Studies on the Length of Preliminary and Collection Periods in Digestion Trials with Pigs

Abstract

The present experiment was conducted to investigate the optimum length of the preliminary and collection periods in digestion trials by the conventional total collection method with pigs.Eight Landrace barrows weighing 45 to 54kg at the beginning of the experiment were used.Each pig was kept in a metabolism cage throughout the experiment. Rations consisted of the following 3 diets; A, commercial diet for young pigs, B, diet generally used for the performance test for meat production in Japan and C, diet B with 20% beet-pulp.The pigs were divided into two groups; pigs of one group were given diets A, B and C for 10, 14 and 14 days, respectively, and pigs of the other group were given diets A, C and B for 10, 14 and 14 days, respectively, in serial order. The pigs were given 35g/kg body-weight of either diet A or diet B, or 30g/kg body-weight of diet C per day. Feces were collected quantitatively during the last 32 days (days 7-38).The components in the feces attained a steady state within 3 to 4 days after the ration was replaced. This suggests that at least 4 days are necessary for a preliminary feeding period. The coefficients of variation of apparent digestibility for each component after 4 days preliminary feeding period decreased with lengthening collection period. The decreas in the coefficient was great during the first 3 to 4 days, but slight after that. These results indicate that 4 days are necessary for the preliminary and collection periods in the digestion trials by the total collection method. Jpn.

Suplementación de aminoácidos esenciales en dietas de bajo nivel proteico para lechones: Revisión

“…Ensaios de digestibilidade com suínos em crescimento foram realizados por Sugimoto and Furuya (1983) O método da coleta total, apesar de proporcionar bons resultados, tem apresentado alguns problemas. Um dos principais problemas é obtenção de uma amostra representativa das fezes, urina ou excretas para posteriores análises, principalmente em virtude da contaminação com a ração, pelas penas, descamação da pele e perda de excreta durante a coleta.…”