Table 2.

Milk yield and chemical composition of milk obtained from the control and the experimental group

Items	Diet1)		p value
	CG	ZG
Animal parameters
Milk yield (kg/head/d)	40.15±1.56	39.73±1.71	ns
Chemical composition
Fat (%)	3.66±0.14	3.42±0.16	ns
Protein (%)	3.01±0.12	2.95±0.13	ns
Casein (%)	2.42±0.15	2.45±0.14	ns
Lactose (%)	4.77±0.19	4.80±0.18	ns
Urea (mg/100 mL)	22.78±0.79	23.04±0.72	ns
SCC (×103 cells/mL)	421±55	234±31	**
TBC (UFC/mL, ×103)	55±6	49±7	ns
pH	6.65±0.02	6.67±0.02	ns
Zinc (mg/kg)	3.59±0.23	4.22±0.21	*

SCC, somatic cell count; TBC, total bacterial count; ns, not significant.

¹⁾CG, control group; ZG, zinc group.

^*p<0.05,

^**p<0.01.