Comparative study of different systems of buildings for milk production with emphasis on the indexes of thermal comfort and on the economical characterization. / Estudo comparativo de diferentes sistemas de instalações para produção de leite tipo B, com ênfase nos índices de conforto térmico e na caracterização econômica.

AUTOR(ES)

Alexandre Porto de Araujo

DATA DE PUBLICAÇÃO

2001

RESUMO

The objective of the present work was to undertake a study of case comparing indexes of thermal comfort inside different installations for milking cows of Holstein Breed at two private properties in the region of Vale do Paraíba, São Paulo State, Brazil. The properties were close to each other and presented similar characteristics for topography and environmental conditions. The economical characterization of the properties aimed to identify the cost production for each system under consideration. The experimental treatments were (i) free-stall housing, (ii) tie-stall housing and (iii) stable for feed supplementation in comparison with the open field conditions. The environmental parameters measured were dry bulb temperature, black globe temperature, maximum &minimum temperature, relative humidity of the air and wind speed. The experimental period was realized during the summer of the year to 2000. The selection of the discomforting critical days considered the enthalpy associated with the dry bulb temperature of 24ºC and relative humidity of 76%. The evaluation of the thermal comfort included the following parameters: enthalpy, temperature-humidity index (THI), black-globe humidity index (BGHI) and globe temperature and humidity index (ITGU). The thermal comfort indexes did not indicate a significant difference (p <0.05) between the field and the stable for feed supplementation. The same indexes did not differentiate (p <0.05) the free-stall from the tie-stall housing. According to the methodology employed at this study, the stable was associated with thermal comfort indexes significantly worse (p <0.05) than the ones related to the other installations. Regarding economical aspects, the total cost of milk produced in all systems was higher than the amount received from the local cooperative.

ASSUNTO(S)

leite milk dairy cattle bovinocultura leiteira

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