University of Khartoum

Factors Affecting Milk Yield, Composition and Lactation Curve of the Shecamel

Factors Affecting Milk Yield, Composition and Lactation Curve of the Shecamel

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Title: Factors Affecting Milk Yield, Composition and Lactation Curve of the Shecamel
Author: Yousuf, Enaam Mohammed Idrees
Abstract: The main objectives of this study were to identify the factors affecting composition, determine the lactation curve and define factors affecting production performance and lactation curve parameters of camel milk in the Sudan. Records of 22 lactating she-camels, covering the period 2011- 2014, were collected; 15 of them records were from the farm of the Camel Research Centre (CRC) of the University of Khartoum and 7 records were from the farm of Tumbool Camel Research Center (TCRC) of the Animal Production Research Corporation. Camels of CRC were assigned to semi -intensive management (semi- closed), and camels of TCRC in an intensive system of management (closed). Milk samples were collected from 8 she-camels from CRC farm for testing composition. The lactation curve was determined according to Wood function. T test was performed to assess the impact of the management system on production performance, lactation curve parameters, and analysis of variance was run to determine the factors affecting milk composition. The average total milk yield, daily milk yield and lactation length were 1378 liter, 3.89 liter and 347.45 days, respectively. The intensive system boosted significantly (P<0.01) total milk yield compared to the semi- intensive system (2386.29 liter versus 907.00 liter), daily milk (6.22 liter versus 2.80 liter) and insignificantly increased lactation length (391.00 versus 328 days). There were significant and positive phenotypic correlations among milk x production traits. The lactation curve parameter, α (initial milk yield) was 4.21 liter/day in intensive system and 2.10 in semi- intensive system. The corresponding values of β (increasing slope) were 1.00 and 0.86); and the values of γ (decreasing slope) were -0.08 and -0.08. The parameters for time to reach peak yield (weeks) were 11.72 and 11.23. The corresponding values of persistency were 169.77 and 128.90. The values of the coefficient of determination (R2) were 0.64 and 0.74, respectively. The average chemical properties of camel milk were: 13.62% Total solids, 4.35% protein, 4.59% fat, 0.84% ash, 3.79% lactose and 0.19 acidity. The results showed that the half of udder and camel ecotype had insignificant influence on the above studied chemical properties, with the exception of ash which was significantly affected by camel ecotype. The stage of lactation significantly (P<0.01) influenced total solids and fat contents, while protein, lactose, ash content and acidity were insignificantly (P0.05) affected by the stage of lactation. Milk performance was higher in the intensive system than in the semi- intensive system, and the lactation curve model (incomplete gamma) used in this study was suitable and appropriate.
URI: http://khartoumspace.uofk.edu/123456789/16960
Date: 2015-11-11


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