Energy balance in grazing Jersey cows in early lactation supplemented with peanut and sunflower oils
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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.
KeywordsFat Linoleic acid Blood metabolites Milk yield Oleic acid
The authors express their gratitude to the staff of the Universidade Estadual de Maringá (Maringá, Paraná, Brazil), Agência de Pesquisa em Tecnologia do Agronegócio, (Ribeirão Preto, São Paulo, Brazil), and Universidade de São Paulo (Pirassununga, São Paulo, Brazil) for their contribution to the present study. M.O.A. Rufino was recipient of a studentship from Conselho Nacional de Desenvolvimento Científico e Tecnológico − CNPq (Brasília, Federal District, Brazil).
Compliance with ethical standards
All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.
Conflict of interest
The authors declare that they have no conflict of interest.
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