RESUMO O objetivo do trabalho foi avaliar o desempenho e as características quantitativas de carcaça de suínos machos castrados e imunocastrados

-Two experiments were conducted to evaluate the evaporative cooling of the air at farrowing on the performance of lactating sows under high environmental temperature conditions in the Central West region of Brazil. One hundred and forty-four lactating sows -46 of first and second farrowing (experiment I) and 98 from the third to eighth farrowing (experiment II) -were used. Sows were distributed in experimental design of randomized blocks consisting of two rooms (with air cooling and control), with the sow as the experimental unit. The average duration of lactation was 21 days.Sows were fed ad libitum with the same lactation diet. In experiment I, the air cooling increased the daily feed intake, reduced the total and percent weight loss, increased the weight of the piglets and litters at weaning and improved the daily milk production of sows. However, the air cooling did not affect the weight of the sows or the number of piglets at weaning. In experiment II the air cooling increased the daily feed intake of the sows, reduced the total and percent weight loss, increased the weight and the weight gain of the piglets and litters and improved the daily milk production of the sows. Air cooling enables the increase of the daily feed intake and, therefore, of nutrients by the sows, with consequent reduction of mobilization of body reserves and the increase in the milk production and in the weight of piglets and litters at weaning, regardless the farrowing order of the sow.

Energia líquida e ractopamina para leitoas em terminação sob altas temperaturas ambientaisNet energy and ractopamine to finishing gilts under high temperature environment

O trabalho foi realizado com o objetivo de comparar o potencial do antibiótico e de um complexo homeopático sobre a prevenção e tratamento de diarréia em leitões lactentes, bem como comparar e avaliar os resultados de desempenho e mortalidade durante a fase de aleitamento. Foram utilizadas 98 leitegadas, em um total de 988 leitões, de matrizes com ordem média de 5,92 ± 2,65 partos. As leitegadas foram distribuídas em delineamento experimental de blocos ao acaso, composto pelos tratamentos controle, antibiótico e complexo homeopático. Adotou-se a ordem de parto das matrizes como critério de bloqueamento. No segundo dia de vida, as leitegadas foram submetidas à pesagem e aplicação, por via oral, de 2,0mL do antibiótico colistina ou 4,0mL de complexo homeopático por leitão. As leitegadas foram desmamadas com idade média de 22,97 ± 2,43 dias. Não houve efeito dos tratamentos sobre o desempenho e a mortalidade dos leitões. Foi constatada diferença quanto ao percentual de eficiência no tratamento de diarréia, o complexo homeopático apresentou eficiência superior em relação ao antibiótico (95,2% versus 90,0%). Concluiu-se que o complexo homeopático foi eficiente na prevenção e tratamento das diarréias dos leitões lactentes, e pode ser utilizado em substituição aos antibióticos.

This study proposes to undertake an economic assessment of the inclusion of different levels of distillers dried grains with solubles (DDGS) in diets for pigs in different production stages and categories (growing and finishing), namely: barrows fed diets containing 0 or 20% DDGS; and finishing barrows and sows fed diets containing 0, 10, 20, and 30% DDGS. A sensitivity analysis was performed on the price of corn in three simulated scenarios with different revenue systems: an optimistic scenario (lowest price); a regular scenario (medium price); and a pessimistic scenario (highest price). Inclusion of DDGS in the swine diet can reduce feeding costs and improve the profitability of production, about finishing males and females, the profit per kilogram of weight gain (US$/kg) were better in 10% of DDGS inclusion, 0.23, 0.28 respectively, but for growing and finishing, it was smaller in 20% (0.32 US$/kg) of DDGS inclusion than the 0% control treatment (0.33 US$/KG). The inclusion of DDGS must be carefully planned, since its use may depress animal performance and its inclusion is linked to the costs of the other ingredients that make up the diet.