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151
Apparent diet digestibility and morphometric measurements of ruminal papillae of water buffaloes finished in feedlot

Monday, July 10, 2017
Exhibit Hall (Baltimore Convention Center)
Hugo L. Correa, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
Paulo R.L. Meirelles, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
Fabiola M. Silva, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
Daiane C.M. Silva, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
Aline S. Aranha, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
Mariana A. Paschoa, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
Matheus H.M.P. Narciso, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
Aimê A. Longuini, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
Patricia A.C. Luz, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
André M. Castilhos, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
Caroline L. Francisco, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
André M. Jorge, Universidade Estadual Paulista - FMVZ, Botucatu, Brazil
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 pen 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%). Diet was offered into 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 nutrients digestibility (P < 0.05) with ASA, PPAS, and W, except to W and DigCP (P > 0.05). Relationship was observed (P< 0.05) among papillae length, ADG and DMI. The relationship between papillary morphometric characteristics and nutrients digestibility illustrates the efficiency of water buffaloes in the utilization of the feed. Supported by FAPESP #2014/05473-7 and #2016/01109-4.

 Table

NOP

PSA

ASA

PPAS

HEIGHT

WIDTH

LENGTH

DM digestibility

-0.14

-0.24**

-0.37*

-0.29*

-0.14

-0.29*

-0.09

CP digestibility

-0.15

-0.16

-0.32*

-0.27*

-0.12

-0.20

-0.06

NDF digestibility

-0.12

-0.23**

-0.35*

-0.32*

-0.13

-0.32*

-0.04

ADF digestibility

-0.07

-0.23**

-0.35*

-0.33*

-0.16

-0.28*

0.04

TDN digestibility

-0.10

-0.23**

-0.34*

-0.24*

-0.12

-0.29*

-0.08

OM digestibility

-0.13

-0.23**

-0.35*

-0.27*

-0.13

-0.29*

-0.13

ADG

-0,13

-0.06

-0.21**

-0.20

-0.12

0.01

0.29*

DMI

-0.11

-0.002

-0.08

-0.10

0.04

-0.09

0.48*

*P < 0.05 **P < 0.10