2020
DOI: 10.3168/jds.2019-17955
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Consensus recommendations on calf- and herd-level passive immunity in dairy calves in the United States

Abstract: Passive immunity in calves is evaluated or quantified by measuring serum or plasma IgG or serum total protein within the first 7 d of age. While these measurements inform about circulating concentrations of this important protein, they are also a proxy for evaluating all of the additional benefits of colostral ingestion. The current individual calf standard for categorizing dairy calves with successful passive transfer or failure of passive transfer of immunity are based on serum IgG concentrations of ≥10 and … Show more

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Cited by 192 publications
(193 citation statements)
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References 27 publications
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“…Even in dairy calves, no agreement on the most appropriate STP thresholds has been reached, with recently suggested optimal thresholds ranging from 5.1 to 5.8 g/L. 9,[26][27][28][29][30] We acknowledge the limited usefulness of our proposed thresholds for detection of IgG <10 g/L in populations similar to ours. As shown in 31,32 , and also reflects the generally high average colostral IgG concentration in western Canadian beef cows.…”
Section: Discussionmentioning
confidence: 62%
“…Even in dairy calves, no agreement on the most appropriate STP thresholds has been reached, with recently suggested optimal thresholds ranging from 5.1 to 5.8 g/L. 9,[26][27][28][29][30] We acknowledge the limited usefulness of our proposed thresholds for detection of IgG <10 g/L in populations similar to ours. As shown in 31,32 , and also reflects the generally high average colostral IgG concentration in western Canadian beef cows.…”
Section: Discussionmentioning
confidence: 62%
“…Thus, calves that received 15% or 20% BW of colostrum had higher concentrations of IgG, both at the beginning and during the cold challenge. If the more recent recommendation of the TSP cut point is applied [4], we could consider the PIT to be excellent since all calves present TSP > 6.2 g/dL. That was unexpected since feeding only 10% of BW as colostrum to the newborn could increase the proportion of calves with lower PST concentrations.…”
Section: Discussionmentioning
confidence: 99%
“…According to Osaka et al [2], the apparent efficiency of absorption (AEA) of IgG declines by less than 0.3%/h from calving to 12 h after birth and 2.5%/h from 12 to at least 18 h after birth. Feeding calves with higher volumes of colostrum during the first hours of life promotes optimum growth, reduces veterinarian and medical costs, and increases future milk production [3][4][5].…”
Section: Introductionmentioning
confidence: 99%
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“…Median P2 weights tended to be lower for calves at E1 classified as sick relative to healthy calves although there was considerable overlap in the range of weights within the IQR. Median TSP values across the groups ranged from 5.9 to 6.3 g/dl and would be classified as good to excellent based on recent published recommendations (25). We used the farm level TSP distribution to create categories for subsequent analyses.…”
Section: Enrollment Datamentioning
confidence: 99%