Effect of Different Stages of the Lactation Period on Physicochemical Properties of Camel, Goat and Cow Milk

الموضوعات

علوم بحتة وطبيعية

الملخص

This research was conducted to study the effect of different stagesof the lactation period on physicochemical properties of three species,dromedary camel, saanen goat and cow milk during different lactationstages. The lactation period of each species was divided into three stagesafter calving, early, mid and late stages. Milk samples for each specieswere collected at different intervals during each stage and thus coveringthe whole lactation period. The samples were then subjected to laboratoryanalysis, which include compositional properties (Fat, Protein, Moisture,Lactose, Ash, Total solids and Solids not fat calcium, phosphorus, iron)and physical properties (pH, titratable acidity, electrical conductivity,specific gravity and freezing point).The obtained results indicated thefollowing:The mean fat % of camel, goat and cow milk obtained in earlystage of lactation period was 3.807±0.098, 2.933±0.126 and 4.407±0.263respectively. The statistical analysis revealed a high significant difference(P≤0.01) between the averages of the fat content of the different animals.In mid stage, means of 3.367±0.073, 5.020±0.149 and 3.787±0.356 forcamel, goat and cow milk were detected and were also highly significantdifference (P≤0.01). For late stage of lactation, average fat % of2.300±0.072, 3.580±0.047 and 4.367±0.352 was found in camel, goat andcow milk respectively. Similarly, high significant difference was noticedherby (P≤ 0.01).The protein content (%) of milk in early stage for camel, goat andcow was 3.087±0.092, 3.633 ±0.039 and 3.400±0.072 respectively.Values obtained were highly significant difference (P≤0.01). In mid stagewere 3.333±0.055, 3.267±0.089 and 3.540±0.065 for camel, goat andivcow milk respectively. A significant difference (P≤0.05) was noticed inthis case. Average values detected in late stage were 3.393±0.055,3.513±0.045 and 3.280±0.034 for camel, goat and cow milk respectively,and showed a significant difference (P≤0.05).The average moisture content (%) of camel, goat and cow milk inearly stage was 88.159±0.171, 87.974±0.175 and 87.957±0.159respectively, and no significant (P≥0.05) was revealed between theaverages. In mid stage mean values of 88.254±0.155, 87.714±0.133 and87.802±0.045 were obtained for camel, goat and cow milk respectivelyand there were highly significant difference (P≤0.01). In late stage meanvalues of 88.817±0.34, 87.569±0.106 and 87.802±0.045 were obtainedfor moisture content of camel, goat and cow respectively, with a highsignificant difference between the means (P≤0.01).Average total solids (TS) % for camel, goat and cow milk obtainedin early stage was 11.841±0.171, 12.026±0.175 and 12.043±0.159respectively. No significant difference was found herby (P≥0.05). In midstage was 11.746±0.155, 12.286±0.132 and 12.671±0.132 were obtainedand also highly significant differences were obtained (P≤0.01). In latestage mean values of 11.183±0.034, 12.431±0.106 and 12.198±0.045were reached and a high significant difference (P≤0.01) was noticed.The average lactose % of camel, goat and cow milk found in earlystage was 4.093±0.113, 4.651±0.071 and 3.491±0.071; in mid stage4.271±0.074, 3.356±0.088 and 4.603±0.097 and in late stage4.673±0.041, 4.557±0.097 and 3.807±0.097 respectively. A highsignificant difference (P≤0.01) was noticed between the averagepercentages of lactose for the three stages of the lactation period.vMean values of ash % found in early stage was 0.745±0.008,0.755±0.007 and 0.740±0.007 in camel, goat and cow respectively, withsignificant difference (P≤0.05). In mid stage mean value of 0.743±0.008,0.756±0.005 and 0.747±0.007, in late