Effect of protein supplementation on yield and milk composition of F1 Holstein x Zebu cows kept in deferred pasture of brachiaria grass

Abstract

The objective of this study was to evaluate different supplementation strategies concentrated to F1 Holstein x Zebu lactating cows managed in deferred signal grass pasture on the yield and composition of milk and body weight gain. Thirty six F1 Holstein x Zebu cows with an average lactation period of 267 ± 10 days, mean body weight of 548 ± 19kg were used following a completely randomized design in a 4 x 5 factorial scheme, being four feeding strategies and five days under evaluation. The treatments consisted of four nutritional strategies: deferred pasture as a source of roughage without supplementation (PDSS); deferred pasture as a source of roughage with protein supplement offer (PDCS); deferred pasture supplemented with 15 kilos of corn silage (natural base) + 1,200 grams of protein supplement (PDSP) and corn silage (ad libitum) + 700 grams of protein supplement (SMP). There was no interaction (P> 0.05) between the nutritional plans and days under evaluation for any of the variables. It was found that cows fed SMP showed milk production 26.06% higher than the other nutritional plans (mean of 11.46kg/day). F1 Holstein/Zebu cows handled in deferred pasture in a traditional way supplemented with protein maintains milk yield.

Efecto de la suplementación a base de cascarilla de cacao (Theobroma cacao) sobre la producción y calidad composicional de la leche en vacas mestizas en pastoreo

“…Resultados similares son reportados porSilva et al (2017),Teixeira et al (2019) yLima et al (2021), quienes evidenciaron un aumento de la producción de leche con el suministro de diferentes tipos de suplementos energético-proteicos en vacas de leche, en condiciones tropicales.En este estudio se veri có la interacción [p < 0,05] entre los tratamientos y los tiempos de colecta sobre la concentración de grasa, proteína, sólidos no grasos, minerales, sólidos grasos y densidad de la leche[Tabla 4]. El estudio de este efecto indica que la concentración de grasa [Figura 1], proteína [Figura 2], sólidos no grasos [Figura 5], sólidos totales [Figura 6] y densidad de la leche [Figura 7] solo aumentaron con el suministro del suplemento a base de cascarilla de cacao.…”