Use of zinc oxide nanoparticles in the growing rabbit diets to mitigate hot environmental conditions for sustainable production and improved meat quality

Table 3 Effects of ZnO-NPs on carcass criteria of growing rabbits

Items (%)	ZnO-NPs levels, mg/kg					SEM	P-value
Items (%)	0	20	40	60	80	SEM	Lin.	Quad.
Carcass%	60.60^b	63.40^a	64.02^a	65.03^a	64.07^a	2.200	0.001	0.041
Fore%	38.42^a	35.83^b	34.66^b	33.85^b	36.32^b	1.133	0.001	0.006
Loin%	22.01	23.42	22.51	22.86	22.33	2.302	0.055	0.056
Hind%	40.13^b	41.25^ab	42.64^a	43.84^a	42.73^a	1.015	0.002	0.041
Fat%	3.882^a	2.725^b	1.980^c	1.822^c	1.881^c	0.621	0.001	0.001
Liver%	3.671	3.472	3.462	3.592	3.413	0.821	0.067	0.131
Heart%	0.772	0.782	0.767	0.788	0.774	0.542	0.412	0.808
Spleen%	0.142	0.139	0.153	0.143	0.138	0.134	0.797	0.679
Kidneys%	0.138	0.133	0.135	0.134	0.133	0.292	0.712	0.878
Head%	6.622	6.578	6.631	6.463	6.773	0.121	0.810	0.081
Testes%	1.412^b	1.689^a	1.752^a	1.947^a	0.767	0.127	0.008	0.024

^a-c Means (n = 25) not sharing a common superscript in a row are significantly different (P < 0.05).(n = 25). SEM standard error of means, Lin and Quad linear and quadratic responses, respectively, to supplementation levels of ZnO-NPs