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      Desempenho e características qualitativas da carcaça e da carne de cordeiros terminados em confinamento alimentados com dietas contendo soja grão ou gordura protegida Translated title: Performance and qualitative characteristics of carcasses and meat of lambs finished in confinement and fed diets containing soybean grain or protected fat

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          Abstract

          O objetivo foi avaliar o desempenho, as características das carcaças e a qualidade da carne de cordeiros Santa Inês, terminados em confinamento, alimentados com dietas contendo 60% de concentrado e enriquecidas com soja grão ou gordura protegida. Os concentrados foram compostos de farelo de soja, milho, farelo de trigo, ureia, núcleo mineral, soja grão ou gordura protegida. Como volumoso foi utilizado o feno de capim-tifton 85. Foram utilizados 24 cordeiros com aproximadamente 19,30 ± 1,77 kg e média de idade de 5 meses alojados em baias individuais por um período de 105 dias (21 de adaptação e 84 dias de período experimental). Os animais foram pesados ao início do experimento e a intervalos de 28 dias, com a finalidade de acompanhar o ganho de peso dos animais. Findo o experimento, foram abatidos para mensurações nas carcaças e avaliação das características quantitativas. Após o resfriamento das carcaças por 24 horas, foram retiradas amostras do lombo para análises da qualidade da carne. O delineamento experimental foi o inteiramente casualizado, com três tratamentos e oito repetições. Os animais que receberam a gordura protegida apresentaram maior ganho em peso (0,24 kg/dia). As dietas contendo soja grão ou gordura protegida proporcionaram melhor conversão alimentar (4,80 e 4,06 respectivamente). O enriquecimento da dieta com soja grão ou gordura protegida não promove diferenças significativas nas características de carcaça nem na qualidade da carne.

          Translated abstract

          The objective of this work was to evaluate performance, carcass traits and meat quality of Santa Inês lambs, finished in feedlot, fed diets containing 60% concentrate and enriched with soybean grain or with protected fat. The concentrates were composed with soybean meal, corn, wheat meal, urea, mineral mixture, soybean grain or protected fat. Tifton-85 hay was used as roughage. It was used 24 lambs with approximately 19.30 ± 1.77 kg and at average age of five months. The animals were housed in individual pens for a period of 105 days (21 days of adaptation and 84 days of experimental period). The animals were weighed at the beginning of the experimental period and at every 28-day interval aiming at following weight gains in the animals. When the experiment finished, the animals were slaughtered for measurements on carcasses and assassement of quantitative characteristics. After cooling carcasses for 24 hours, samples were taken from the loin for meat quality analysis. The experimental design was a completely randomized design with three treatments and eight replicates. Animals fed protected fed presented better feed conversion (4.80 and 4.06, respectively). Diets enriched with soybean grain or protected fat do not promote significant differences on carcass traits and meat quality neither.

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          Estatística Aplicada a Experimentação Animal

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            Effects of diet on short-term regulation of feed intake by lactating dairy cattle.

            M Allen (2000)
            Physical and chemical characteristics of dietary ingredients and their interactions can have a large effect on dry matter intake (DMI) of lactating cows. Physical limitations caused by distension of the reticulo-rumen or other compartments of the gastrointestinal tract often limit DMI of high producing cows or cows fed high forage diets. Fermentation acids also limit DMI from a combination of increased osmolality in the reticulo-rumen and specific effects of propionate, although the mechanisms are not clear. The specific physical and chemical characteristics of diets that can affect DMI include fiber content, ease of hydrolysis of starch and fiber, particle size, particle fragility, silage fermentation products, concentration and characteristics of fat, and the amount and ruminal degradation of protein. Site of starch digestion affects the form of metabolic fuel absorbed, which can affect DMI because absorbed propionate appears to be more hypophagic than lactate or absorbed glucose. Dry matter intake is likely determined by integration of signals in brain satiety centers. Difficulty in measurement and extensive interactions among the variables make it challenging to account for dietary effects when predicting DMI. However, a greater understanding of the mechanisms along with evaluation of animal responses to diet changes allows diet adjustments to be made to optimize DMI as well as to optimize allocation of diet ingredients to animals. This paper discusses some of the characteristics of dietary ingredients that should be considered when formulating diets for lactating dairy cows and when allocating feeds to different groups of animals on the farm.
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              Nutrient requirement of sheep

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbz
                Revista Brasileira de Zootecnia
                R. Bras. Zootec.
                Sociedade Brasileira de Zootecnia (Viçosa )
                1806-9290
                August 2011
                : 40
                : 8
                : 1822-1829
                Affiliations
                [1 ] Universidade Federal da Grande Dourados Brazil
                [2 ] Universidade Estadual Paulista Brazil
                [3 ] Universidade Federal da Grande Dourados Brazil
                Article
                S1516-35982011000800028
                10.1590/S1516-35982011000800028
                3a8e59b3-ef4d-4a1b-a2e6-ffb9c7fcc3a8

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

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-3598&lng=en
                Categories
                AGRICULTURE, DAIRY & ANIMAL SCIENCE
                VETERINARY SCIENCES

                Animal agriculture,General veterinary medicine
                average daily gain,carcass traits,loin eye area,sheep,tenderness,texture,área de olho-de-lombo,características de carcaça,ganho de peso diário,maciez,ovinos,textura

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