Willis W L, Reid L
Department of Animal Sciences, North Carolina Agricultural and State University, Greensboro 27411, USA.
Poult Sci. 2008 Apr;87(4):606-11. doi: 10.3382/ps.2006-00458.
An experiment was conducted to investigate the effect of restricted feeding of a commercially available probiotic diet on production/processing performance, Campylobacter jejuni prevalence, and organ weights in broiler chickens. Five hundred forty 1-d-old broiler chicks were randomly assigned to a control or a direct-fed microbial (PrimaLac, DFM) diet and subjected to ad libitum full-fed (A), restricted 8-h (R), or skip-a-day (S) feeding regimens. Each of the 6 treatments was replicated 3 times with 15 male and 15 female chicks per pen for 49 d. Significant (P<0.05) differences between BW in the control and DFM groups with regard to feed type were found at d 7 (A), female d 21 (R) male and females, and d 49 (A and S) male and females. Body weights of males in the control group were significantly higher than the DFM (A) and differed by regimens (A>R>S) at d 49, whereas weights of females did not differ in regimens A and S. Body weight in the control females of regimen R was significantly higher than those in regimens A and S. Carcass yield was significantly higher for males in the control regimen A, 78.1 vs. 74.6% for the DFM regimen A; however, females did not differ significantly in this regimen, but did so in regimen S with 72.6 vs. 69.0%. The gizzard weights were significantly higher for broilers exposed to S and R regimens when compared with the A regimen. The prevalence of C. jejuni in the DFM-treated broilers regimen R was lower (33 vs. 60% positive) for the control group at 21 d. The weekly BW throughout the study reflected many variations, but broiler chickens receiving the control feed on regimen A performed better than those receiving the DFM feed. From the present results, it was concluded that supplementation of DFM reduced the presence of C. jejuni but had no significant effect on the growth performance of broilers; however, there were some significant trends regarding sex, feed, and feeding methods on the performance results.
进行了一项实验，以研究限制饲喂市售益生菌日粮对肉鸡生产/加工性能、空肠弯曲菌流行率和器官重量的影响。将540只1日龄的肉鸡雏鸡随机分配到对照日粮或直接饲喂微生物（PrimaLac，DFM）日粮组，并分别采用自由采食全量（A）、8小时限制采食（R）或隔日饲喂（S）的饲喂方案。6种处理方式各重复3次，每栏饲养15只雄性和15只雌性雏鸡，为期49天。在第7天（A组）、雌性第21天（R组）的雄性和雌性以及第49天（A组和S组）的雄性和雌性中，发现对照组和DFM组在体重方面因饲料类型存在显著（P<0.05）差异。对照组雄性的体重在第49天显著高于DFM组（A组），且因饲喂方案不同而有所差异（A>R>S），而雌性在A组和S组的体重没有差异。R组对照雌性的体重显著高于A组和S组。对照方案A组雄性的胴体产量显著更高，DFM方案A组为78.1%，而DFM方案A组为74.6%；然而，雌性在该方案中没有显著差异，但在S方案中存在显著差异，分别为72.6%和69.0%。与A方案相比，采用S和R方案的肉鸡肌胃重量显著更高。在21日龄时，DFM处理的肉鸡R方案中空肠弯曲菌的流行率低于对照组（阳性率分别为33%和60%）。整个研究期间每周的体重反映出许多变化，但采用A方案接受对照饲料的肉鸡比接受DFM饲料的肉鸡表现更好。根据目前的结果得出结论，补充DFM可降低空肠弯曲菌的存在，但对肉鸡的生长性能没有显著影响；然而，在性能结果方面，性别、饲料和饲喂方法存在一些显著趋势。
