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Effect of heat stress during late gestation on immune function and growth performance of calves: Isolation of altered colostral and calf factor

Extract: 

Maternal HT during late gestation decreased calf birth weight and weaning weight and compromised the passive IgG transfer, regardless of colostrum source. Feeding colostrum from HT cows during the dry period did not affect AEA or growth performance during the preweaning period, but seemed to impair humoral im- mune response during the first month of life.

Source: 

A. P. A. Monteiro, S. Tao, I. M. Thompson, and G. E. Dahl1
Department of Animal Sciences, University of Florida, Gainesville 32611

Heat-Treated (in single aliquot or batch) colostrum outperforms non-heat-treated colostrum in terms of quality and transfer of immunoglobulin G in neonatal Jersey calves

Extract: 

Heat-treating colostrum at 60°C for 60 min, using either the Perfect Udder bag or batch pasteurizer system, resulted in a significant reduction of colostrum bacterial counts while maintaining colostrum IgG concentrations compared with fresh frozen or fresh refrigerated colostrum. Calves fed heat-treated colostrum (PU or DTB) experienced significantly improved AEA and higher final serum IgG and STP measures at 24 h of age compared with calves fed fresh (FF or FR) colostrum.

Source: 

A.A. Kryzer,*1 S.M. Godden,* and R. Schell†

*Department of Veterinary Population Medicine, University of MInnesota, St. Paul 55108

†CalfStart, LLC, Altura, MN 55910

J. Dairy Sci. 98:1870-1877

http://dx.dor.org/10.3168/jds.2014-8387

 ©American Dairy Science Association®, 2015.