Dairy
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Due to cows’ universal exposure to manure, which contains E. coli and other gram-negative bacteria, as well as the requirement to maintain sec as low as possible, all cows should be vaccinated with one of the coliform vaccines available on the market. These vaccines have been proven to significantly reduce clinical coliform mastitis and have been shown to be profitable when incidence of clinical coliform mastitis exceeds 1% of milking cows.
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The implementation of horn fly control measures, such as aerosols, bait, strips, foggers, dust bags, traps, oilers, ear tags, pour-ons, natural predators, and insect growth regulators is instrumental in reducing the new infection rate, while existing mastitis cases can be eliminated with antibiotic therapy. Such management practices will promote animal health and well-being, enhancing producer profits by ensuring that heifers calve with low sec and the potential for maximum milk yield.
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Prevalence of mastitis in dairy goats ranges between 5% and 30%, with Staphylococcus spp., otherwise known as the coagulase-negative staphylococci, identified as the most frequent cause of infection. These staphylococci produce persistent subclinical mastitis with markedly elevated somatic cell counts (SCC), which may lead to clinical symptoms.
Prevention is the key to controlling staphylococcal mastitis in dairy goats, as once this disease becomes established, chronic inflammation of mammary tissues and elevated SCC will follow, resulting in reduced milk yield and quality. This publication discusses proper husbandry practices and sanitation methods that can be implemented by producers. The results of two vaccine trials as a potential means to control mastitis in ruminants are also presented and discussed.
Vaccination should only be included as part of the whole herd approach to mastitis control. Any vaccination program must be carried out in conjunction with other proper management practices.
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Research has demonstrated that proper dry-off methods are vital in promoting udder health during the nonlactating period and at calving. For high producing cows, it may be necessary to decrease dietary energy over the last 1-2 weeks of lactation by increasing fiber and eliminating grain. Abrupt cessation of milking is probably as good as intermittent milking with a diet change for low and medium producing cows; however, intermittent milking is recommended for high producing cows to decrease milk yield and minimize leakage at dry-off, which could lead to mastitis. First lactation cows should be given a 50- to 60-day dry period, but multiparous animals fare well with a 35- to 45-day dry period. Selective dry cow therapy with non lactating cow antibiotics plus teat seal is as effective as blanket dry cow therapy with non lactating cow antibiotics plus teat seal for cows with SCC less than 200,000/ml. However, blanket dry therapy with both products is recommended for cows that dry off with greater than 200,000/ml. It is important to follow recommended infusion techniques to preserve the protective components of teat canal keratin and the sphincter muscle. And lastly, use of coliform vaccines will enhance immunity over the dry period and reduce clinical coliform mastitis in early lactation. This publication address these topics in more detail in order to help producers prevent mastitis in their dairy herds.
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When it comes to managing a dairy herd, infections and inflammation of the cow’s uterus can have negative implications for animal welfare, milk production, and rebreeding capacity. Maintaining uterine health is essential for proper ovarian function and the creation of a uterine environment that is favorable for successful pregnancy. Although all production species can suffer from disruptions to uterine health after parturition, the prevalence of endometritis is notably greater in dairy breeds when compared to other breeds of cattle. Producers should be willing and able to assess uterine health through reproductive records and visual observations (with or without additional tools), and work with their veterinarian for identification and treatment of subclinical cases of endometritis if an issue is apparent. This bulletin provides information on how to minimize the risk of endometritis.
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Vaccines are an integral part of a comprehensive herd health program. When used in conjunction with other management tools, vaccines can reduce both the risk and impact of disease in beef cattle herds. Nevertheless, when used inappropriately, vaccines can be virtually useless and, in some cases, result in impaired productivity and significant economic losses.
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Mastitis continues to be a major livestock disease afflicting the U.S. dairy industry. As the industry strives to improve milk quality to meet consumer as well as exportation demands, the legal limit for bulk tank sec will likely be reduced from 750,000/ml to 400,000/ml in the near future. It is estimated that between 10 and 20% of US dairy farms, mostly located in the Southeast, are currently at or above the 400,000/ml SCC limit and will have to adopt stricter methods for controlling mastitis in their milking herds, dry cows, and heifers.
This publication reviews the survey results of adoption rates for mastitis control measures and shows that there is much room for improvement.
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Prevalence of mastitis in unbred, breeding-age and pregnant dairy heifers is higher than formerly realized. Infected
mammary quarters, especially those with Staph. aureus IMI, exhibit reduced mammary gland secretory
potential, marked leukocyte infiltration and the accompanying inflammation. Both nonlactating and lactating
commercial antibiotic infusion products have been used successfully to cure existing infections and reduce SCC,
and nonlactating therapy prevents new IMI with environmental streptococci. However, the goal is to prevent
new infections from occurring in these young dairy animals through management strategies aimed at vaccination,
use of teat seals, fly control and dietary supplementation. As global milk quality standards
become more stringent, management practices based on curing existing infections and preventing new IMI
in heifers will ensure that these young dairy animals enter the milking herd free of mastitis and with low SCC.
Such practices should be considered for incorporation into dairy herd health programs in herds suffering from a
high prevalence of heifer mastitis, especially mastitis caused by Staph. aureus. Not only do these practices reduce
new infections in first-calf heifers at parturition, they also reduce the introduction of Staph. aureus to the milking
herd.|
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Cutting costs allows producers to survive during trying times and also teaches valuable lessons that may actually increase profits in future years. Cutting corners, on the other hand, may save some money in the short-run but ultimately will have very detrimental effects.
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