Determinação Do Conforto Térmico De Vacas Leiteiras Utilizando a Mineração De Dados

Perissinotto, M.; Moura, Daniella Jorge de

doi:10.18011/bioeng2007v1n2p117-126

Cited by 34 publications

(20 citation statements)

References 9 publications

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“…Urine pH, RT, RR, and HR values were within normal range [35, 36] and indicate that heifers were healthy and unstressed. The variation in HR values, although statistically significant, was of small magnitude, within the physiological range and did not present a consistent dose-dependent variation.…”

Section: Discussionmentioning

confidence: 99%

OreganoExtract Added into the Diet of Dairy Heifers Changes Feeding Behavior and Concentrate Intake

Kolling

Panazzolo

Gabbi

et al. 2016

The Scientific World Journal

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This experiment aimed to describe the effects of Oregano extract (OE) inclusion into the concentrate fed to dairy heifers on physiological parameters, feeding behavior, intake, and performance. Thirty-two Holstein heifers were randomly distributed into four treatments: C = control, without addition of OE; OE2.5 = 2.5 g; OE5.0 = 5.0 g and OE7.5 = 7.5 g of Oregano extract per heifer/day. Feeding behavior and concentrate intake were assessed individually every day and total dry matter intake (DMI) was determined on the last week of the trial. Compared to control group, OE7.5 reduced by 32% the latency time to approach the feed bunk but increased by 6% the time spent eating the concentrate. Each inclusion of 2.5 grams of OE into the concentrate increased the occurrence of postingestive licking the feed bunk with abundant saliva production 1.2 times (P < 0.01) and tended to increase the occurrence of sneeze events 1.2 times (P < 0.10). No statistical difference was detected between treatments for total DMI, but concentrate DMI was 9% lower for OE7.5 when compared to control and OE2.5. The inclusion of 7.5 grams/day of OE causes small but negative effects in feeding behavior and concentrate intake, without change on total dry matter intake.

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Section: Discussionmentioning

confidence: 99%

OreganoExtract Added into the Diet of Dairy Heifers Changes Feeding Behavior and Concentrate Intake

Kolling

Panazzolo

Gabbi

et al. 2016

The Scientific World Journal

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“…The SHA + SPR and SHA + SPR + VEN systems reduced the DBt (°C) values to below the upper limit of the thermoneutrality zone, which, according to Perissinoto and Moura (2007), is close to 26°C, with its lower limit being 22°C. Similar reductions were found by Almeida et al (2010), who reported average DBt values of 24.3°C for 30 minutes of climatization with misting plus ventilation.…”

Section: Resultsmentioning

confidence: 94%

<b>Assessing different holding pen cooling systems through environmental variables and productivity of lactating cows

Silva

Passini

2017

Acta Sci. Anim. Sci.

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ABSTRACT. This studyaimed to assess different holding pen climatization systems for dairy cattle through environmental variables, milk production and economic indexes. Sixteen lactating cows were used, distributed in a 4 x 4 Latin square design consisting of four groups of four animals, assessed in four periods, seven days each, and in four holding pen environments: SUN-external environment (in the sun), SHA-80%-protection polypropylenemesh shading, SHA + SPR-80% polypropylene mesh shading + water sprinkling, SHA + SPR + VEN -80% polypropylene mesh shading + water sprinkling + ventilation. The animals remained for 30 minutes in their respective environments. In this period, environmental variables were collected using data loggers, and the milk produced, in kg, by each animal was subjected to the treatments. Fixed and variable costs were calculated for economic analysis. The SHA + SPR + VEN treatment presented itself as the best environment (p < 0.05), promoting an increase in the milk produced by the cows and in themonthly income, with 44 days for return on investment.Keywords: ambience, economic viability, dairy cows.Diferentes sistemas de resfriamento em sala de espera sobre variáveis ambientais e produtividade de vacas em lactação RESUMO. Este trabalho foi conduzido com o objetivo de avaliar diferentes sistemas de climatização em sala de espera para bovinos leiteiros, através das variáveis ambientais, produção de leite e índices econômicos. Foram utilizadas 16 vacas em lactação, distribuídas em um delineamento quadrado latino 4 x 4, constituído de quatro grupos de quatro animais, avaliados em quatro períodos, de sete dias cada e em quatro ambientes de sala de espera: SOL -ambiente externo (ao sol), SOM -sombreamento de malha de polipropileno 80% de proteção, SOM + ASP -sombreamento de malha de polipropileno 80% + aspersão de água, SOM + ASP + VENsombreamento de malha de polipropileno 80% + aspersão de água+ ventilação. Os animais permaneciam por 30 minutos em seus respectivos ambientes. Neste período, foram coletadas as variáveis ambientais, com o uso de data loggers, e a produção de leite, em kg, de cada animal submetido aos tratamentos. Foram calculados os custos fixos e variáveis para análise econômica. O tratamento SOM + ASP + VEN apresentou-se como o melhor ambiente (p < 0,05) promovendo aumento na produção de leite das vacas e na renda mensal, verificando-se um prazo de 44 dias para o retorno do investimento.Palavras-chave: ambiência, viabilidade econômica, vacas leiteiras.

