Digestibility of triple recleaned northern oats and Florida 502 oats by horses

Material Information

Digestibility of triple recleaned northern oats and Florida 502 oats by horses
Series Title:
Department of Animal Science research report ;
Ott, E. A ( Edgar A )
Barnett, Ronald David, 1943-
University of Florida -- Dept. of Animal Science
University of Florida -- Agricultural Experiment Station
Place of Publication:
Gainesville, Fla
Florida Agricultural Experiment Station
Copyright Date:
Physical Description:
4 leaves : ; 28 cm.


Subjects / Keywords:
Horses -- Feeding and feeds -- Florida ( lcsh )
Oats as feed -- Florida ( lcsh )
City of Quincy ( local )
City of Marianna ( local )
Oats ( jstor )
Digestion ( jstor )
Cleaning ( jstor )
government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )


General Note:
Caption title.
General Note:
"June, 1984."
Statement of Responsibility:
E.A. Ott and R.D. Barnett.

Record Information

Source Institution:
University of Florida
Holding Location:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
82192463 ( oclc )


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Full Text

Department of Animal Science Florida Agricultural
Research Report AL-1984-11 Experiment Station
June, 1984 Gainesville, Florida


E. A. Ott and R. D. Barnett

Florida 502 is a new variety of oats selected for its adaption to
Florida's environment and its resistance to rust. It is productive in
north Florida and provides an excellent alternative to other feed grains.
Florida 502 oats are somewhat smaller than northern oats but have a high
groat to hull ratio giving them a high bushel weight. The oat hulls are
also somewhat darker than northern oats due to hull pigmentation. The
purpose of this study was to evaluate the acceptability and digestibility
of Florida 502 oats by horses.

Materials and Methods

Florida 502 oats grown on the Florida Foundation Seed Producers, Inc. farm
at Greenwood, Florida were cleaned and shipped to the University of
Florida campus for use in a horse digestion study. Northern triple
recleaned (TRC) oats were purchased locally for comparison. The oats were
shipped and stored in bags until fed.

Four Thoroughbred and Quarter Horse type geldings were used in a three
phase digestion study to compare the digestibility of the two oat
varieties. In phase 1 all horses received Alecia Bermudagrass hay at a
rate of 2 lb/100 lb BW. In phase 2, two of the horses received 1 lb/100
lb BW of northern TRC oats and two of the horses received 1 lb/100 lb BW
of Florida 502 oats. All four horses also received 1 lb/100 lb BW of
Alecia Bermudagrass hay. In phase 3, the animals were reversed. Each
phase of the experiment included a 14-day preliminary period and a 7-day
collection period. Total fecal excretion was collected during the last 5
days of each phase. Five percent of the excretion was collected each day
and frozen until the end of the trial. At the end of the experiment, the
fecal samples were thawed, combined, subsampled, dried and analyzed for
dry matter (DM), ash, acid detergent fiber (ADF), crude fiber (CF), crude
protein (CP), calcium (Ca), phosphorous (P) and gross energy (GE).


The Alecia Bermudagrass hay fed in this trial was somewhat lower in
protein than expected but other components were typical (table 1). The
northern oats were also somewhat lower in protein than expected based on
NRC (1978) values and the Florida 502 oats were even lower. Other values
for the oats were within expected ranges. Test weight on the northern and
Florida 502 oats were 40.7 and 38.7 lb/bu, respectively. Both varieties
of oats were readily accepted by the horses and little or no wastage

Apparent digestibilities of the three diets Alecia Bermudagrass hay,
hay plus northern oats and hay plus Florida 502 oats are shown in table
2. Dry matter and gross energy digestibility of the Alecia Bermudagrass
hay was somewhat lower than expected but other values were typical of
Bermudagrass hays (NRC 1978). The negative P digestion often occurs in
this type of short term trial.

