Feeding heat-treated colostrum to neonatal dairy heifers: Effects on growth characteristics and blood parameters
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2009Autor
Elizondo Salazar, Jorge Alberto
Heinrichs, Arlyn Jud
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Newborn Holstein heifer calves were studied to compare absorption of immunoglobulin G (IgG1 and IgG2),
total serum protein concentration, lymphocyte counts,
health scores, growth, and starter intake after receiving unheated or heat-treated colostrum. First-milking
colostrum was collected from Holstein cows and frozen
at −20°C to accumulate a large batch. After thawing
and mixing, half of the colostrum was transferred into
1.89-L plastic containers and frozen at −20°C until
needed for feeding. The remaining half was heated at
60°C for 30 min, transferred into 1.89-L plastic containers, and then frozen at −20°C until needed for feeding. Forty heifer calves weighing ≥32 kg at birth were
enrolled into 1 of 2 treatment groups before suckling
occurred. For the first feeding, 3.8 L of colostrum was
bottle fed by 1.5 to 2 h of age. For the second and third
feedings, pasteurized whole milk at 5% of birth body
weight (BW) was fed. Subsequently, calves received
milk replacer containing 20% crude protein and 20%
fat at 10% of birth BW/d until wk 5. Milk replacer
was reduced to 1 feeding of 5% birth BW until weaning
at 6 wk of age. Blood samples and growth data were
collected through wk 8. Batch heat-treatment of colostrum at 60°C for 30 min lowered colostrum bacteria
concentration while maintaining colostral IgG concentration and viscosity. Calves fed heat-treated colostrum
had significantly greater IgG concentrations at 24 h
and greater apparent efficiency of IgG absorption (IgG
= 23.4 g/L; apparent efficiency of absorption = 33.2%)
compared with calves fed unheated colostrum (IgG =
19.6 g/L; apparent efficiency of absorption = 27.7%).
There was no difference between treatment groups in
growth measurements, calf starter intake, lymphocyte
counts, or health scores.
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10.3168/jds.2008-1667Colecciones
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