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Protein Required in Starters for Calves Fed Milk Once or Twice Daily¹

Department of Dairy and Poultry Science, Kansas State University, Manhattan 66506

ABSTRACT

Twenty-four 1-wk old Holstein calves were fed milk at 8% of body weight to a maximum of 4.1 kg daily until 5 wk of age and 2.3 kg daily during the next week in one or two equal feedings; then they were weaned. They could consume ad libitum calf starter containing either 13.0, 13.5, or 16.2% protein from 1 to 12 wk of age. Average daily gains (kg) from 1 to 6 wk and from 6 to 12 wk and kg feed/kg gain from 6 to 12 wk for calves fed once or twice daily were: .47, .53; .79, .77; 3.36, 3.25. Average daily gains (kg) from 1 to 6 wk and from 6 to 12 wk and kg feed/kg gain from 6 to 12 wk for calves fed 13.0, 13.5, or 16.2% protein starter were: .48, .52, .51; .76, .85, .74; 3.47, 3.20, 3.25. At 5 and 12 wk of age plasma protein concentrations of 18 of the calves (calculated as percent change from 1 wk of age) and plasma amino acid of 12 of the calves did not differ significantly due to treatment.

The results are discussed in light of current recommendations for protein and energy allowances for young calves.

¹ Contribution No. 862, Department of Dairy and Poultry Science, Kansas Agricultural Experiment Station, Manhattan.

² Present address: Department of Food Science and Institution Administration, University of Tennessee, Knoxville 37900.