ABSTRACT
CARBOHYDRATE AND LIPID UTILIZATION IN MILK REPLACERS FOR CALVES

Marisol González Y.1 y Juan José Romero T.2
 

Curves of glycemia and lipemia were established before and after giving calves the experimental treatments in order to evaluate the absorbability of extruded rye as an energy source for calves. Twelve Holstein-Friesian talveswere used. Animals were included in the experiment after finishing the calostral period, when they were eight or nine days old. During the whole period, calves received apart from milk replacers, a high quality alfalfa hay and a calf starter. Animals were fasted for 6 hours previous to blood sampling. Calves were allotted at random to three of the following treatments: 1. Extruded rye at arate of 170 g in 2 lt of warm water in the morning feeding. The restof the required nutrients e.g. dried skimmilk, vitamins, minerals and antibiotics were provided in the PM feeding. 2. Commercial Replacer (Denkavit) was fed twice daily at arate of 250 g in 2 lt of warm water. 3. Milk at arate of 2 lt, fed twice daily.Curves were established from blood samples collected fram the jugular vein at 9-16-23-30-37 and 44 days of life, at -1, 0, 1, 2, 3 and 4 hours with respect to ingestion.
Only after 5 weeks of age, extruded rye behaves satisfactorily as an energy source for calves. Glycemia is a good indicator pattern ofnutrient absorption, being the best sampling hours the first, second and third hours postprandially. Lipemia is not a sensitive or specific pattern.

Keywords:
1Ing. Agr. Area Producción Animal, Estación Experimental La Platina, Instituto de Investigaciones Agropecuarias, Casilla 5427, Santiago, Chile.
2Ing. Agr. Ph. D. Area Producción Animal, Estación Experimental La Platina, Instituto de Investigaciones Agropecuarias, Casilla 5427, Santiago, Chile.