The objective of this experiment was to evaluate the effects of supplemental Cu and Se organic source on reproduction parameters, milk yield and composition in Normando dairy cattle. Multiparous Normando cows (n = 36), BW = 600 ± 32 kg were used from 30 d before calving until 120 d of lactation. Cows were blocked by expected calving date and randomly assigned to treatments. T0: without mineral supplementation, T1: inorganic mineral supplementation of Cu and Se, T2: organic mineral supplementation of Cu and Se. Sulphates were used as inorganic sources and B-traxim (Pancosma) and Selemax (Biorigin) as organic source of Cu and Se respectively. The mineral requirements were adjusted according to the NRC (2001). Cows were kept in a rotating pasture of Pennisetum clandestinum and supplemented during milking twice daily with treatments. Milk yield were recorded daily from 4 d until 120 d of lactation. Milk samples were taken for composition analysis of each cow every 30 d. Reproductive parameters were evaluated (Table 1). No differences were observed in the yield or composition of the milk (P > 0.05), However, there were significant differences with respect to open days and services per conception (P < 0.05) and a trend (P = 0.09) in the decrease of the days opened in T1 and T2. In conclusion, these data suggest that supplementation with organic and inorganic minerals did not influence on milk yield and composition. However, supplementation with organic minerals can improve the reproductive parameters in Normando dairy cows. Table 1. Effect of supplemental copper and selenium source on milk yield and composition and reproductive parameters in Normando dairy cattle

Item	Treatment1			SEM	P-value
T0	T1	T2
Milk yield, L/d	25.6	25.7	24.0	1.5	0.67
Protein, %	3.0	3.3	3.0	0.1	0.17
Fat, %	3.8	3.7	3.8	0.5	0.98
Total solids, %	12.8	13.1	11.1	0.7	0.17
SCC (1000/mL)	152.2	81.7	81.9	41.7	0.38
Days to first service	61.1	62.9	58.4	3.5	0.90
Open days	110.6	97.4	86.9	11.5	0.09
Services per conception	2.8a	2.6a	1.9b	0.4	0.01

¹T0 = without mineral supplementation, T1 = inorganic mineral supplementation of Cu and Se, T2 = organic mineral supplementation of Cu and Se.