Effect of stocking management and nitrogen supplementation on pasture milk yield

Dias,Rita Kelly Couto Brandão; Teixeira,Fábio Andrade; Fries,Daniela Deitos; Silva,Fabiano Ferreira da; Dias,Daniel Lucas Santos; Santos,Jeankarlo Penalva dos; Barreto,Fernando Oliveira; Rodrigues,Sinara Sales de Oliveira; Meneses,Murilo de Almeida

Effect of stocking management and nitrogen supplementation on pasture milk yield

2022

Abstract This study aimed to evaluate the effect of the first and last stocking strategies combined with a partial substitution of the protein from the supplement for urea nitrogen on nutrient intake and digestibility, milk composition, and nitrogen balance of primiparous Girolando cows. The cows were allocated to a double 4 × 4 Latin square composed of four animals and four treatments in a 2 × 2 factorial arrangement. Supplements were formulated to provide an intake of 0.6% body weight, with and without the inclusion of 21% urea nitrogen in their composition. The first stocking management method improved nutrient intake and digestibility. Supplementation with urea led to a 47% higher excretion of urine N (g/day) than the urea treatment. The combination of the supplement without urea and the first stocking provided higher intake and retention of nitrogen and higher retained-N levels (%digested N). The combination of a supplement containing 21% urea nitrogen and the first stocking can be used without compromising the nutritional and productive parameters of the cows.

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