University of Khartoum

Study of Cortisol Hormone Concentration Level in Blood Plasma of Shami Cattle during Machine Milking With and Without Presence of Calves.

Study of Cortisol Hormone Concentration Level in Blood Plasma of Shami Cattle during Machine Milking With and Without Presence of Calves.

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Title: Study of Cortisol Hormone Concentration Level in Blood Plasma of Shami Cattle during Machine Milking With and Without Presence of Calves.
Author: Kaskous, S.; Al-Daker, M.B.; Fadlelmoula, A.A.
Abstract: This study was conducted at Deir Al-Hajar Shaml cattle research station, Animal Resources Research Administration, to test the possibility of machine milking of cows in the presence of their calves and without exposure to stress. Twelve primiparous Shami cows were randomly selected and divided into two groups of six each. Their cortisol hormone level in blood plasma during milking was determined and related to milk production. Machine milking was used with the first group in the presence of the calves, and in the absence of the calves in the second group. Milk production was estimated at weekly intervals. Blood samples were collected before, during and after end of milking (morning and evening), in the second half of the second month of lactation. Cortisol concentration was determined by means of ELlSA (Enzyme Linked Immuno-sorbant Assay) method. Analysis of variance was used to analyze the data. The level of cortisol concentrations in the first group ranged between 50 and 86 ng/ml, whereas in the second group the range was 97-113 ng/ml; the difference between the two groups was not significant. The second group showed a significant (P 0.05) difference of cortisol concentrations, before milking, during milking and after milking, between the morning and evening milking. This tendency was not shown by the first group except during milking between the morning and evening milking
URI: http://khartoumspace.uofk.edu/handle/123456789/17491
Date: 2015-12-10


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