226 INFLUENCE OF LACTATION ON COMPOSITION OF MARE'S MILK Zamfir MARCHIȘ 1 , Adina Lia LONGODOR 1* , Răzvan A. CODEA 2 , Igori BALTA 1 , Aurelia COROIAN 1 1 University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, Faculty of Animal Science and Biotechnology, 3-5 Mănăştur Street, Cluj-Napoca, Romania 2 University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, Faculty of Veterinary Medicine, 3-5 Mănăştur Street, Cluj-Napoca, Romania *Correspondent author email: lia_adina@yahoo.com Abstract Mare's milk is valuable because of its nutritional properties. It is used in human food and tartamente for various diseases. Mare milk changes its composition depending on the lactation. It has the lowest values in first and second lactation in lactating 3, the highest values. The fat content varies between 1.88 g/100 g (lactation 1) and 2.17 g/100 g (lactation 3). Milk protein varies between 1.74 g/100g (lactation 1) and 1.92 g/100 g (lactation 3). For colostrum, affecting all day postpartum physico-chemical parameters. The highest values for these parameters are within 3 days postpartum. On day 5, the low values are observed. The fat content of the colostrum varies between 2.85 g/100 g, on day 1, and 2.13 g/100 g, on day 5. Key words: mare milk, colostrum, fat, protein, lactose. INTRODUCTION Mare's milk is used in food, cosmetics and medical. It is used for various diseases (tuberculosis, liver disease, gastritis, allergies) (Doreau et al., 1989; Salhanov et al., 1979; Malacarne et al., 2002). Mare's milk composition (high content of protein and globulin, essential amino acids, fatty acids) it is advisable to cancer patients, people with low immunity, heart problems, those suffering from atherosclerosis (Kharitonova et al., 1978, Mao et al., 2009; Chen et al., 2010; Jirillo et al., 2010). Studies on the milk and colostrum from the mare are: the influence of lactation on the chemical composition of mare's milk; influence on nutrient colostrum postpartum day; mare's milk benefits; caseins in milk distribution; mare's milk protein (Wells et al., 2012; Salamon et al., 2009; Mateja et al., 2014; Solaroli et al., 1993; Malacarne et al., 2000; Klemen et al., 2011). Quality, composition and production of mare milk are influenced by: feed, race, maintenance conditions, the process of milking, milk preservation and thermal processes applied (Doreau et al., 1989; Uniacke-Lowe et al., 2010; Orlandi et al., 2003; Markiewicz-Keszycka et al., 2015; Cosentino et al., 2015; Caroprese et al., 2007). Aim of the study was to evaluate the influence of lactation and postpartum day on milk and colostrum from the mare. MATERIALS AND METHODS Sampling. Milk was collected from a total of 5 copies per lactation. And samples were collected according to the postpartum period (day 1, 3, 5). Were studied animals breed Semigreu Românesc. It was chosen race, Semigreu Românesc because heavy breeds have a higher milk production. Sampling was performed manually in sterile containers and stored in the cold until analysis. Physico-chemical analysis. Analysis of physico-chemical parameters of milk and colostrum from the mare were analyzed with the device Lactoscan S (Figures 1 and 2). Physico-chemical parameters are analyzed milk: fat, protein, lactose, and pH. Colostrum we have examined: fat, protein, lactose, dry matter and pH. Scientific Bulletin. Series F. Biotechnologies, Vol. XXIII, 2019 ISSN 2285-1364, CD-ROM ISSN 2285-5521, ISSN Online 2285-1372, ISSN-L 2285-1364