Students in an Animal Handling Class

Habituation Protocols Improve Behavioral and Physiological Responses of Beef Cattle Exposed to Students in an Animal Handling Class

Estrus Prediction Models for Dairy Gyr Heifers

Effect of shading on the physiological and reproductive parameters in Nelore cows

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