Table 6. Proportion of pigs (based on pen averages) with tail damage (score > 1) and ear damage (score > 1) observed for each treatment group: low and high sanitary condition pigs both with diets containing either low or normal protein levels and basal or supplemented amino acid profiles.

	LSC1				HSC1
	LP2		NP2		LP		NP		P-values4
Damage score5	AA-B3	AA-S3	AA-B	AA-S	AA-B	AA-S	AA-B	AA-S	SC	CP	AA	batch	SC×AA	SC×CP
n6	8	8	8	8	8	8	8	8
Tail
starter	0.80 ± 0.08	0.82 ± 0.04	0.76 ± 0.04	0.83 ± 0.08	0.64 ± 0.06	0.65 ± 0.06	0.78 ± 0.07	0.54 ± 0.04	< .0001	0.98	0.45	0.002	0.06	0.70
grower	0.83 ± 0.07	0.75 ± 0.09	0.78 ± 0.08	0.88 ± 0.06	0.95 ± 0.03	0.94 ± 0.02	0.94 ± 0.04	0.85 ± 0.06	< .0001	0.76	0.52	0.47	0.37	0.21
finisher	0.92 ± 0.03	0.91 ± 0.04	0.93 ± 0.03	0.91 x 0.04	0.95 ± 0.03	0.88 ± 0.03	0.81 ± 0.06	0.84 ± 0.04	0.68	0.07	0.54	< .0001	0.88	0.04
Ear
starter	0.52 ± 0.05	0.41 ± 0.08	0.30 ± 0.07	0.45 ± 0.06	0.47 ± 0.12	0.36 ± 0.08	0.43 ± 0.06	0.28 ± 0.06	0.50	0.13	0.30	0.02	0.17	0.78
grower	0.34 ± 0.12	0.32 ± 0.06	0.37 ± 0.05	0.31 ± 0.07	0.42 ± 0.10	0.20 ± 0.05	0.34 ± 0.08	0.16 ± 0.05	0.10	0.63	0.02	0.86	0.11	0.53
finisher	0.53 ± 0.08	0.40 ± 0.06	0.51 ± 0.10	0.45 ± 0.09	0.31 ± 0.12	0.29 ± 0.05	0.32 ± 0.07	0.35 ± 0.12	< .0001	0.62	0.32	0.76	0.31	0.90

¹LSC = low sanitary conditions, HSC = high sanitary conditions.

²LP = low crude protein level in diet, NP = normal crude protein level in diet.

³AA-B = basal dietary amino acid profile, AA-S = supplemented dietary amino acid profile containing 20% more Met, Thr, and Trp than the basal profile.

⁴ Significant P-values are indicated in bold and for a tendency values are underlined. Means are presented as raw means ± standard error of the mean.

⁵Damage scores were either 0 = no damage or 1 = damage and were averaged per pen.

⁶n = number of pens, a pen contained nine pigs.