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Composition and Characteristics of Ass's Milk

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Composition and Characteristics of Ass's Milk Composition and characteristics of ass’s milk Elisabetta Salimei, Francesco Fantuz, Raffaele Coppola, Biagina Chiofalo, Paolo Polidori, Giorgio Varisco To cite this version: Elisabetta Salimei, Francesco Fantuz, Raffaele Coppola, Biagina Chiofalo, Paolo Polidori, et al.. Com- position and characteristics of ass’s milk. Animal Research, EDP Sciences, 2004, 53 (1), pp.67-78. 10.1051/animres:2003049. hal-00890002 HAL Id: hal-00890002 https://hal.archives-ouvertes.fr/hal-00890002 Submitted on 1 Jan 2004 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Anim. Res. 53 (2004) 67–78 © INRA, EDP Sciences, 2004 67 DOI: 10.1051/animres:2003049 Original article Composition and characteristics of ass’s milk1 Elisabetta SALIMEIa*, Francesco FANTUZb, Raffaele COPPOLAc, Biagina CHIOFALOd, Paolo POLIDORIb, Giorgio VARISCOe a Dipartimento di Scienze Animali, Vegetali e dell’Ambiente, Università degli Studi del Molise, via De Sanctis, 86100 Campobasso, Italy b Dipartimento di Scienze Veterinarie, Università degli Studi di Camerino, via Circonvallazione 93, 62024 Matelica (MC), Italy c Dipartimento Scienze e Tecnologie Agro Alimentari e Microbiologiche, Università degli Studi del Molise, via De Sanctis, 86100 Campobasso, Italy d Dipartimento di Morfologia, Biochimica, Fisiologia e Produzioni Animali, Università degli Studi di Messina, Polo Annunziata, 98016 Messina, Italy e Isituto Sperimentale Zooprofilattico della Lombardia e dell’Emilia, via Bianchi n. 9, 25124 Brescia, Italy (Received 14 November 2002; accepted 10 October 2003) Abstract – Ass’s milk yield and chemical composition were investigated in two lactations at d 28, 45, 60, 75, 90, 105, 135 and 150 after parturition. Milk yield per milking (averaging 740 mL) of 6 asses of Martina Franca (n = 3) and Ragusana (n = 3) breeds, which quickly adapted to the milking machine procedures, increased in the second (or third) milking per day but was unaffected by stage of lactation or breed. Year of lactation, stage of lactation, breed and milking time did not influence the gross composition of the milk, except for fat and protein contents. The overall average protein percentage (1.72 g·100 g–1 of milk), showing a significant negative trend throughout lactation, was characterised by low casein (47.3% of crude protein) and whey protein contents (36.9% of crude protein). A specific whey protein profile was also found, being the relative percentage on total whey protein 4.48%, 6.18%, 29.85%, 21.03% and 22.56% for respectively lactoferrin, serum albumin, β-lactoglobulin, lysozyme and α-lactoalbumin. The low average fat content of ass’s milk (0.38 g·100 g–1 of milk), showing a high individual variability, was significantly affected by the year of the study; the lipid fraction was also characterised by high levels of linoleic (average 8.15 g·100 g–1 of total fatty acids) and linolenic acid (average 6.32 g·100 g–1 of total fatty acids). The ash content of ass’s milk (0.39 g·100 g–1 of milk) was constant throughout the experimental period and showed high levels of Ca and P, the ratio of which, ranging between 0.93 and 2.37, was on average 1.48. ass’s milk / protein / fatty acids / minerals Résumé – Composition et caractéristiques du lait d’ânesse. La production et la composition chimique du lait d'ânesse ont été évaluées sur deux lactations successives à 28, 45, 60, 75, 90, 105, 1 Some of these results were presented at the 4th Congress of the Società italiana di ippologia, Campobasso, Italy, July 2002. * Corresponding author: [email protected] 68 E. Salimei et al. 135 et 150 jours après la mise bas. Au total, 6 ânesses de race Martina Franca (n = 3) et de race Ragusana (n = 3), rapidement adaptées à la traite mécanique, ont été utilisées. La production laitière par traite et par jour (en moyenne 740 mL) a été supérieure lors de la seconde (ou troisième) traite. Elle n’a été affectée ni par le stade de lactation ni par la race. L’année de lactation, le stade de lactation, la race et l’heure de traite n'ont pas influencé la composition brute du lait sauf ses teneurs en lipides et en protéines. Le pourcentage de protéines (moyenne de 1,72 g·100 g–1 de lait) a eu tendance à diminuer significativement tout au long de la lactation, et a été caractérisé par une teneur réduite en caséine (47,3 % des matières azotées) et en protéines sériques (36,9 % des matières azotées). Un profil particulier des protéines sériques a été mis en évidence, avec un pourcentage relatif