The northern oats + Alecia Bermudagrass hay diet was digested to the
extent expected. The gross energy digestion of 49.54% resulted in a
digestible energy (DE) content of the diet of 2.09 Mcal/kg. The Florida
502 oats + Alecia Bermudagrass hay diet had higher DM and GE digestibility
and lower CP digestibility than the northern oat-based diet. The GE
digestibility was 52.70% resulting in a DE content of the diet of 2.24

The digestibility of the oats fractions of the two diets were
calculated by difference. The northern oats had DM, CP and GE
digestibilities of 64.5, 82.5 and 60.0%, respectively. Florida 502 oats
had DM, CP and GE digestibilities of 70.5, 80.2 and 66.9%, respectively.
The DE content of the northern and Florida 502 oats were, respectively,
2.66 and 2.98 Mcal/kg. These values are below the 3.34 Mcal/kg value used
by the NRC (1978). The values obtained in this study are comparable to
the 2.69 and 2.72 Meal DE/kg reported by Nevill (1978) for light and heavy
oats, respectively.

In this study Florida 502 oats were found to be very acceptable to
horses. Dry matter digestibility for the 502 oats was 6% higher than the
TRC oats and energy digestibility was 6.9% higher than TRC oats. The
calculated DE value for the 502 oats was 12% higher than the DE values for
the TRC oats. These differences were probably due to the lower
portion of hull present in the 502 oats as indicated by the lower crude
fiber level. Crude protein digestibility was only slightly (2.3%)
lower for the 502 oats suggesting that the feeding value of the Florida
produced oats were comparable, to if not better than, the northern oats.

A separate set of oat samples collected from the 1984 crop at the
Quincy and Marianna stations were analyzed for nutrient content. These
were field run samples and had not been recleaned. Bushel weight on these
samples ranged from a low of 29.0 lb/bu to 37.0 lb/bu (table 3). The
correlation between bushel weight and crude fiber content of the oats gave
an r value of -.86 suggesting that the bushel weight is closely related to
the amount of fiber and consequently the amount of hulls in the sample.
Protein levels for the 502 oats ranged from 9.20 to 12.68%. The fiber
levels ranged from 9.05 to 10.91% and were lower than the other two
varieties tested but considerably higher than the cleaned oats used in the
digestion study.

The results of this study indicate that Florida 502 oats are
comparable if not superior in nutrient value to northern TRC oats. The
darker hulls are of little consequence to the animal. However,
appropriate cleaning procedures similar to those used on the northern oats
are necessary to increase the bushel weight and make them acceptable to
most horse owners.

Table 1. Analysis of triple recleaned northern oats, Florida 502 oats and Alecia Bermudagrass hay

Dry Crude Acid det. Crude Pnos- Gross
matter protein1 fiber1 fiber1 Ash1 Calcium1 phorous1 energy1


Northern oats TRC 87.56 10.17 11.80 9.96 3.10 .11 .34 4.429

Florida 502 oats 87.41 9.15 8.60 6.96 1.98 .11 .31 4.446

Coastal Bermudagrass hay 86.59 8.35 32.06 29.14 4.92 .38 .25 4.059

1Dry matter basis

Table 2. Apparent digestibility of triple recleaned northern oats, Florida 502 oats and Alecia Bermucagrass
hay by horses

Dry Crude Acid det. Crude Pnos- Gross
matter protein fiber fiber Ash Calcium phorous energy

Coastal Bermudagrass hay 45.39 53.28 33.60 42.15 35.02 30.45 -9.20 37.86

Coastal Bermudagrass hay
plus northern oats 55.12 69.26 20.12 30.33 15.62 19.43 1.59 49.54

Coastal Bermudagrass hay
plus Florida 502 oats 57.74 67.98 20.98 31.56 4.48 23.68 -2.28 52.70

Table 3. Influence of variety and source of Florida produced oats on bushel weight and nutrient

Bushel Dry Crude Crude Fat2 Ash2 Calcium2 Phos.2
Variety Source Weight Matter Protein2 Fiber2
lb/bu % % % % % % %

Florida 501 Quincy 34.5 89.13 12.19 11.38 5.12 2.68 .04 .30

Florida 501 Marianna 33.0 89.69 8.69 12.88 5.31 2.14 .04 .32

Florida 502 Quincy 37.0 89.34 12.68 9.05 3.57 2.28 .03 .32

Florida 502 Marianna 35.0 89.39 11.18 9.97 3.67 2.08 .04 .36
Lot 5A-59

Florida 502 Marianna 34.5 88.59 9.20 10.91 3.73 1.92 .03 .31
Lot 3A-54

Brooks Quincy 29.0 89.33 12.83 12.94 5.95 2.64 .05 .30

11984 crop

2Dry matter basis