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Equations for estimating milk density at 4°C from fat, protein, and lactose and other solids (LOS) contents were developed based on data collected over a whole year from Ontario and Alberta milk producers. Density was measured by an Anton Par Model DMA 45 density meter. Although milk density was mainly explained by composition, including seasonal factors in equations increased accuracy. "Weight over weight" to "weight over volume" conversions of milk components employing the developed equations were equivalent to the calculation with empirical density. The average difference between estimated and actual w/v values was 0.000 with the standard deviation of 0.002. Density of producer milk at 4, 16, 28, and 40°C was determined, and an equation for density estimation at any temperatures between 4 and 40°C was constructed. A formula with a cubic term of the temperature exhibited the best density prediction with the standard deviation of residuals of 2.31 e-4.

Realiza-se um estudo das necessidades, demanda e uso de informaçao por parte de produtores de leite de ovelha e/ou de cabra, com base num universo de 36 produtores. Selecionaram-se aqueles indicadores que permitem elaborar um perfil destes produtores como usuários potenciais de informação. Os dados foram obtidos por meio de um questionário testado, previamente à distribuição, em entrevistas. Apresentam-se os resultados de acordo com os seguintes itens identificados: perfil da comunidade, comportamento informacional, demanda e necessidade. Trata-se de uma pesquisa realizada com o fim de detectar os produtos e serviços de informação necessários para os produtores no desenvolvimento da sua atividade. Incluem-se propostas a respeito. A study of needs, demand and use of information of goat and sheep milk producers based on a universe of thirty six producers. There were selected these indicators that allow to make a profile of these producers as potential users of information. The data were obtained through a tested questionnaire in interviews before their distribution. Results are presented according to the items which are wanted to identify: community profile, information behaviour, demand and needs of information. It is an study made with the objective of detecting information products and services needed for the producers to develop their activities. Proposals are included.