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- Title
Apparent diet digestibility and morphometric measurements of ruminal papillae of water buffaloes finished in feedlot.
- Authors
Correa, H. L.; Meirelles, P. R. L.; Silva, F. M.; Silva, D. C. M.; Aranha, A. S.; Paschoa, M. A.; Narciso, M. H. M. P.; Longuini, A. A.; Luz, P. A. C.; Castilhos, A. M.; Francisco, C. L.; Jorge, A. M.
- Abstract
The objective of this study was to evaluate the relationship between parameters of apparent diet digestibility and morphometric measurements of ruminal papillae of water buffaloes (Bubalus bubalis) finished in feedlot. Sixty-five non-castrated males (BW and mean age of 314 ± 117 kg and 390 ± 58 d, respectively) were used. The animals were allocated in collective pens and received a diet based on corn silage (30%), milled grain (53.19%), cotton meal (12.99%), urea (0.76%), calcitic lime (0.75%), and mineral salt (2.24%). Diets were offered in an automatic feeder system (Intergado®, MG, Brazil) with ad libitum access. Animal DMI and ADG were recorded. In order to estimate the apparent digestibility of nutrients (DM, CP, NDF, ADF, TDN, and OM), fecal collection was used to calculate fecal excretion from the internal indigestible neutral detergent fiber marker (iNDF). A fragment (1 cm², approximately) of each rumen from cranial sac (atrium ruminis) was collected for the study of macroscopic morphological variables, such as number of papillae (NOP; n/cm² of rumen wall); papillae surface area (PSA; mm²); papillae width (W); papillae length (L); absorptive surface area (ASA; cm²/cm² of rumen wall) calculated as follows: [1 + (NOP × PSA) - (NOP × 0.002)]; and proportion of the papillae on absorptive surface (PPAS; %) calculated as follows: [(NOP × PSA/ASA) × 100]. Data were obtained from captures and analysis of the images by software (Image J, National Institutes of Health, Bethesda, MD, USA). Subsequently, data were analyzed with PROC CORR (SAS, Inst. Inc., Cary, NC). There were associations among the nutrient digestibilities (P < 0.05) with ASA, PPAS, and W, except to W and DigCP (P > 0.05). Relationships were observed (P < 0.05) among papillae length, ADG, and DMI. The relationship between papillary morphometric characteristics and nutrient digestibility illustrates the efficiency of water buffaloes in the utilization of the feed. Supported by FAPESP #2014/05473-7 and #2016/01109-4.
- Subjects
FEEDLOTS; FEED corn silage; WATER buffalo
- Publication
Journal of Animal Science, 2017, Vol 95, p74
- ISSN
0021-8812
- Publication type
Abstract
- DOI
10.2527/asasann.2017.151