Feeding heat-treated colostrum to neonatal dairy heifers: Effects on growth characteristics and blood parameters
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| Autores: | , |
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| Formato: | artículo original |
| Fecha de Publicación: | 2009 |
| Descripción: | 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. |
| País: | Kérwá |
| Institución: | Universidad de Costa Rica |
| Repositorio: | Kérwá |
| Lenguaje: | Inglés |
| OAI Identifier: | oai:https://www.kerwa.ucr.ac.cr:10669/87250 |
| Acceso en línea: | https://www.sciencedirect.com/science/article/pii/S0022030209706435?via%3Dihub https://hdl.handle.net/10669/87250 |
| Access Level: | acceso abierto |
| Palabra clave: | Colostrum Heat treatment Blood immunoglobulin G HEALTH CATTLE |