Incidence of Intramammary Infections and Effects of Number of Lactations, Lactation Stage, Quarter and Calf Sex on Somatic Cell Content of Milk from Angus-Holstein F1 Cows

Wilson, L. L.; Eberhart, R. J.; Simpson, M. J. A.; Varela-Alvarez, H.; Rugh, M. C.; Bair, L. G.

doi:10.2527/jas1971.332433x

Cited by 10 publications

(19 citation statements)

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“…This agrees with Newman et al (1991) who found that uninfected quarters of beef cows had SCC of about 20 × 10 3 cells/mL. Wilson et al (1971) observed that although mastitis causing bacteria may be present in beef cows, SCC usually were not elevated to an abnormal concentration.…”

Section: Discussionsupporting

confidence: 88%

“…The use of the CMT for beef production has been limited. Factors that influenced CMT scores in beef herds have been reported (Wilson et al, 1971); however, SCC associated with CMT scores were not included. Newman et al (1991) SCC were not reported.…”

Section: Discussionmentioning

confidence: 99%

“…In our experiment, CMT scores of 2 and 3 for quarters without infection probably resulted from stage of lactation that samples were taken. Somatic cell counts are usually greatest during early and late lactation in dairy (Bodoh et al, 1976;Reneau, 1986) and beef cows (Wilson et al, 1971;Hunter and Jeffrey, 1975;Newman et al, 1991), and SCC may be elevated for up to 2 wk after parturition (Cullen, 1968;Natzke et al, 1972). We sampled at 8 to 14 d postpartum to evaluate CMT, whereas Newman et al (1991) took samples for CMT at 4 wk postpartum.…”

Section: Discussionmentioning

confidence: 99%

“…Bacteria were passed four times on esculin blood agar plates, and a second coagulase test was performed before Api Staph wells were inoculated. Streptococcal isolates were identified using CAMP-esculin plates (Wilson et al, 1971), made in accordance with standard procedures (NMC, 1987). Corynebacterium bovis and Bacillus spp.…”

Section: Bacteriological Analysesmentioning

confidence: 99%

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Efficacy of intramuscular treatment of beef cows with oxytetracycline to reduce mastitis and to increase calf growth2

Lents

Wettemann

Paape

et al. 2002

Journal of Animal Science

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Spring-calving multiparous Angus x Hereford cows were used to determine the efficacy of intramuscular treatment with oxytetracycline to reduce the incidence of mastitis-causing bacteria, decrease milk somatic cell counts (SCC), and increase calf growth. During 2 yr, milk samples were collected from each quarter from a total of 319 cows at 8 to 14 d after calving and at weaning, to determine the presence of bacteria and SCC. A California mastitis test (CMT) was performed on milk from each quarter of each cow at the initial sample collection. Cows with a CMT score of 1, 2, or 3 in at least one quarter, were randomly assigned to receive either an intramuscular injection of oxytetracycline (n = 63) or the control vehicle (n = 60), and cows with a CMT score of 0 or trace in all four quarters were not treated (n = 196). Calf weights were determined at birth, early lactation, and weaning. The number of somatic cells in milk and the percentage of quarters that were infected increased as CMT score increased (P < 0.01). The presence of mastitis-causing bacteria at calving increased (P < 0.05) the incidence of infection at weaning. The presence of mastitis-causing bacteria at weaning was associated with increased SCC for quarters and average SCC for cows (P < 0.01). Average SCC per cow at weaning increased (P < 0.05) as the number of infected quarters per cow increased. Treatment did not alter (P > 0.10) the percentage of cows or quarters infected with mastitis-causing bacteria or SCC of cows or quarters at weaning. Average SCC per cow was negatively correlated (P < 0.05) with calf weights at early lactation, but not with weaning weights of calves. Treatment did not influence (P > 0.10) calf weights at early lactation or at weaning. Cows with one or more dry quarters after calving had calves that weighed less at early lactation and weaning than cows with four functional quarters (P < 0.01). Intramuscular oxytetracycline treatment of beef cows that had CMT scores of 1 or greater after calving did not reduce intramammary infection rates or increase calf weights at weaning.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Bacteriological Analysesmentioning

confidence: 99%

See 2 more Smart Citations

Efficacy of intramuscular treatment of beef cows with oxytetracycline to reduce mastitis and to increase calf growth2

Lents

Wettemann

Paape

et al. 2002

Journal of Animal Science

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“…Other factors such as cross-suckling (Newman et al, 1991), forage availability (Neville, 1962;Day et al, 1987), breed, genetic differences, and mammary health may have influenced calf weaning weight. For example, the number of lactations ranging from 1 to 5 in first-genera- tion (F 1 ) beef-dairy cows did not influence calf 205-d weaning weight (Wilson et al, 1971).…”

Section: Calf Weightmentioning

confidence: 98%

Incidence of mastitis in beef cows after intramuscular administration of oxytetracycline.

Duenas

Paape²,

Wettemann

et al. 2001

Journal of Animal Science

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There is limited information on the value of antibiotic therapy for mastitis in beef cows. Effects of antibiotic treatment at weaning and the subsequent calving on calf weaning weight, milk somatic cell counts, milk components, and intramammary infection were studied in beef cows. Additionally, effects of number of infected mammary quarters, number of dry mammary quarters, type of intramammary pathogen, and parity on response variables were determined. Cows (n = 192) were randomly assigned to treatments in a 2 x 2 factorial arrangement; factors were time of treatment (weaning and after calving) and treatment (vehicle and vehicle plus antibiotic). Oxytetracycline (LA-200) or vehicle was administered intramuscularly following collection of quarter milk samples at weaning and calving. Percentage of infected cows and quarters averaged 43.4 and 16.4%, respectively, at calving and increased (P < 0.05) to 53.7 and 29.7% at weaning. Calves from cows with one or two dry quarters weighed 12.7 kg less (P < 0.05) at 90 d after calving and 18.7% less (P < 0.05) at 212 d after calving than calves from cows with no dry quarters. Calves from cows with three or four infected quarters weighed 17.5 kg less (P < 0.05) at 90 d and 25.5 kg less (P < 0.05) at weaning than calves from cows with two or fewer infected quarters. Infections by Staphylococcus aureus and coagulase-negative staphylococci were the most common and accounted for 67 and 78% of the infections. Percentages of infected cows and quarters, infections caused by S. aureus, and dry quarters increased (P < 0.05) with parity. No differences were found among antibiotic treatments for any of the response variables studied. Intramuscular oxytetracycline was not effective in the control of mastitis in beef cows under the conditions of the study.

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The effects of dose and duration of administration of pFSH during the first follicular wave on the ovulation rate of beef heifers

1998

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Incidence of Intramammary Infections and Effects of Number of Lactations, Lactation Stage, Quarter and Calf Sex on Somatic Cell Content of Milk from Angus-Holstein F1 Cows

Cited by 10 publications

References 0 publications

Efficacy of intramuscular treatment of beef cows with oxytetracycline to reduce mastitis and to increase calf growth2

Efficacy of intramuscular treatment of beef cows with oxytetracycline to reduce mastitis and to increase calf growth2

Incidence of mastitis in beef cows after intramuscular administration of oxytetracycline.

The effects of dose and duration of administration of pFSH during the first follicular wave on the ovulation rate of beef heifers

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