Table 13.

Effects of dietary valine and isoleucine concentrations on significant responses in feed intakes of laying hens.

Basis	Reference	Age (weeks)	Breed	Valine (g/kg)	Dietary energy (MJ/kg)	Response (g/bird/d)
Total	Harms and Russell (2001)	39-	Hy-Line W36	5.3 vs. 7.0	12.22 vs. 11.88	81 vs. 96
	Azzam et al. (2015)	40-47	Hy-Line brown	9.0 vs. 11.0	11.31	115 vs. 110
	Wen et al. (2019b)	41-60	Hy-Line W36	5.2 vs. 7.3	12.46	67 vs. 93
Digestible	Lelis et al. (2014)	42-54	Dekalb Brown	5.6 vs. 6.6	12.35	NS
	Bregendahl et al. (2008)	28-34	Hy-Line W36	4.7 vs. 8.8	12.51	54 vs. 87

Basis	Reference	Age (weeks)	Breed	Isoleucine (g/kg)	Dietary energy (MJ/kg)	Response (g/bird/day)
Total	Harms and Russell (2000a)	32-38	Hy-Line W36	4.9 vs. 6.7	12.09 vs. 11.70	NS
	Peganova and Eder (2002)	28-33	Lohmann brown	6.9 vs. 8.1	11.44	102 vs. 87
	Peganova and Eder (2002)	24-33	Lohmann brown	4.3 vs. 10.5	11.44	117 vs. 88
	Peganov, and Eder (2002)	46-54	Lohmann brown	5.1 vs. 10.5	11.44	115 vs. 97
	Shivazad et al. (2002)	37-43	Hy-Line W36	3.9 vs. 5.7	12.31 vs. 11.99	70 vs. 91
	Rocha et al. (2013a)	24-40	Hy-Line W36	5.9 vs. 8.0	12.20	NS
	Dong et al. (2016)	29-40	Lohmann brown	5.4 vs. 9.4	11.26	NS
	Parenteau et al. (2020)	20-27	White Shaver	6.0 vs. 7.5	11.72	NS
	Parenteau et al. (2020)	20-27	White Shaver	5.7 vs. 6.4	11.72	116 vs. 110
Digestible	Bregendahl et al. (2008)	28-34	Hy-Line W36	3.7 vs. 6.4	12.51	56 vs. 85

Abbreviation: NS, nonsignificant.