Respostas fisiológicas e produtivas de vacas holandesas em lactação submetidas a diferentes ambientes

Martello, Luciane Silva; Júnior, Holmer Savastano; Silva, Saulo da Luz e; Titto, Evaldo Antônio Lencioni

doi:10.1590/s1516-35982004000100022

Cited by 61 publications

(63 citation statements)

References 13 publications

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“…This resulted in a 10% higher milk production in those cows with shade access, proving greater efficiency in the milk production of animals in thermal comfort. These results corroborate with that observed by Martello et al (2004), who showed to decrease in rectal temperature and respiratory rate, as well as superior milk production in Dutch cows kept in climatized environments.…”

Section: Meat and Milk Productionsupporting

confidence: 92%

Productive and reproductive performance, behavior and physiology of cattle under heat stress conditions

Alves

Andrade

Assis

et al. 2017

JABB

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This review aimed to detail the main information pertinent to the physiological and behavioral mechanisms evidenced in cattle under heat stress conditions. Brazilian cattle-breeding represents the second largest herd in the world, promoting great impact on the country's exports. Throughout their adaptability, these animals were submitted to different environments, which directly influence productive and reproductive performance, seeking compensatory mechanisms to maintain body homeostasis. Therefore, we can consider that heat stress directly affects the physiological and behavioral responses of cattle subjected to high temperatures. Adaptability of breeds to tropics should be considered of extreme importance in the choice of a productive activity for cattle-breeding and, particularly, in hot environments.

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Section: Meat and Milk Productionsupporting

confidence: 92%

Productive and reproductive performance, behavior and physiology of cattle under heat stress conditions

Alves

Andrade

Assis

et al. 2017

JABB

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“…In study with Nellore cattle, Costa (2013) reported an increase in surface temperature when these animals were transferred of the shade condition to the exposition to the sun. According to Martello et al (2004), values between 31.6°C and 34.7°C are considered normal for cattle bred in regions with hot climates. Overall, our results showed that even during the hottest time of the day (2:00 p.m.) the surface temperature was higher than the air temperature, although the difference was smaller, which favored the loss of heat by sensible processes.…”

Section: Resultsmentioning

confidence: 99%

Thermoregulatory responses of sindhi and guzerat heifers under shade in a tropical environment

Fonsêca

Cândido

Neto

et al. 2016

SCA

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This study characterized the thermal environment and assessed the physiological aspects of acclimatization of Sindhi and Guzerat heifers in a tropical environment (Brazil) under shade. Eight Sindhi and eight Guzerat purebred heifers (Bos indicus) had their physiological traits measured twice a day (9:00 a.m. and 2:00 p.m.). Environmental data during the experimental period were collected at two-hour intervals between 5:00 a.m. and 5:00 p.m. The temperature-humidity (THI) and the black globe temperature-humidity (BGHI) indices were calculated, and surface temperature (S t ), respiratory rate (R r ), and rectal temperature (R t ) were collected, being used to estimate heat loss by cutaneous (E c ) and respiratory (E r ) evaporation. In the warmer parts of the day (1:00 and 3:00 p.m.), the THI and BGHI reached values of 80.26 and 81.25, respectively. There was no significant difference in rectal temperatures between the breeds, but higher values were observed in the afternoon. Heat transfer by cutaneous evaporation reached 118.71±12.91 W.m -2 and 103.43±6.82 W.m -2 at 2:00 p.m. for the Sindhi and Guzerat heifers, respectively. Under these conditions (air temperature was between 29 and 30°C), 84% of the total latent heat loss in Sindhi and Guzerat heifers was represented by E c . It can be concluded that Sindhi and Guzerat heifers can maintain homeothermy with minimal thermoregulatory effort under shade conditions in a tropical environment.

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“…Segundo Martello et al (2004), para o período de lactação os limites ideais de temperatura ficam em torno de 4 a 24ºC. De acordo com Broucek et al (2009), a temperatura máxima crítica fica entre 24-27 °C.…”

Section: E-mailunclassified

Zoneamento Bioclimático Para Vacas Leiteiras No Estado Do Rio Grande Do Sul

et al. 2017

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RESUMO:O presente estudo teve como objetivo de estabelecer o zoneamento bioclimático para vacas leiteiras no estado do RS a partir do Índice de Temperatura e Umidade (ITU) e realizar a espacialização do déficit da produção de leite das vacas da raça Holandesa com nível de produção de 20, 25 e 30 kg dia -1 . O estudo foi realizado para 27 municípios do estado para os quais foi calculado o ITU a partir de dados de temperatura média compensada (TMC) e umidade relativa compensada (URC), referentes a última normal climatológica (1961 e 1990) disponível no site do INMET. Nos meses em que o ITU foi superior ao de conforto térmico foi calculado a déficit de produção de leite. Uma vez detectada a dependência espacial, produziu-se o mapa temático da distribuição espacial da variável por meio de krigagem ordinária. O modelo esférico foi o que melhor ajustou à semivariância experimental observada para o ITU, que apresentou dependência espacial com correlação significativa negativa entre os valores de altitude. O ITU foi superior a 70, considerado condição de alerta, em 18 municípios dos 27 avaliados, nos meses de dezembro, janeiro e fevereiro, chegando ao valor máximo de 75,4, na faixa de municípios situados na região sudoeste, com altitude de até 100 m. O déficit de produção de leite de vacas Holandesas, para um nível de produção de 20 a 30 kg dia -1 , em função de condições climáticas foi de até 4,20 kg dia -1 para o estado do RS. PALAVRAS-CHAVE:conforto térmico; índices de conforto térmico, geoestatística. BIOCLIMATIC ZONING FOR DAIRY COWS IN THE STATE OF RIO GRANDE DO SULABSTRACT: The objective of this study was to establish the bioclimatic zoning for dairy cows in the state of RS analyzing the temperature and humidity index (THI) and to perform the spatialization of milk production deficit of Holstein cows of 20, 25 and 30 kg day -1 . The study was performed in 27 state municipalities for those UTI was calculated from the data of compensated mean temperature (TMC) and compensated relative humidity (URC), referring to the last climatological normal data (1961 and 1990) available on INMET website. Once the spatial dependence was detected, a thematic map of the spatial distribution was generated using ordinary kriging. The spherical model was the best fit for the experimental semivariance observed for THI, which showed spatial dependence with significant negative correlation between altitude values. The THI was above 70, considered an alert condition, in 18 municipalities of the 27 evaluated, in the months of december, january and february, reaching a maximum value of 75.4, in the range of municipalities located in the southwest region, with altitude up to 100 m. The milk production deficit of Holstein cows, for a production yield of 20 to 30 kg day -1 , regarding the climatic conditions, was up to 4.20 kg day -1 for the RS state.

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Respostas fisiológicas e produtivas de vacas holandesas em lactação submetidas a diferentes ambientes

Cited by 61 publications

References 13 publications

Productive and reproductive performance, behavior and physiology of cattle under heat stress conditions

Productive and reproductive performance, behavior and physiology of cattle under heat stress conditions

Thermoregulatory responses of sindhi and guzerat heifers under shade in a tropical environment

Zoneamento Bioclimático Para Vacas Leiteiras No Estado Do Rio Grande Do Sul

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