Abstract

PEDROSO SOSA, Rodolfo  and  ROLLER GUTIERREZ, Felicia. Reproductive response to parenteral copper supplementation in anoestrous and cows with hypocupraemia. Rev. investig. vet. Perú [online]. 2024, vol.35, n.1, e25346.  Epub Feb 29, 2024. ISSN 1609-9117.  http://dx.doi.org/10.15381/rivep.v35i1.25346.

The study was carried out for six months in a herd of 5817 cows with hypocupraemia (<10.0 µmol/L copper in blood serum) in anoestrus. The animals were distributed into four groups: Group I (n=2984): Oestrus was induced with the application of progesterone and oestradiol benzoate following the administration scheme of progesterone in doses of 60, 90 and 90 mg via IM at 48 h intervals followed by 1 mg of oestradiol benzoate 48 hs later and inseminated at 48 and 56 h after treatment; Group II (n=1314), treated as Group I. but supplemented with a subcutaneous injection of copper (50 mg); Group III (n=1070), only received the copper supplement; Group IV: (n=449), control, without hormonal treatment or copper supplement. The groups supplemented with copper presented normal levels of the mineral at the end of the study, likewise, they presented pregnancy rates of 24.5% (Group II) and 37.4% (Group III), significantly higher than the rate of 19.5% in Group I and 19.0% in Group IV (p<0.05). It is concluded that copper supplementation in cows with hypocupraemia can contribute to reducing the percentage of anoestrus with and without the administration of hormonal therapy under the conditions of the study.

Keywords : copper; supplementation; reproduction.

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