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Effect of protein on growth of Holstein heifer calves from 2 to 10 months.

Two trials involving 44 weaned Holstein heifer calves were to determine effects of protein on growth in weight and wither height, dry matter intake, and digestibility. In trial 1, 24 calves were fed according to requirements from 85 to 182 d of age, then at 80, 100, or 120% of recommended amounts for dietary protein content until 295 d. Weight at 295 d increased linearly with protein (280, 287, 298 kg), but wither height and dry matter intake were unaffected. In trial 2, 20 calves were fed 80, 100, or 120% of recommended protein from 71 to 182 d. Weight and wither height at 182 d responded quadratically to protein with highest values from the medium protein diet. From 183 to 295 d, trial 2 calves were rerandomized to diets of medium or high protein. Weight at 295 d was increased by high protein. An interaction between treatments for wither height indicated responses to high protein after 182 d for calves on low or medium protein before that time and a decrease for calves on high protein throughout. In male calves of similar age, elevated protein increased apparent protein digestibility but had inconsistent effects on digestibility of dry matter. Current protein recommendations appear adequate for calves to 6 mo of age but thereafter may be too generous.