RESUMO
In this study, we evaluated the effects of supplementation with peanut and sunflower oils on intake and digestibility, milk yield and composition, energy balance (EB), changes in weight and body condition score (BW and BCS), and blood metabolites of Jersey cows on pasture in early lactation. Twenty-four cows were distributed in a randomized block design where they received the following treatments: concentrate without oil (CON), concentrate plus 59.6 g/kg DM peanut oil (PEA), concentrate plus 59.6 g/kg DM sunflower oil (SUN), and concentrate plus 59.6 g/kg DM of a 1:1 mixture of peanut oil and sunflower oil (MIX). The data were analyzed at 30 and 60 days in milk (DIM). Oil supplementation did not affect total dry matter intake or forage intake. The treatment SUN reduced daily milk yield, 4% fat-corrected milk yield, and milk fat, while the other treatments generated similar results. The treatment SUN reduced the milk net energy and the use efficiency of the NEL for milk production and BW and BCS changes, and improved EB up to 60 DIM. On tropical pastures, supplementation with unsaturated oils for cows in early lactation does not result in better milk performance. The supplementation with sunflower oil improves the energy balance in early lactation.
Assuntos
Dieta/veterinária , Suplementos Nutricionais , Metabolismo Energético , Lactação/efeitos dos fármacos , Óleo de Amendoim/química , Óleo de Girassol/química , Criação de Animais Domésticos/métodos , Animais , Peso Corporal , Bovinos , Indústria de Laticínios/métodos , Feminino , Leite/metabolismoRESUMO
O objetivo deste trabalho foi estudar o efeito do balanco cátion-aniônico da dieta (BCAD) no balanco e concentracão sérica de cálcio em ovinos da raca Santa Inês. O delineamento experimental foi em blocos para controlar o efeito do peso inicial dos animais. Foram utilizados cinco tratamentos com níveis crescentes de BCAD (-160, -40, 140, 250 e 500mEq/kg de matéria seca) com cinco repeticões em 25 animais. O BCAD influencia o metabolismo de cálcio em ovinos machos da raca Santa Inês. Com a diminuicão do BCAD o cálcio sérico aumentou. Dietas aniônicas aumentaram a excrecão urinária de cálcio, entretanto a retencão não foi afetada.