Resumen

ORMAECHEA, Sebastián; ESCRIBANO, Cecilias; PIGHIN, D.  y  PERI, P.. Suplementación proteica posinvernal en sistemas bovinos extensivos de Tierra del Fuego. RIA. Rev. investig. agropecu. [online]. 2019, vol.45, n.3, pp.344-353. ISSN 1669-2314.

Livestock production in the central zone of Tierra del Fuego province is mainly carried out based on meadows and understory forage. Both, the forage production seasonality and harsh climate, entail challenges for an adequate cattle management that guarantee a profitable production. In this context, management options that minimize climate risks and reduce labor costs are needed to sustain productivity. Therefore, the objective of the present study was to compare over 2 years a management that incorporate late winter protein supplementation against a control treatment that represents the traditional management. Supplementation consisted of a 500 g/animal daily delivery of nutritional supplement (30% protein) at the end of the winter. On both treatments, were measured live weight gain/loss, docility (roundup time, heart rate and blood levels of cortisol, lactate and glycemia, and creatine kinase enzyme activity) and parasite load. Quantity and quality of available forage, and quality of water for animal consumption were also assessed. The productive results depended on the climatic rigor of the year, with supplementation being convenient only when the animals were losing live weight. On the other hand, the tameness of cattle was evident under the supplemented handling in both seasons given the reduction of roundup times without effect on physiological tameness indicators.

Palabras clave : livestock production.