Resumo

MELENDEZ, P; PALOMARES, R  e  BARRAZA-RODRIGUEZ, JE. Effects of copper, zinc, selenium and manganese parenteral supplementation on reproductive performance of Holstein cows. Cienc. vet. [online]. 2021, vol.23, n.2, pp.4-4. ISSN 1515-1883.  http://dx.doi.org/https://doi.org/10.19137/cienvet202123204.

The objective of this investigation was to study the supplementa- tion of injectable trace minerals (ITM), based on Cu, Zn, Mn, and Se on reproductive performance of dairy cows from Torreon, Mexico, a geographical region characterized by a semi-desertic climate. The study consisted of 2 field trials. Trial 1 compared the application of 2 doses of ITM during the dry period (at dry-off and at prepartum) (n= 75) with a control group (n=79). Trial 2 compared the application of 1 dose of ITM at 35 d postpartum (n=258) with a control group (n=258). In both trials, conception rate at first service (CRFS) and days to conception were evaluated. In Trial 1, CRFS was not different be- tween groups, but calving to conception interval tended to be shorter in 10 days in the treated than the control group (P=0.14). In trial 2, CRFS was not different between groups either, but time to pregnancy was significantly 14 days earlier than the control group (P ≤ 0.05). It is concluded that although CRFS was similar between groups, the appli- cation of an ITM reduced the time to pregnancy in treated than the control groups, which have a great impact on herd’s fertility and profit.

Palavras-chave : Copper; Zinc; Selenium; Manganese; Fertility; Days.

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