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Effects of intramammary infection and parity on calf weaning weight and milk quality in beef cows

(2000) JOURNAL OF ANIMAL SCIENCE. 78(10). p.2508-2514
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Abstract
The objectives of this study were to determine 1) the effect of intramammary infection on calf weaning weight, milk somatic cell count, and milk composition, and 2) the effect of parity on percentages of infected cows, infected quarters, and blind quarters. The number of infected quarters, milk somatic cell counts, milk components, and intramammary infection were studied at weaning in 164 beef cows. The percentage of infected cows ranged from 61.9% at first parity to 66.7% at fifth to ninth parities. Cows with three or four infected quarters had higher (P < .01) milk somatic cell counts than cows with zero, one, or two infected quarters. Among bacterial isolates, Staphylococcus aureus-infected quarters had the highest (P < .01) milk somatic cell count. Percentages of butterfat and lactose were lower (P < .01) in milk from infected quarters than from uninfected quarters. Infections by S. aureus and coagulase-negative staphylococci were the most common and accounted for 67 to 78% of the infections. Percentages of infected quarters and infections caused by S. aureus increased with parity (P < .01). Intramammary infections did not affect (P > .10) calf weaning weight. In conclusion, intramammary infection had no effect on calf weaning weight but increased milk somatic cell count and decreased the percentage of protein, lactose, solids-not-fat, and butterfat. The number of infected and blind mammary quarters increased with parity.
Keywords
infection, cows, mastitis, somatic cell counts, STAPHYLOCOCCUS-AUREUS, SUBCLINICAL MASTITIS, PREVALENCE, CALVES

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MLA
Paape, Max et al. “Effects of Intramammary Infection and Parity on Calf Weaning Weight and Milk Quality in Beef Cows.” JOURNAL OF ANIMAL SCIENCE 78.10 (2000): 2508–2514. Print.
APA
Paape, M., Dueñas, M., Wettemann, R., & Douglass, L. (2000). Effects of intramammary infection and parity on calf weaning weight and milk quality in beef cows. JOURNAL OF ANIMAL SCIENCE, 78(10), 2508–2514.
Chicago author-date
Paape, Max, MI Dueñas, RP Wettemann, and LW Douglass. 2000. “Effects of Intramammary Infection and Parity on Calf Weaning Weight and Milk Quality in Beef Cows.” Journal of Animal Science 78 (10): 2508–2514.
Chicago author-date (all authors)
Paape, Max, MI Dueñas, RP Wettemann, and LW Douglass. 2000. “Effects of Intramammary Infection and Parity on Calf Weaning Weight and Milk Quality in Beef Cows.” Journal of Animal Science 78 (10): 2508–2514.
Vancouver
1.
Paape M, Dueñas M, Wettemann R, Douglass L. Effects of intramammary infection and parity on calf weaning weight and milk quality in beef cows. JOURNAL OF ANIMAL SCIENCE. 2000;78(10):2508–14.
IEEE
[1]
M. Paape, M. Dueñas, R. Wettemann, and L. Douglass, “Effects of intramammary infection and parity on calf weaning weight and milk quality in beef cows,” JOURNAL OF ANIMAL SCIENCE, vol. 78, no. 10, pp. 2508–2514, 2000.
@article{820832,
  abstract     = {The objectives of this study were to determine 1) the effect of intramammary infection on calf weaning weight, milk somatic cell count, and milk composition, and 2) the effect of parity on percentages of infected cows, infected quarters, and blind quarters. The number of infected quarters, milk somatic cell counts, milk components, and intramammary infection were studied at weaning in 164 beef cows. The percentage of infected cows ranged from 61.9% at first parity to 66.7% at fifth to ninth parities. Cows with three or four infected quarters had higher (P < .01) milk somatic cell counts than cows with zero, one, or two infected quarters. Among bacterial isolates, Staphylococcus aureus-infected quarters had the highest (P < .01) milk somatic cell count. Percentages of butterfat and lactose were lower (P < .01) in milk from infected quarters than from uninfected quarters. Infections by S. aureus and coagulase-negative staphylococci were the most common and accounted for 67 to 78% of the infections. Percentages of infected quarters and infections caused by S. aureus increased with parity (P < .01). Intramammary infections did not affect (P > .10) calf weaning weight. In conclusion, intramammary infection had no effect on calf weaning weight but increased milk somatic cell count and decreased the percentage of protein, lactose, solids-not-fat, and butterfat. The number of infected and blind mammary quarters increased with parity.},
  author       = {Paape, Max and Dueñas, MI and Wettemann, RP and Douglass, LW},
  issn         = {0021-8812},
  journal      = {JOURNAL OF ANIMAL SCIENCE},
  keywords     = {infection,cows,mastitis,somatic cell counts,STAPHYLOCOCCUS-AUREUS,SUBCLINICAL MASTITIS,PREVALENCE,CALVES},
  language     = {eng},
  number       = {10},
  pages        = {2508--2514},
  title        = {Effects of intramammary infection and parity on calf weaning weight and milk quality in beef cows},
  url          = {http://jas.fass.org/cgi/content/abstract/78/10/2508},
  volume       = {78},
  year         = {2000},
}

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