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Desempenho de vacas em lactação alimentadas com dietas contendo torta de macaúba Translated title: Performance of dairy cows fed diets containing macauba meal

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      Abstract

      Avaliaram-se o consumo de nutrientes e a produção e composição do leite de vacas da raça Holandesa alimentadas com dietas contendo diferentes quantidades de inclusão de torta de macaúba. Oito animais foram distribuídos em dois quadrados latinos 4x4, sendo quatro tratamentos, 0, 100, 200 e 300g kg-1 de TM na matéria seca da dieta, e quatro períodos experimentais de 21 dias, 14 de adaptação e sete de avaliações. A adição de quantidades crescentes de torta de macaúba à dieta alterou o consumo de matéria seca, matéria orgânica, proteína bruta, extrato etéreo, fibra em detergente neutro, carboidratos não fibrosos, produção e os teores de lactose, extrato seco desengordurado e sólidos totais do leite, bem como a eficiência alimentar e a digestibilidade da matéria seca. Por outro lado, não foi verificada diferença nos teores de gordura do leite. A adição da TM em até 300g kg-1 da dieta comprometeu o consumo e o desempenho produtivo dos animais.

      Translated abstract

      We evaluated nutrient intake, production and composition of milk from Holstein cows fed feedlot diets with different inclusion levels of macauba meal. Eight animals were divided into two 4x4 latin square designs, four treatments, 0, 100, 200 and 300g kg-1 macauba meal in the dry matter diet, and four experimental periods of 21 days, 14 adaptation and seven evaluation The addition of increasing levels of macauba meal diet alter the intake of dry matter, organic matter, crude protein, ether extract, neutral detergent fiber, non-fiber carbohydrates, production and concentration of lactose, nonfat dry and total solids in milk, as well as the feed efficiency and digestibility of dry matter. Moreover, there was no difference in the levels of milk fat. The addition of macaúba meal up to 300g kg-1 diet compromised the consumption and production performance of animals.

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      Nutritional ecology of the ruminnant

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        Predicting intake and digestibility using mathematical models of ruminal function.

        Intake and digestibility of feeds by ruminants are influenced by characteristics of the feed, animal and feeding situation. Integration of these characteristics in mathematical models is critical to future progress in forage evaluation and optimal formulation of diets for ruminants. The physiological and physical theories of intake regulation can be described by simple mathematical equations. These equations indicate that intake is a linear function of animal characteristics, such as body weight and production level, and a reciprocal function of feed characteristics, such as fill effect and energy content. Theoretical equations were developed to predict intake when the neutral detergent fiber and energy content of the diet and the energy requirements of the animal are known. The theoretical model also can be used to predict the maximum intake that will maintain a given level of animal production by solving the physiological and physical intake equations at their intersection. Psychogenic intake regulation, which is related to the animal's behavioral response to factors not related to physiological or physical characteristics, can be described mathematically as a multiplier. Digestibility can be predicted by summing the contents of ideal nutritive entities in feeds, which have true digestibilities near 100%, subtracting their associated endogenous losses and adding the variable digestible fiber content. Steady-state models indicate fractional rates of digestion and passage can be used to define ideal nutritive entities and predict digestibility over a range of kinetic characteristics. The steady-state solutions are particularly useful in understanding and predicting the depression in digestibility associated with changes in rates of passage at high levels of feed intake.
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          Nutrient requeriment of dairy cattle

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            Author and article information

            Affiliations
            [1 ] Universidade Federal de Minas Gerais Brazil
            [2 ] Universidade Federal de Minas Gerais Brazil
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Role: ND
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            Role: ND
            Journal
            abmvz
            Arquivo Brasileiro de Medicina Veterinária e Zootecnia
            Arq. Bras. Med. Vet. Zootec.
            Universidade Federal de Minas Gerais, Escola de Veterinária (Belo Horizonte )
            1678-4162
            February 2014
            : 66
            : 1
            : 211-218
            S0102-09352014000100029 10.1590/S0102-09352014000100029

            http://creativecommons.org/licenses/by/4.0/

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            Product Information: SciELO Brazil
            Categories
            VETERINARY SCIENCES

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