K R Petrovski1, C Heuer, T J Parkinson, N B Williamson. 1. Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North 4442, New Zealand. k.r.petrovski@massey.ac.nz
Abstract
AIM: To estimate the incidence of clinical mastitis and the frequency of isolation of mastitis-causing organisms from clinical cases in one lactation season (July 2005 to May 2006) on 14 dairy farms from the Northland region of New Zealand. METHODS: Cases of clinical mastitis were determined by trained farm personnel who recorded the identity of affected cows. Pooled milk samples from affected quarter(s) were aseptically collected by the farm personnel, for microbiology. Mean numbers of affected cows and quarters were compared at the population and farm level per 305 cow-days-at-risk (DAR). RESULTS: One or more cases of clinical mastitis occurred in 559/3,765 (14.8%) lactating cows. The average incidence of clinical mastitis was 0.19 cases per 305 DAR. The incidence in rear quarters (56.2%) was 1.3 times (p=0.027) that of front quarters (43.8%). The incidence of clinical mastitis and numbers of affected quarters were significantly influenced by the stage of lactation (higher in early lactation), age (higher in older cows) and farm. At the cow level, the most common isolates were Staphylococcus aureus (23.7%) and Streptococcus uberis (23.3%). No causative organisms were identified in 19.9% of the samples. Each cow had an average of 1.8 quarters affected during a case of clinical mastitis. CONCLUSIONS: This study demonstrated a higher incidence of staphylococcal clinical mastitis on dairy farms from Northland than has been reported in other regions of New Zealand.
AIM: To estimate the incidence of clinical mastitis and the frequency of isolation of mastitis-causing organisms from clinical cases in one lactation season (July 2005 to May 2006) on 14 dairy farms from the Northland region of New Zealand. METHODS: Cases of clinical mastitis were determined by trained farm personnel who recorded the identity of affected cows. Pooled milk samples from affected quarter(s) were aseptically collected by the farm personnel, for microbiology. Mean numbers of affected cows and quarters were compared at the population and farm level per 305 cow-days-at-risk (DAR). RESULTS: One or more cases of clinical mastitis occurred in 559/3,765 (14.8%) lactating cows. The average incidence of clinical mastitis was 0.19 cases per 305 DAR. The incidence in rear quarters (56.2%) was 1.3 times (p=0.027) that of front quarters (43.8%). The incidence of clinical mastitis and numbers of affected quarters were significantly influenced by the stage of lactation (higher in early lactation), age (higher in older cows) and farm. At the cow level, the most common isolates were Staphylococcus aureus (23.7%) and Streptococcus uberis (23.3%). No causative organisms were identified in 19.9% of the samples. Each cow had an average of 1.8 quarters affected during a case of clinical mastitis. CONCLUSIONS: This study demonstrated a higher incidence of staphylococcal clinical mastitis on dairy farms from Northland than has been reported in other regions of New Zealand.
Authors: Tariq Ali; Abdur Rahman; Muhammand Subhan Qureshi; Muhammad Tariq Hussain; Muhammad Shauib Khan; Siraj Uddin; Muhammad Iqbal; Bo Han Journal: Trop Anim Health Prod Date: 2014-07-16 Impact factor: 1.559
Authors: Paramanandham Krishnamoorthy; Kuralayanapalya P Suresh; Kavitha S Jayamma; Bibek R Shome; Sharanagouda S Patil; Raghavendra G Amachawadi Journal: Pathogens Date: 2021-04-30
Authors: Shirli Notcovich; Gina DeNicolo; Steve H Flint; Norman B Williamson; Kristene Gedye; Alex Grinberg; Nicolas Lopez-Villalobos Journal: Vet Sci Date: 2018-01-19
Authors: Vincent P Richards; Ruth N Zadoks; Paulina D Pavinski Bitar; Tristan Lefébure; Ping Lang; Brenda Werner; Linda Tikofsky; Paolo Moroni; Michael J Stanhope Journal: BMC Microbiol Date: 2012-12-18 Impact factor: 3.605