University of Khartoum

Investigations of factors affecting the udder health status of dairy cows in Thuringia

Investigations of factors affecting the udder health status of dairy cows in Thuringia

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Title: Investigations of factors affecting the udder health status of dairy cows in Thuringia
Author: Fadl-El-Moula, Abdel-Aziz Ahmed
Abstract: The objective of the present field study was to investigate the factors that influence the udder health status in Thuringia. 48 dairy farms were randomly selected for the study. In the period from June 98 to April 2000 64542 milk samples from 10741 dairy cows were randomly collected and subjected to a bacteriological investigation. The relevant recorded performance data were obtained from the national data center (VIT) at Verden. Suitable statistical analysis models were selected to test the effect of the management and the hygienic factors on infection rate, SCC and daily milk yield. The prevalence of the infection was 27.57% of the quarters and depending on the number of the affected quarters infection was detected in 77.21% of the animals. It was also found that 49.66% of the samples from the whole udder were positive. S. aureus and CNS were the most frequently isolated contagious pathogens with an udder and quarter prevalence of 28.70/35.50% and 26.60/32.70%, respectively. Followed by St. days. and EPS (environmental pathogens) with an udder and quarter prevalence’s of 12.90/13.90% vs. 9.0/10.60%, respectively. Throughout the lactations infection rate was higher in primiparous cows and lower in multiparous cows (1.32 and 1.24, respectively). However, SCC was higher in multiparous cows (5.27) and lower in primiparous cows (4.48). The daily milk yield followed the same trends as the SCC. Within lactation infection rate was higher in early stage of lactation (1.28) and lower thereafter (1.27). SCC was lower early in the lactation (4.85) and increased thereafter to reach 4.96 in the late stage of lactation. Daily milk yield reached the peak in the early stage of lactation (28.41 kg) and was lower in the late stage of lactation (19.52 kg). Concerning the management factors, farm bred cows had a significantly lower mean infection rate than purchased cows (1.29 and 1.33, respectively). The mean SCC was higher in farm bred cows (4.95) and lower in the purchased cows (4.83). However, daily milk yield was higher in farm bred cows than purchased cows (24.78 and 22.39 kg, respectively). IMI due to the effect of the herd size was significantly varied. Infection rate was 1.31 in the small herds and 1.24 in the large herds. The mean SCC (log) was 5.06 in the small herds and 4.58 in the large herds. Whereas the daily milk yield ranged between 23.30- 24.94 kg
URI: http://khartoumspace.uofk.edu/handle/123456789/17498
Date: 2015-12-10


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