Bulk Tank Milk Analysis: Factors Associated with Appearance ofMycoplasmasp. in Milk

Abstract

Factors associated with the presence of Mycoplasma sp. in bulk tank milk samples were evaluated from 664 herds during 2.25 years. Milk quality components were not strongly related to the presence of Mycoplasma sp. in bulk tank milk. The presence of other contagious mastitis pathogens, Staphylococcus aureus and Streptococcus agalactiae, was also not related to the presence of mycoplasma, suggesting that the aetiology and transmission of mycoplasma mastitis were different from transmission of other contagious mastitis pathogens. The occurrence of the first isolation of mycoplasma from a bulk tank was not correlated to season of the year. Mycoplasma in bulk tank milk samples were more likely to be found in herds shipping more milk, an indirect measure of herd size. This suggests that larger herds are more likely to have mycoplasma mastitis. However, the first appearance of mycoplasma mastitis in a bulk tank sample was followed by a sample without this pathogen in more than 60% of herds. Mycoplasma sp. was not detected in any herd a year after first isolation. These findings suggest that this pathogen could be controlled and eliminated from herds.

Determination of milk production losses in Valle del Belice sheep following experimental infection of Mycoplasma agalactiae

“…Several studies report that the presence of other contagious mastitis pathogens, as S. aureus, is not affected to the presence of mycoplasma, suggesting that the aetiology and transmission of mycoplasma mastitis are different from transmission of other contagious mastitis pathogens (de la Fe et al, 2009;Fox et al, 2003). Our data, here, shows that infection with these two microorganism leads to an increased impact on milk production due.…”

“…Discordant data about the effects of CA on milk composition are present in the literature: some authors reported significant effects (Burriel, 1997;Leitner et al, 2003) while other authors do not (de la Fe et al, 2009;Fox et al, 2003). The effect of mycoplasma infection on milk protein and casein percentages is probably due to reduced udder functionality, that leads to lower synthesis of casein and protein milk.…”

Mycoplasma Mastitis

“…28 Herd replacement cattle exposed to cattle outside the herd, either imported or reared off-site, increased with increasing herd size, a biosecurity risk factor. 29 It was found that herd size 10,30 and culling 30 were risk factors for increased herd prevalence of Mycoplasma mastitis. Presumably this is a result of herd expansion, the entrance of new cattle with symptomatic, or asymptomatic carriage of new strains of Mycoplasma sp into the herd.…”

“…First, a potential problem with Mycoplasma mastitis must be known and cows suspected of Mycoplasma mastitis must be identified and verified as diseased. Culture of bulk tank milk on a regular basis is a method to monitor a herd's Mycoplasma mastitis status, 10,16,81 and such regular sampling and culture of bulk tank milk as a monitor of Mycoplasma mastitis in a herd have been advocated. 52 It is generally believed that the culture of Mycoplasma sp from bulk tank milk is indicative of at least one herd cow having Mycoplasma mastitis, although a negative culture does not necessarily indicate that the herd is free of this disease.…”

Celularidade do leite e Unidades Formadoras de Colônias nas mastites causadas por Staphylococcus coagulase positiva e coagulase negativa

“…As contagiosas são as causadas por micro-organismos conhecidos como "vaca dependentes" que tem como reservatório a glândula mamária como Staphylococcus aureus, várias espécies de Staphylococcus coagulase negativa, Streptococcus agalactiae, Corybacterium bovis e Mycoplasma spp. (Fox et al 2003, Langoni 2013, que são transmitidas a partir de vacas infectadas para outras no momento da ordenha pelas mãos dos ordenadores, equipamentos de ordenha e outros fômites de uso comum entre os animais, e as ambientais, que são causadas por micro-organismos, cuja fonte primária é o próprio ambiente onde os animais são mantidos, como camas, sala de ordenha, entre outros, e a transmissão ocorre principalmente após a ordenha. Nesse caso, tem-se as enterobactérias, como Escherichia coli, Klebsiella pneumoniae, Enterobacter spp, Streptococcus uberis e Streptococcus dysgalactiae, Pseudomonas spp.,…”