stage was 0.745±0.008,0.755±0.007 and 0.740±0.007 for ash % were reached for camel, goat andcow milk respectively. No significant difference (P≥0.05) was detectedbetween the average ash % in both mid and late stages of the lactationperiod. However, the calcium content (mg/100g) of camel, goat and cowmilk was highly significant difference (P≤0.01) in early, mid and latestages of the lactation period. Same was applicable for the phosphorusand iron contents.Mean values of the solid non fat (SNF) in early stage in camel milk8.035±0.174, in goat milk 9.092±0.080 and in cow milk 7.656±0.115. Inmid stage was 8.379±0.104, 7.266±0.156 and 8.891±0.092, in late stagewere 8.889±0.071, 8.851±0.093 and 7.831±0.104 for camel, goat andcow milk were recorded, a high significant difference (P≤0.01) wasrecorded between the means of the SNF throughout the three stages of thelactation period.Concerning physical properties; average pH values of camel, goatand cow milk in early stage obtained were: 6.584±0.019, 6.727±0.018and 6.440±0.042 respectively. A high significant difference (P≤0.01) wasdetected. In mid stage was 6.477±0.024, 6.573±0.042 and 6.600±0.041,in late stage were 6.486±0.042, 6.591±0.027 and 6.583±0.009 for camel,goat and cow milk respectively. The statistical analysis revealed asignificant difference (P≤0.05) between the means of pH in both mid andlate lactation stages.Average titratable acidity (as lactic acid) % obtained in early stage,was 0.161±0.003, 0.140±0.002 and 0.141±0.002 for camel, goat and cowmilk respectively, and showed a high significant difference (P≤0.01). Formid stage were 0.166±0.004, 0.154±0.004 and 0.169±0.003 respectively,indicating a significant difference (p≤0.05). In late stage were0.150±0.005, 0.175±0.002 and 0.156±0.005 for camel, goat and cow milkrespectively, with a high significant difference (P≤0.01).Mean values of electrical conductivity (mS) in early stage,6.553±0.124, 5.767±0.147 and 4.487±0.034, in mid stage was7.989±0.135, 5.798±0.073 and 5.453±0.091, and for late stage was7.965±0.086, 6.234±0.122 and 5.427±0.109 for camel, goat and cow milkrespectively. The statistical analysis showed a high significant difference(P≤0.01) between the means values during the three stages of lactationperiod.The specific gravity showed means of 1.0324±0.0003,1.0322±0.0003 and 1.0327±0.0003 for early stage; for mid stage,1.0318±0.0005, 1.0324±0.0005 and 1.0325±0.0004 and late stage,1.0326±0.0004, 1.0318±0.0004 and 1.0320±0.0004 for camel, goat andcow milk respectively, and no significant difference (P≥0.05) was noticedthroughout the three stages of the lactation period.Freezing point (̊C) showed an average of -0.543± 0.002,-0.472±0.073 and -0.549±0.001 in early stage, in mid stage was-0.546±0.002, -0.545±0.002 and -0.546±0.002. In late stage was-0.576±0.002, -0.576±0.002 and -0.576±0.002, with no significantdifference (P≥0.05) throughout the three stages of the lactation period.

روابط وملفات

التعريف والنوع

رقم الوثيقة

01411088-8b94-45f3-bcef-3cbb77a522ca

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

19200_1.pdf

بيانات النشر

ترجمة العنوان

أثر مراحل فترة الإدرار المختلفة في الخواص الفزیوكیمیائیة للبن الإبل والماعز والأبقار

ألقاب المؤلفين

[{"name_ar":"Ahmed Khalil Ahmed","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Amaal Osman ALatta Mohamed","title_ar":"اعداد","title_en":"Preparation"},{"name_ar":"Anas Mohamed Osman","title_ar":"اشراف","title_en":"Supervision"}]

اللغة

English

المصدر والدورية

اسم المصدر

Effect of Different Stages of the Lactation Period on Physicochemical Properties of Camel, Goat and Cow Milk

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

Ahmed Khalil Ahmed, Anas Mohamed Osman

الإعداد

Amaal Osman ALatta Mohamed

الاقتباسات الببليوغرافية