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Table 2 Growth variables, faecal and urine nitrogen content in rats fed a diet containing casein, ESM-protein or ESM-hydrolysate

From: Eggshell membrane protein can be absorbed and utilised in the bodies of rats

  Casein ESM-protein ESM-hydrolysate
Initial body weight (g) 277 ± 3 277 ± 3 277 ± 3
Final body weight (g) 305 ± 2a 286 ± 6b 296 ± 2ab
Body weight gain (g/day) 2.76 ± 0.22a 0.868 ± 0.468b 1.87 ± 2.4ab
Food consumption (g/day) 19.9 ± 0.0 20.0 ± 0.4 20.1 ± 0.7
Food efficiency* 0.136 ± 0.011a 0.0421 ± 0.0236b 0.0982 ± 0.0177ab
Faecal weight (dry g/5 days) 8.57 ± 0.08 9.90 ± 0.73 9.09 ± 0.40
Urine volume (mL/5 days) 62.8 ± 13.0a 26.3 ± 8.4b 61.1 ± 3.5a
Faecal nitrogen (mg/5 days) 40.8 ± 0.9a 226 ± 17b 101 ± 5c
Urine nitrogen (mg/5 days) 397 ± 12a 65.0 ± 10.6b 187 ± 12c
  1. Mean ± standard error (SE) of six rats. Superscript letters indicate a significant difference (Tukey’s test, p < 0.05)
  2. ESM egg shell membrane
  3. * Food efficiency: body weight gain (g/day)/food consumption (g/day)