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Table 3 Effects of dietary betaine (Bet), vitamin C (Vit. C), vitamin E (Vit. E), and their combined supplementation on digestibility of nutrients in dual-purpose hens reared under heat stress condition

From: Laying performance, digestibility and plasma hormones in laying hens exposed to chronic heat stress as affected by betaine, vitamin C, and/or vitamin E supplementation

Digestibility, % Control (+) Heat stress treatments SEM P value
Control (−) Control + Bet Control +Vit. C Control +Vit. E Control + Bet + Vit. C Control + Bet + Vit. E Control + Vit. C + Vit. E Control + Bet + Vit. C + Vit. E
Dry matter 69.12 68.60 69.44 69.03 69.18 69.42 69.35 68.97 69.33 0.371 0.791
Crude protein 79.60a 76.41c 78.93ab 78.75ab 78.22b 79.13ab 78.97ab 78.95ab 79.17ab 0.271 0.001
Ether extract 78.24 77.93 78.41 78.11 78.09 78.33 78.36 78.21 78.49 0.402 0.991
Crude fiber 24.12 23.99 24.16 23.95 24.00 24.14 24.17 24.06 24.15 0.310 0.999
Nitrogen free extract 79.34 79.23 79.45 79.32 79.40 79.56 79.50 79.52 79.42 0.355 0.999
  1. Means with at least one common superscript in a row do not differ significantly (P > 0.05)