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Abstract

ABSTRACT


Background and Objective The quality of cow's milk from imported races is a new subject in the field of milk production in Algeria while taking into account the new breeding conditions these animals are subjected to. Consequently, this study aims to study the effect of one of these conditions, the lactation stage, on milk physico-chemical parameters along with its impact on Fatty Acids FA content. Methodology A group of 340 dairy cows were spread out over 3 dairy-farms located in the surrounding of Algiers. They were monitored for 10 month146s lactation at a rate of one sampling a month in order to cover 3 stages Early, mid and late lactation. Results The study showed that lactation stage significantly contributes p0.05 to variation of some physico-chemical parameters acidity, density and Fat Levels FL of milk delivered to local transformers. Milk FA profile significantly changed too p0.05 with a weak proportion of Saturated Fatty Acids SFA at early lactation, increasing very significantly p0.0002 at late lactation 60.73 vs. 66.16 respectively. The Short and Medium Chain Fatty Acids SMCFA, except for C40 were rather in weak proportion at early lactation stage and increased during the advance of the process. However, Long Chain Fatty Acids LCFA, particularly C180 and C181 showed an opposite tendency with a high proportion at early lactation. No lactation stage influence was shown on C182 and C183 contents p0.05. Conclusion By controlling the breeding conditions, the study showed that lactation stage significantly contributes to variation in Algiers milk fat composition and alters the activity of fatty acid pathways. Besides, milk will get interesting nutritional qualities.

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