鸡内源总能的变异及其对饲料原料真代谢能值的影响

本试验旨在研究试验鸡不同季节、不同批次间内源总能的变异及其对饲料原料真代谢能值的影响。试验采用单因素完全随机设计,分春季、夏季和秋季3个季节共计12个批次测定鸡内源总能及其对饲料原料[玉米、玉米干酒糟及其可溶物(DDGS)、木薯干和木薯渣]真代谢能值的影响,每个批次设4个重复,每个重复3只鸡。将各季节内各批次内源总能的平均值作为该季节内源总能,并根据不同季节的内源总能分别计算其对4种饲料原料真代谢能值的影响。结果表明:1)12个测定批次间48 h内源总能差异显著(P0.05),但3个季节内48 h内源总能差异均不显著(P0.05),因此,可将测定季节内各个批次间48 h内源总能数据合并,将其平均值作为该季48 h内源总能。2)对比3个季节间的48 h内源总能,秋季48 h内源总能(67.97 k J/只)极显著低于春季(83.07 k J/只)和夏季(79.90 k J/只)(P0.01),但春季和夏季间48 h内源总能差异不显著(P0.05)。3)季节内48 h内源总能与48 h内源干物质排泄量呈极显著正相关(r≥0.91,P0.01)。4)在玉米、玉米DDGS、木薯干及木薯渣4种饲料原料中,不同季节48 h内源总能的最大变化量分别占饲料总能排泄量的7.36%~8.38%、2.68%~2.94%、7.92%~10.86%和3.53%~3.96%,不同季节48 h内源总能的变异引起饲料原料真代谢能值的变化范围为0.28~0.36 k J/g。由此可见,鸡内源总能在季节间存在一定的变异,但是该变异对饲料原料真代谢能值的计算并无显著影响。

Variation of Gross Endogenous Energy and Its Effect on Value of Ture Metabolizable Energy of Feedstuffs in Roosters

This experiment was conducted to investigate the variation of gross endogenous energy ( GEE ) in different seasons and different batches of determination and its effect on the value of true metabolizable energy ( TME) of feedstuffs in roosters. The single?factor completely randomized design was used in the experiment, GEE of 12 batches in roosters was determined across the spring, summer and autumn, and its effect on the val?ue of TME of feedstuffs was studied with 4 replicates per batch and 3 birds per replicate. The feedstuffs con?tained 3 corn, 3 corn distillers dried grains ( DDGS) , 3 cassava slice and 3 cassava meal. The mean of GEE determined all batches in each season was used as the GEE of each season, and its effect of different seasons on the TME of 4 different feedstuffs was calculated. The results showed as follows:1) significant differences were observed on GEE in 48 hours among 12 batches ( P<0.05) , however, no significant differences were observed on GEE in 48 hours of different batches in the same season ( P>0.05) . Thus, the values of GEE in 48 hours of different batches in the same season can be merged for a mean as GEE in 48 hours in the season. 2) Contrasted GEE in 48 hours of 3 seasons, the GEE in 48 hours in autumn (67.97 kJ/bird) was significantly lower than that in spring (83.07 kJ/bird) and summer (79.90 kJ/bird) (P<0.01). However, there was no significant difference of GEE in 48 hours between spring and summer ( P>0.05) . 3) The GEE in 48 hours had extremely significant positive correlation with the endogenous dry matter excretion in 48 hours in the same season ( r≥0.91, P<0.01). 4) In 4 feedstuffs, the ratio of maximum variation of GEE in 48 hours to the excretion of feed gross energy in different seasons were 7.36% to 8.38%,2.68% to 2.94%,7.92% to 10.86% and 3.53%to 3.96% for corn, corn DDGS, cassava slice and cassava meal, respectively. The values of TME of feedstuffs were caused by the variation of GEE in 48 hours in different seasons were ranged from 0.28 to 0.36 kJ/g. In conclusion, there is a small variation of GEE in different seasons, but the variation has no significant effect on the TME of feedstuffs in roosters.