Study on prevalence and bacterial etiology of mastitis, and effects of subclinical mastitis and stage of lactation on SC
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Study on prevalence and bacterial etiology of mastitis, and effects of subclinical mastitis and stage of lactation on SCC in dairy goats in Egypt Hany A. Hussein 1,2 & Mohammed T. Fouad 3 & Khaled A. Abd El-Razik 1 & Amal M. Abo El-Maaty 1 & C. D’Ambrosio 4 & A. Scaloni 4 & A. M. Gomaa 5 Received: 23 December 2019 / Accepted: 15 June 2020 # Springer Nature B.V. 2020
Abstract In Egypt, inadequate information on prevalence and epidemiology of caprine mastitis is available. This study was designed to investigate prevalence and etiological agents of caprine mastitis and assess the efficacy of somatic cell count (SCC) as marker of subclinical mastitis (SCM) in dairy goats. This study was carried out on 249 randomly selected lactating goats in different lactation stages and examined clinically. Of these animals, 477 milk samples were aseptically collected and screened for bacterial carriage. SCC was assessed in 234 apparently normal milk samples, and SCC ≥ 106 cells/ml was indicator for SCM. Prevalence of clinical mastitis (CM) was 33.73% and 16.87% at animal and udder-half levels, respectively. SCM was 52.56% in the apparently healthy halves. Culture results proved single infection in 49.69% of samples, mixed infection in 23.9% of samples, and 26.41% of samples were negative. Coagulase negative staphylococci (CNS) were the most predominant bacteria (58.75%), then Staphylococcus aureus (S. aureus) (24.375%), and Streptococci (1.875%) were the least. No significant difference was recorded between mean of SCC in bacteriologically positive and negative samples, neither in those with SCC ≤ 106 nor with SCC ≥ 106 cells/ml both in middle and late lactation stages. Besides, the percentage of animals harboring SCC ≥ 106 cells/ml and negative for bacteriology in late lactation stage was 3 times (28.57%) more than in midlactation (9.3%). We can assume that SCC is not proper indicator for intra-mammary inflammation (IMI) in goats, and bacteriological examination remains more efficient, despites being time consuming and expensive. Keywords Dairy goat . Subclinical mastitis . Somatic cell count . Diagnosis
Introduction * Hany A. Hussein [email protected] 1
Department of Animal Reproduction and AI, Veterinary Research Division, National Research Centre, El Buhouth st., Dokki, Giza 12622, Egypt
2
Key Laboratory of Diagnostic and Detective Technology, Department of Veterinary Research, Guangdong Haid Institute of Animal Husbandry and Veterinary (GHIAHV), Guangzhou 511400, China
3
Department of Dairy Science, Food Industry and Nutrition Division, National Research Centre, Giza 12622, Egypt
4
Proteomics and Mass Spectrometry Laboratory, Institute for the Animal Production System in the Mediterranean Environment (ISPAAM), National Research Council, 80147 Naples, Italy
5
Department of Mastitis and Neonatal Diseases, Animal Reproduction Research Institute, Agriculture Research Center, Giza, Egypt
Goat is one of the oldest domesticated animals since 8000 BC (Colledge et al. 2013) and use of its milk in dairy
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