Efficacy of antibiotic treatment at drying-off in curing existing infections and preventing new infections in dairy goats

Scott McDougall; Fiona Anniss

Efficacy of antibiotic treatment at drying-off in curing existing infections and preventing new infections in dairy goats

In: Mastitis in dairy production

Authors:

Scott McDougall

Scott McDougall Animal Health Centre, Morrinsville, New Zealand

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Fiona Anniss

Fiona Anniss Animal Health Centre, Morrinsville, New Zealand

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Type:: Chapter

Pages:: 523–528

DOI:: https://doi.org/10.3920/9789086865505_079

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Milk samples were collected from each gland of 476 dairy goats (n = 4 herds), 7 days prior to the end of lactation and again at the final milking of the lactation for bacteriology and somatic cell count (SCC). Animals were blocked by intramammary infection (IMI) status and age (1, 2, >2 years) and ranked on the average SCC of both glands within a doe. Half the goats were assigned to be treated by intramammary infusion with 300 mg of procaine penicillin, 100 mg of dihydrostreptomycin and 100 mg of nafcillin (Nafpenzal DC, Intervet, Auckland, New Zealand) and the others were left as untreated controls. Milk samples were collected between 0 and 4 days post-kidding and again 3 to 4 days later for bacteriology.

The gland level prevalence of IMI before drying-off was 27.2% (258/948). Pathogens isolated included coagulase negative staphylococci (59.3% of all IMI), Corynebacterium spp. (29.1%), Staphylococcus aureus (6.2%), Streptococcus agalactiae (4.3%) and other species (1.2%). Cure proportion increased following treatment (RR=2.98; P<0.01), was lower in >1- year-old compared to 1-year-olds (RR=0.87; P=0.07) and was lower for Staphylococcus aureus than other species (RR=0.54; P<0.01). Treatment reduced the likelihood of new IMI (RR=0.14, P<0.01). Older animals were more likely to acquire a new IMI than younger animals (RR=1.88 and RR=3.22 for 2 and >2-year-olds relative to 1-year-olds, respectively; P<0.01). Glands with an IMI at dry-off were less likely to acquire a new IMI than those uninfected (RR=0.16; P<0.01). Treatment reduced the log₁₀ SCC at the first herd production recording test in the subsequent lactation (2.21 vs. 2.49 (SED = 0.06) log₁₀ x 10³ SCC/ml for treated vs. control respectively, P<0.001).

It is concluded that infusion of antibiotics increased the bacteriological cure proportion, reduced the incidence of new infection over the non-lactating period and reduced SCC in dairy goats.

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Mastitis in dairy production

Current knowledge and future solutions

E-Book ISBN:: 9789086865505

Publisher:: Wageningen Academic

Print Publication Date:: 24 Oct 2005

Subjects
- Life Sciences

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Efficacy of antibiotic treatment at drying-off in curing existing infections and preventing new infections in dairy goats

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Mastitis in dairy production

Current knowledge and future solutions

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