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“…This step showed coefficients of determination very close to those on the previous step, confirming that the product was shown to be effective not only in laboratory conditions, but also in the field. After 40 min of acclimatization in the waiting corral, the equipment proved to be effective in controlling the ambient temperature, keeping it below the critical temperature exceeding 26 ºC (PERISSINOTTO & MOURA, 2007), with mean of 25.09 °C, in addition to ensure the degree of automation necessary for the intermittent operation of the actuators (Figure 12). The controller cost including manpower and all the electronic components needed for its operation was R$ 325.76 (Table 1).…”

Section: Resultsmentioning

confidence: 99%

Low cost driver device for microclimate maintenance in the pre-milking of dairy cattle

et al. 2013

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Due to the importance of the environment on animal production and thus environmental control, the study aims to build a system for monitoring and control the meteorological variables, temperature and relative humidity, low cost, which can be associated with an evaporative cooling system (ECS). The system development included all the stages of assembly, test and laboratory calibration, and later the validation of the equipment carried in the field. The validation step showed results which allowed concluding that the system can be safely used in the monitoring of these variables. The controller was efficient in management of the microclimate in the waiting corral and allowed the maintenance of the air temperature within the comfort range for dairy cattle in pre-milking with averaged 25.09 °C during the afternoon. The equipment showed the lower cost (R$ 325.76) when compared to other middle market (R$ 450.00).KEYWORDS: dairy cattle, thermal comfort, instrumentation. DISPOSITIVO CONTROLADOR DE BAIXO CUSTO PARA A MANUTENÇÃO DOMICROCLIMA NA PRÉ-ORDENHA DE BOVINOS LEITEIROS RESUMO: Devido à importância do ambiente na produção animal e, portanto, do controle ambiental adequado, objetivou-se com este trabalho a construção de um sistema de monitoramento e controle das variáveis meteorológicas, temperatura e umidade relativa do ar, de baixo custo, associado a um sistema de resfriamento adiabático evaporativo (SRAE). O desenvolvimento do sistema controlador compreendeu as etapas de montagem, teste e aferição em laboratório e, posteriormente, a etapa de validação do equipamento realizada a campo. A etapa de validação apresentou resultados que permitiram concluir que o sistema pode ser utilizado com segurança no monitoramento e controle dessas variáveis por meio dos atuadores. O controlador mostrou-se eficiente no manejo do microclima no curral de espera e permitiu a manutenção da temperatura do ar dentro da faixa de conforto para bovinos leiteiros na pré-ordenha, apresentando média de 25,09 ºC durante o turno da tarde. O equipamento apresentou custo inferior (R$ 325,76) quando comparado à média de outros no mercado (R$ 450,00).

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Determinação Do Conforto Térmico De Vacas Leiteiras Utilizando a Mineração De Dados

Cited by 34 publications

References 9 publications

OreganoExtract Added into the Diet of Dairy Heifers Changes Feeding Behavior and Concentrate Intake

OreganoExtract Added into the Diet of Dairy Heifers Changes Feeding Behavior and Concentrate Intake

<b>Assessing different holding pen cooling systems through environmental variables and productivity of lactating cows

Low cost driver device for microclimate maintenance in the pre-milking of dairy cattle

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