Development metabolic partitioning of energy in young calves
| Autor: | W. van der Hel, A. Arieli, Johan W. Schrama, M.W.A. Verstegen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1995 |
| Předmět: |
Male
Animal Nutrition HE Energy balance LE adaptation Hemoglobins metabolizable energy Veehouderij Animal Husbandry Temperature Adaptation Physiological Diervoeding newborn calves ME requirements for maintenance Digestion Energy source Body Temperature Regulation energy medicine.medical_specialty Nitrogen Animal feed pBMR MEm high energy diet Calorimetry Biology Animal science Internal medicine Genetics medicine Animals predicted basal metabolic rate ME Calorimetry Indirect Metabolism Animal Feed Kinetics Endocrinology low energy diet Immunoglobulin G Basal metabolic rate WIAS Cattle Animal Science and Zoology Basal Metabolism Hemoglobin Energy Intake Energy Metabolism metabolism Food Science |
| Zdroj: | Journal of Dairy Science 78 (1995) Journal of Dairy Science, 78, 1154-1162 |
| ISSN: | 0022-0302 |
| DOI: | 10.3168/jds.s0022-0302(95)76732-7 |
| Popis: | Modifications in thermal demand and energy partitioning in newborn calves were determined over time via indirect calorimetry. One-week-old calves were fed milk replacer at 70 and 110% of the metabolizable energy requirements for maintenance, at ambient temperatures of 7.5 or 19 degrees C, over two consecutive but separately monitored 7-d balance periods. During wk 1, N digestibility, energy digestibility, and energy metabolizability were lower than during wk 2. Heat production decreased, but retention of energy and fat increased, between balance periods. During wk 1, initial IgG concentration in serum was positively correlated with digestibilities of N and energy, and hemoglobin concentration was negatively correlated with heat production. Regression analysis revealed that predicted basal metabolic rate, efficiency of metabolizable energy use, and metabolizable energy requirements for maintenance were lower for wk 2 than for wk 1. Decreased energy utilization in calves on restricted feedings is related to an increase in the utilization of protein as an energy source. Young calves need at least 2 wk to adapt to the combination of new environmental temperature and low feeding amount. Metabolic partitioning of energy may indicate completion of the adaptation stage. |
| Databáze: | OpenAIRE |
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