Efeitos da disponibilidade de sombra sobre o desempenho, atividades comportamentais e parâmetros fisiológicos de vacas da raça Pitangueiras

Silva, Érica Carla Lopes da; Modesto, Elisa Cristina; Azevedo, Marcílio de; Ferreira, Marcelo de Andrade; Dubeux, José C. B.; Schuler, Alexandre Ricardo Pereira

doi:10.4025/actascianimsci.v31i3.5279

Cited by 13 publications

(16 citation statements)

References 6 publications

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“…However, during the experimental period the THI values remained below 72, characterizing the thermoneutral conditions for dairy cows (SILVA et al, 2009).The minimum temperature recorded in the upper area of the udder was 31.17°C and the maximum 35.83°C. At the end of the teat, the minimum temperature recorded was 29.00°C and the maximum 34.80°C.…”

Section: Resultsmentioning

confidence: 99%

Udder Thermography of Gyr Cows for Subclinical Mastitis Detection

PORCIONATO

CANATA²,

OLIVEIRA³

et al. 2009

Revista Brasileira De Engenharia De Biossistemas

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Aiming to evaluate the infrared thermography technique for early detection of subclinical mastitis in Gyr cows, 70 animals were selected in 2 nd or 3 rd lactation, with an average production of 7.2 kg / d between 90 and 200 days in milking. Images of two quarters (front and backside) of the same udder side were monthly performed during three months using a thermal camera to evaluate the surface temperature at three different heights (upper, median and lower), totalizing 420 measurements. Milk samples from each quarter were also collected to evaluate the SCC and microbiological culture. The SCC did not influence udder temperature at different heights (p>0.05). However, temperatures among the regions of the quarter were different, the upper area had higher values than the median and lower regions (p<0.05). There was no difference in udder temperatures in relation to the type of microorganisms isolated in milk (p>0.05). The use of thermal camera allowed the identification of temperature variations of skin surface at different udder regions of Gyr cows. However, this technique was not effective in the detection of subclinical mastitis.Keywords: Gyr, Subclinical mastitis, Thermal camera, Dairy cows. 252 RESUMOCom o objetivo de avaliar a técnica de termografia infravermelho para detecção precoce de mastite subclínica em vacas da raça Gir, foram selecionadas 70 vacas de 2 a ou 3 a lactação, com produção média de 7,2 kg/dia, entre 90 e 200 dias de lactação. Imagens de dois quartos colaterais (anterior e posterior) do úbere, foram realizadas mensalmente, durante três meses utilizando uma câmera termográfica para avaliação da temperatura superficial em três alturas distintas (superior, medial e inferior), totalizando 420 avaliações. Também foram colhidas amostras de leite de cada quarto para avaliação da CCS e cultura microbiana. A CCS não influenciou a temperatura do úbere nas alturas estudadas (p>0,05). Porém, entre as regiões dos quartos houve diferença de temperatura, com valores mais altos na área superior (p<0,05) do que nas regiões medial e inferior. Não houve diferença de temperaturas no úbere em relação ao tipo de microrganismo isolado no leite (p>0,05). O uso da câmera termográfica permitiu identificar as variações de temperatura superficial da pele em diferentes regiões do úbere de vacas Gir. Porém, essa técnica não foi eficiente no diagnóstico da mastite subclínica.

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Section: Resultsmentioning

confidence: 99%

Udder Thermography of Gyr Cows for Subclinical Mastitis Detection

PORCIONATO

CANATA²,

OLIVEIRA³

et al. 2009

Revista Brasileira De Engenharia De Biossistemas

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“…Frequência e percentual em que os animais permaneceram em cada atividade nos tratamentos avaliados Em períodos de temperatura elevada e com ocorrência de chuvas situações características do verão nas condições tropicais, o SRAE poderia aumentar excessivamente a umidade relativa dentro da instalação. Essa umidade deve ser removida por meio de trocas de ar na instalação, pela ventilação forçada (Silva et al, 2009 resultados obtidos por Matarazzo et al (2007), observando que animais submetidos a sistema de resfriamento por ventilação e nebulização passaram mais tempo na área de alimentação (72,5 e 60,7 min) e de bebedouro (12,7 e 8,3 min), correspondendo a 3,3 e 2,2% do tempo total quando comparados com animais que não receberam resfriamento, respectivamente.…”

Section: Bunclassified

Comportamento, produção e qualidade do leite de vacas Holandês-Gir com climatização no curral

Almeida

Pandorfi

Barbosa

et al. 2013

Rev. bras. eng. agríc. ambient.

