Resumo

JAIMES CRUZ, Ligia Johana  e  CORREA CARDONA, Héctor Jairo. Balance de nitrógeno, fósforo y potasio en vacas Holstein pastando praderas de kikuyo (Cenchrus clandestinus) en el norte de Antioquia. Ces. Med. Vet. Zootec. [online]. 2016, vol.11, n.2, pp.18-41. ISSN 1900-9607.

Abstract To aim to estimate the balance of nitrogen (N), phosphorus (P) and potassium (K) in Holstein cows in northern Antioquia in the three thirds of lactation and in two seasons (high and low precipitation) grazing kikuyo grass (Cenchrus clandestinus), nine cows (three by lactation third) of five herds to which they estimated forage intake, consumption of food supplements and mineralized salt, were selected and were estimated excretion of feces, urine and milk secretion during last three days of an experimental period of 14 days in every season. Food samples, feces, urine and milk were taken in which the content of N, P and K were determined and digestibility, balance and efficiency of each nutrient in milk production were calculated. Data were analyzed under a completely randomized design in a factorial arrangement 3x2. With the advancement of lactation the efficiency of N, P and K decreased (p0.89) nor forage intake (p>0.24) were affected by reduced precipitation. It was conclude that the season can affect the balance and efficiency of nutrients in lactating cows mainly because management guidelines in the food supplement.

Palavras-chave : dry season; nutritional efficiency; rainy season.

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