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. 2021 Jul 24;100(10):101398. doi: 10.1016/j.psj.2021.101398

Table 3.

Effect of dietary AA levels on embryo mortality of Cobb 500 SF broiler breeders.1

Stage ED2 Breeder age, wk Low-AA Moderate-AA Standard-AA High-AA SEM P-value
(%)
Early term 1–7 34 4.44 5.77 3.95 3.66 0.96 0.447
Middle term 7–18 34 2.59 3.80 2.41 2.40 0.80 0.568
Late term 18–21 34 0.85 1.40 0.71 1.26 0.25 0.212
Early dead 24h 29 3.00a 1.28b 1.87ab 2.57a 0.36 0.025
Blood ring 3 37 0.63b 0.40b 0.56b 1.41a 0.19 0.037
Malpositions 14–20 46 1.65b 2.74a 1.22b 1.29b 0.33 0.041
Internal pipping 19–20 53 0.58c 1.01b 0.57c 2.32a 0.42 0.040
External pipping 20–21 33 0.72a 1.00a 0.14b 0.28b 0.19 0.027
a-c

Means in columns followed by different superscript letters are statistically different by Tukey's HSD test (P < 0.05).

1

Low-AA, moderate-AA, standard-AA, high-AA diets corresponding to 80, 90, 100, and 110% of the Cobb-Vantress (2018) recommendations, guided by dig Lys using balanced protein. n = 4 pens with 1 or 2 trays of 180 eggs per breeder pen.

2

Abbreviation: ED, embryonic day.