Composition physico-chimique des différents laits de la plaine de la Bekaa : composition et caractéristiques rhéologiques des différents beurres produits

Abstract : Cows' milk characteristics, milk fat and the rheological properties of different produced butters in four different regions in the Bekaa valley in Lebanon have been studied. Major milk components, milk fats and butter characteristics have shown significant seasonal and regional variations. The major milk components were high during the cold period due to the minimal milk production and the feed composition. Two different peaks of the somatic cell count have been noticed: the first during the fall season related to the hygiene situation of the farms and the second during the spring season related to the high calving rate. The short chain fatty acids were high during the cold period due to the stage of lactation. The long chain fatty acids variations were related to the feed composition. The solid fat content (SFC) and the fusion's enthalpy (J/g) of high melting triacylglycerols were high during the cold period in ail the districts with an exception in Central Bekaa where the impact of the feeding composition was clear. The butters' humidity was high during the hot season. Significant fluctuations of the rheological properties have been identified in fall season probably related to the triacylglycerols compositions' variations. Significant correlations were established between the rheological characteristics of butters (hardness, cohesiveness and suppleness) the composition and the characteristics of milk fat (short and long fatty acids and fusion's enthalpy oftriacylglycerols).
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http://docnum.univ-lorraine.fr/prive/INPL_T_2005_KAMLEH_R.pdf
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https://hal.univ-lorraine.fr/tel-01749987
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Submitted on : Thursday, March 29, 2018 - 12:35:10 PM
Last modification on : Monday, April 16, 2018 - 10:41:06 AM

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Rabih Kamleh. Composition physico-chimique des différents laits de la plaine de la Bekaa : composition et caractéristiques rhéologiques des différents beurres produits. Sciences agricoles. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL026N⟩. ⟨tel-01749987⟩

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