A dry matter intake (DMI) prediction equation was estimated by using a data file that contained 124 treatment means collected from published studies. Animal factors considered for inclusion in the prediction model were body weight (BW) and its natural logarithm, BW(0.75), milk yield (MY) and its natural logarithm, milk fat and protein yields, month of lactation and its square, as well as its natural logarithm. The dietary factors considered were the percentages of neutral detergent fiber, acid detergent fiber, crude protein and hemicellulose in the ration dry matter together with the square of all these predictors. The multiple regression model selected by using the maximum R2 method include both animal and dietary factors as independent variables. The accuracy of this DMI prediction equation was evaluated and compared with that of five other equations previously published by using three independent datasets also containing treatment means collected from literature. Even though the latest NRC equation was slightly more accurate than the equation proposed in this study with the three evaluation datasets, the latter can be used for some applications for which the NRC equation is not appropriate.

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4Embrapa Pecuária Sudeste ˗ São Carlos, SP RESUMO Objetivou-se estimar a associação fenotípica entre a eficiência alimentar e o ganho em acabamento de carcaça de touros jovens da raça Nelore. Utilizaram-se informações de 98 touros jovens da raça Nelore, participantes de duas provas de eficiência alimentar que empregaram o sistema de cochos eletrônicos Growsafe ® , as quais foram realizadas nos anos de 2015 e 2016, na fazenda Capim Branco, da Universidade Federal de Uberlândia. As provas de eficiência alimentar tiveram duração de 91 dias, sendo 21 dias de adaptação e 70 dias de avaliação. Os animais apresentavam idade média ao início e ao término do confinamento de 19,98 e 22,16 meses e peso inicial e final médio de 428,17 e 542,27kg, respectivamente. Verificou-se que os animais mais eficientes depositaram menos gordura, e os animais menos eficientes depositaram mais gordura durante o período de avaliação em confinamento. Observouse que há uma associação fenotípica de baixa magnitude (0,29) entre o consumo alimentar residual (CAR) e o ganho em acabamento de carcaça (GACAB). Assim, pode-se inferir que, ao serem selecionados menores valores de CAR, haverá alguma interferência negativa em GACAB. Concluiu-se que animais mais eficientes (CAR negativo) podem apresentar menor deposição de gordura subcutânea, influenciando na qualidade de carcaça de bovinos da raça Nelore. Palavras-chave: consumo alimentar residual, gordura subcutânea, bovinos de corte ABSTRACTThis study aimed to estimate the phenotypic association between feed efficiency and gain in carcass finishing of young Nelore bulls. Information from 98 young Nelore bulls participating in two feed efficiency tests using the Growsafe® electronic trough system, carried out in the years 2015 and 2016, at the Capim Branco farm of the Universidade Federal de Uberlândia was used .The feed efficiency tests lasted for 91 days, with 21 days of adaptation and 70 days of evaluation. The animals had a mean age at the beginning and end of the confinement of 19.98 and 22.16 months, and mean weight initial and end of 428.17 and 542.27kg, respectively. It was verified that most efficient animals deposited less fat, and the efficient animals deposited more fat during the evaluation period at the confinement. It was observed that there is a low magnitude phenotypic association (0.29) between the residual feed intake (RFI) and the gain in carcass finishing (GACAB). Thus, it can be inferred that by selecting lower values of residual feed intake there will be some negative interference in GACAB. It was concluded that the most efficient animals (negative RFI) may present lower deposition of subcutaneous fat, influencing the carcass quality of Nelore cattle.

INTRODUCCIÓN El hilo conductor de Ia pastoral, de Ia catequesis y de las celebraciones litúrgicas para este año 1997 es el propuesto por Juan Pablo II en su Carta apostólica «Tertio millennio adveniente» (TMA): este año, dice Ia carta, «se dedicará a Ia reflexión sobre Cristo, Verbo del Padre, hecho hombre por obra del Espíritu Santo» (TMA 40). Así Io ha puesto de relieve también Ia Conferencia Episcopal Española en su plan de acción pastoral para el cuatrienio 1997-2000 publicado bajo el lema «Proclamar el año de gracia del Señor» '. Se trata, pues, de penetrar en el misterio de Cristo, en su persona y en su obra. Por eso, junto con Ia invitación a conocer mejor a Jesucristo siguiendo el testimonio del evangelio de Marcos (ciclo B), se nos pide también una profundización teórica y práctica de los signos sacramentales a través de los cuales su obra, Ia obra de Ia salvación, se nos comunica 2. En concreto, «el esfuerzo de actualización sacramental l...l podrá ayudar, a Io largo del año, al descubrimiento del Bautismo como fundamento de Ia existencia cristiana» (TMA 41). Para situar este asunto, examinaremos primero algunos aspectos de Ia problemática actual en relación a Ia sacramentalidad,