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RESUMOObjetivou-se, com este trabalho, avaliar o tempo de exposição dos animais ao sistema de resfriamento adiabático evaporativo no curral de espera sobre as variáveis meteorológicas (temperatura e umidade relativa do ar), comportamento animal, produção e aspectos qualitativos do leite de vacas Girolando, utilizando-se 16 vacas multíparas de composição genética 7/8 Holandês-Gir em lactação, com produção média de 18 kg de leite animal. O delineamento experimental utilizado foi o quadrado latino 4 × 4. O experimento teve duração de 56 dias, realizado durante o período de verão. Os tratamentos corresponderam aos intervalos de 10, 20 e 30 min de exposição à climatização e controle, sendo que o tempo de 30 min de exposição ao sistema possibilitou condicionamento térmico na segunda ordenha (turno da tarde), proporcionando aumento na produção de leite na ordenha seguinte de 0,640 kg animal -1 . Verificou-se maior percentual de tempo despendido com a ingestão de alimentos e ruminação (17,31 e 30,19%) no tratamento 30 min, comparativamente ao controle (15,50 e 27,37%), respectivamente. Não se verificou efeito significativo na composição do leite, entre os tratamentos. Palavras-chave: bem-estar animal, bovinocultura de leite, conforto térmico animalBehavior, production and milk quality of Holstein-Gir cows under acclimatization in the corral ABSTRACT This study was conducted with the objective to evaluate the duration of exposure of animals to the evaporative cooling system in the waiting barn on the weather variables (temperature and relative humidity), animal behavior, production and quality aspects of milk from Girolando cows. Sixteen multiparous lactating cows were used having a genetic composition of 7/8 Holstein-Gir and mean milk production of 18 kg animal -1 day -1 . A 4 x 4 Latin square design was used. The experiment was conducted during the summer season (February-March 2009) and lasted 56 days. The treatments consisted of different periods of 10, 20 and 30 minutes of exposure to acclimatization and control. Time of 30 minutes of exposure to thermal conditioning system enabled the second milking (evening shift), providing an increase in milk production in the next milking of 0.640 kg animal -1 . A higher percentage of time spent on food intake and rumination (17.31 and 30.19%) in 30 minutes treatment, compared to control (15.50 and 27.37%), respectively. There was no significant effect of treatments in the composition of milk.

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“…Under heat stress, animals change their behavior to reduce the amount of endogenous heat produced and promote heat loss (Schütz, Rogers, Cox, Webster, & Tucker, 2011). Thus, the daily grazing time is reduced, while the time spent for resting and drinking water increases (Perissinotto, Moura, Silva, & Matarazzo, 2005;Silva et al, 2009). Reduction in grazing activity decreases dry matter intake, with negative effects on body weight gain, milk yield, and reproductive efficiency, leading to economic losses resulting from such less than optimal herd performance (Almeida, Pandorfi, Guiselini, Henrique, & Almeida, 2011;Soren, 2012;Mellado et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Thermal comfort and grazing behavior of Girolando heifers in integrated crop-livestock (ICL) and crop-livestock-forest (ICLF) systems

Souza

Salman

Cruz

et al. 2019

Acta Sci. Anim. Sci.

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To compare the integrated crop-livestock-forest (ICLF) and crop-livestock (ICL) systems in relation to thermal comfort and grazing behavior of Girolando heifers, a 2 × 2 crossover trial (two system and two periods) was carried out with eight ¾ Holstein × ¼ Gyr heifers in Xaraés–palisade grass pasture under intermittent stocking with 10 days of occupation period and 20 days of resting. In ICLF, crown cover of eucalyptus planted in rows was 65% at the beginning of the experiment. Animal behavior was assessed through bioacoustics by recording heifers’ sounds for 48 hours. Concomitantly, heifers’ internal temperature (IT,°C) was recorded every 10 min using data logger thermometers adapted to hormone-free intravaginal devices. Air temperature and humidity data were collected by thermohygrometers located in the center of ICLF and ICL for calculating Temperature–Humidity Index (THI). According to THI values, ICLF and ICL did not vary in terms of thermal comfort. However, THI indicated moderate stress (82.26±4.40) during day (06:00 to 17:59h) and mild stress (75.76±4.38) at night (18:00 to 05:59h) in both systems. During day, heifers from ICL had significantly (p < 0.05) higher IT (39.51±0.56oC) than those from ICLF (39.41±0.56oC); the former spent more time grazing and less time drinking water in ICLF (581.35±30.1 and 4.87±1.09 min, respectively) when compared with those from ICL (436.88±28.1 and 10.25±1.09 min, respectively). Therefore, although thermal comfort index did not vary between the systems, under moderate stress, crossbred heifers have lower internal temperatures, resulting in longer diurnal grazing and shorter water drinking time in Eucalyptus-shaded pastures.

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Efeitos da disponibilidade de sombra sobre o desempenho, atividades comportamentais e parâmetros fisiológicos de vacas da raça Pitangueiras

Cited by 13 publications

References 6 publications

Udder Thermography of Gyr Cows for Subclinical Mastitis Detection

Udder Thermography of Gyr Cows for Subclinical Mastitis Detection

Comportamento, produção e qualidade do leite de vacas Holandês-Gir com climatização no curral

Thermal comfort and grazing behavior of Girolando heifers in integrated crop-livestock (ICL) and crop-livestock-forest (ICLF) systems

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