SciELO - Scientific Electronic Library Online

vol.52 issue5Evaluation of subfertility in dairy cows by measuring the pelvis and the genital tractRisk factors associated with the reproductive performance in sows author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Arquivo Brasileiro de Medicina Veterinária e Zootecnia

Print version ISSN 0102-0935On-line version ISSN 1678-4162


MATTOS, P.S.R.; FRANZOLIN, R.  and  NONAKA, K.O.. Plasma melatonin in bufallo heifers (Bubalus bubalis) during a year. Arq. Bras. Med. Vet. Zootec. [online]. 2000, vol.52, n.5, pp.475-478. ISSN 0102-0935.

Nine blood samples were taken to determine plasma melatonin in a 24h-period/month for a year. The six buffalo heifers used were kept at latitude 22° South. Plasma melatonin rose slowly, peaking at night (between 9 and 11pm) and maintained until 3 to 5am. Melatonin concentration decreased day-time to lower levels until sunrise. Nocturnal higher plasmatic melatonin did not vary with night length over the year. Diurnal melatonin concentrations were lower when estimated reproductive rate was the highest for the herd.

Keywords : Buffalo; melatonin; seasonality.

        · abstract in Portuguese     · text in Portuguese


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License