par rapport aux protéines sériques totales de 4,48, 6,18, 29,85, 21,03 et 22,56 %, respectivement, pour la lactoferrine, la sérum albumine, la β-lactoglobuline, le lysozyme et l’α- lactalbumine. La faible teneur du lait en matières grasses (0,38 g·100 g–1) a été caractérisée par une variabilité individuelle élevée. La fraction lipidique a présenté des niveaux élevés d’acide linoléique (moyenne de 8,15 g·100 g–1 d'acides gras totaux) et linolénique (moyenne de 6,32 g·100 g–1 d'acides gras totaux). Le contenu en cendres (0,39 g·100 g–1 de lait) n’a pas varié au cours de la période expérimentale et a été caractérisé par des valeurs élevées de Ca et de P, avec un rapport Ca/P compris entre 0,93 et 2,37 et une valeur moyenne de 1,48. lait d’ânesse / protéines / acides gras / minéraux 1. INTRODUCTION ties are also found among the lipids in milk [35]: the role of dietary fats in food-related Cow’s milk protein intolerance is the allergic symptoms requires particular atten- most frequent food intolerance in infancy, tion, since the pivotal role of fat-derived occurring in between 0.3 and 7.5% of the inflammatory substances is now acknowl- infant population [6]. In such cases, when edged [28]. breast feeding is not possible, a cow’s milk On the basis of the advantages recog- free diet often resolves symptoms, although nised in infant nutrition of the use of ass’s some infants can present intolerance to the milk, dietary and therapeutic properties of foods used as alternatives [7], including for- which have been known since ancient times mulas containing soy or hydrolysed protein [37], the present study was carried out to [26]. Recent clinical studies confirm ass's examine the quantitative and qualitative milk feeding as a safe and valid treatment characteristics of ass’s milk and their vari- of most complicated cases of multiple food ability, from newly machine-milked ani- intolerance [7]. However, information on mals. Besides the chemical composition ass’s milk composition [11, 26, 37, 43] is and some hygiene parameters, nitrogen and more limited than that on mare’s milk [18, lipid fractions were studied. 19, 29, 30, 33, 38], which has also been studied as an infant food [5, 15]. In addition, Carroccio et al. [6] suggest 2. MATERIALS AND METHODS the use of ass’s milk, though enriched with medium-chain triglycerides, in a cow’s 2.1. General (animals, housing and milk free diet in infancy because of its better feeding) palatability than semielemental milk for- mulas, its similar composition to human Six pluriparous asses (3 Martina Franca milk and its hormonal peptides, which stim- and 3 Ragusana breed) were used to pro- ulate the functional recovery and develop- vide milk samples in a study carried out ment of the intestine. Besides peptides over two consecutive lactations; two asses providing growth factors and protective (1 Martina Franca and 1 Ragusana), not factors, substances with bioactive proper- confirmed gravid, were replaced in the Composition and characteristics of ass’s milk 69 second year of the trial. The animals, sta- and appropriately preserved and stored bled with their foals in boxes provided until analysis. with a large external paddock, had never Refrigerated samples (4 °C) were ana- been milked before, and tested negative for lysed by IR (Milkoscan 605, Foss Italia) glanders, brucellosis and equine infectious calibrated according to FIL-IDF [22] for anæmia. In addition, the experimental ani- fat, crude protein (as N × 6.38) and lactose mals underwent preliminary examinations content. Dry matter (DM) content was and serological and laboratory evaluation measured following drying of weighted to make sure they were in a healthy condi- samples at 110 °C and ash content was tion. determined gravimetrically after ashing at Both the investigated lactations lasted 530 °C overnight; pH was measured poten- 150 days. For each lactation asses were tiometrically, and titratable acidity was machine milked at d 28, 45, 60, 75, 90, determined by the AOAC method [1]. –1 105, 120, 135 and 150 after parturition. Gross energy (kJ·kg ) was calculated with The pilot milking machine was a wheeled the coefficients reported by Perrin [39], i.e. trolley type with a sheep cluster; from the 9.11 for fat, 5.86 for protein and 3.95 for results of studies on dairy mares [42], oper- lactose. Milk hygiene and the healthy con- ating parameters were set at vacuum level dition of the udder were monitored respec- tively by total bacteria (Bactoscan, 8000) 42 kPa, pulse ratio 50% and pulse rate and somatic cell count (Fossomatic 360) of 120 cycles·min–1.
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