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 Experiment
 Results
 Table 1 - Composition of experimental...
 Table 2 - Breed, sex and diet effects...














Group Title: Department of Animal Science research report - Florida Agricultural Experiment Station ; AL-1978-5
Title: Protein requirements of weanling foals consuming complete pelleted diets
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Permanent Link: http://ufdc.ufl.edu/UF00073101/00001
 Material Information
Title: Protein requirements of weanling foals consuming complete pelleted diets
Series Title: Department of Animal Science research report
Physical Description: 3 p. : ; 28 cm.
Language: English
Creator: Ott, E. A ( Edgar A )
University of Florida -- Dept. of Animal Science
University of Florida -- Agricultural Experiment Station
Publisher: Florida Agricultural Experiment Station
Place of Publication: Gainesville Fla
Publication Date: 1978
 Subjects
Subject: Foals -- Feeding and feeds -- Florida   ( lcsh )
Proteins in animal nutrition   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: E.A. Ott.
General Note: Caption title.
General Note: "September, 1978."
Funding: Animal science research report (University of Florida. Dept. of Animal Science) ;
 Record Information
Bibliographic ID: UF00073101
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 80552965

Table of Contents
    Experiment
        Page 1
    Results
        Page 1
    Table 1 - Composition of experimental diets
        Page 2
    Table 2 - Breed, sex and diet effects on weight, height and girth gains and feed consumption of weanling foals
        Page 3
Full Text

Department of Animal Science Florida Agr1icultural
Research Report AL-1978-5 Ek P nt S r y
September, 1978 GafefSile dra

SP E ; 1978
PROTEIN REQUIREMENTS OF WEANLING FOALS CONSUMING COMPLETE PELLETED DIETS

E. A. Ott.FA.S.- Univ. of Florida


The protein requirement of the weanling foal is estimated to be 2.3 g per
kg body weight (BW) (NRC, 1978), however, information on weanling Thoroughbred
and Quarter Horse foals is very limited. Determining protein requirements
necessitates that feed intake be accurately measured. An experiment was there-
fore designed to test three levels of protein in complete pelleted diets for
foals housed in drylots.

Experiment

Twenty three Thoroughbred and Quarter Horse foals, 12 fillies and 11 colts,
were weaned at 112 days of age. The foals were weighed, measured for height and
girth and randomly assigned within breed and sex subgroups to one of three treat-
ment groups. The foals were started on the experimental rations at an average
age of 116 days.

The pelleted experimental diets shown in table 1 were offered individually
for three one-hour periods each day. The remainder of the time the foals were
turned out into a drylot paddock providing 44.6 m2 of open space and 8.6 m2 of
covered area per foal when six foals were housed per lot. Lot groupings were by
age. No hay or forage was available to the foals other than that incorporated
into the pellets. Feed consumption was recorded daily and the foals were weighed
and measured for height and girth at weekly intervals.

Results

Feed consumption averaged 8.9 Ibs per head per day which was about 2.2 lbs
per 100 lb BW. This level of intake was less than expected. Weanling foals will
normally consume 2.5 to 3.0 lbs per 100 lb BW and sometimes even more. The rea-
son for the lowered feed consumption is not evident at this time. It may be due
to the diet form, ration palatability or limited access time (about 3 hrs per
day). Protein consumption averaged 562, 468 and 398 g per head per day or 2.7,
2.3 and 2.0 g per kg BW for the HR-27, HR-28 and HR-29 diets respectively.

Diet HR-29 resulted in less gain and poorer feed efficiency (P<.05) than
HR-27 or 28 (table 2). Thoroughbred foals were found to be higher at the withers
(P<.05) and consumed more feed (P<.05) and were less efficient (P<.05) than
Quarter Horses.

Regression analyses of weight, height and girth gains for the entire feed-
ing period indicate that regression equations for weight, height and girth were
different for all three rations (P<.05). Diet HR-27 thus gave the greatest
weight and girth gains and HR-28 gave the greatest height gain. Results suggest
that 2.3 g of crude protein per kg BW is inadequate to support maximum growth
and development. Thus, for a weanling foal a complete ration containing at
least 15.2% crude protein is recommended. Weanlings on pasture or receiving
Coastal Bermudagrass hay would require a grain ration containing 18% crude pro-
tein to get this level of protein.

1
Associate Professor of Animal Nutrition, Department of Animal Science,
Gainesville, Florida 32611.





Department of Animal Science Florida Agr1icultural
Research Report AL-1978-5 Ek P nt S r y
September, 1978 GafefSile dra

SP E ; 1978
PROTEIN REQUIREMENTS OF WEANLING FOALS CONSUMING COMPLETE PELLETED DIETS

E. A. Ott.FA.S.- Univ. of Florida


The protein requirement of the weanling foal is estimated to be 2.3 g per
kg body weight (BW) (NRC, 1978), however, information on weanling Thoroughbred
and Quarter Horse foals is very limited. Determining protein requirements
necessitates that feed intake be accurately measured. An experiment was there-
fore designed to test three levels of protein in complete pelleted diets for
foals housed in drylots.

Experiment

Twenty three Thoroughbred and Quarter Horse foals, 12 fillies and 11 colts,
were weaned at 112 days of age. The foals were weighed, measured for height and
girth and randomly assigned within breed and sex subgroups to one of three treat-
ment groups. The foals were started on the experimental rations at an average
age of 116 days.

The pelleted experimental diets shown in table 1 were offered individually
for three one-hour periods each day. The remainder of the time the foals were
turned out into a drylot paddock providing 44.6 m2 of open space and 8.6 m2 of
covered area per foal when six foals were housed per lot. Lot groupings were by
age. No hay or forage was available to the foals other than that incorporated
into the pellets. Feed consumption was recorded daily and the foals were weighed
and measured for height and girth at weekly intervals.

Results

Feed consumption averaged 8.9 Ibs per head per day which was about 2.2 lbs
per 100 lb BW. This level of intake was less than expected. Weanling foals will
normally consume 2.5 to 3.0 lbs per 100 lb BW and sometimes even more. The rea-
son for the lowered feed consumption is not evident at this time. It may be due
to the diet form, ration palatability or limited access time (about 3 hrs per
day). Protein consumption averaged 562, 468 and 398 g per head per day or 2.7,
2.3 and 2.0 g per kg BW for the HR-27, HR-28 and HR-29 diets respectively.

Diet HR-29 resulted in less gain and poorer feed efficiency (P<.05) than
HR-27 or 28 (table 2). Thoroughbred foals were found to be higher at the withers
(P<.05) and consumed more feed (P<.05) and were less efficient (P<.05) than
Quarter Horses.

Regression analyses of weight, height and girth gains for the entire feed-
ing period indicate that regression equations for weight, height and girth were
different for all three rations (P<.05). Diet HR-27 thus gave the greatest
weight and girth gains and HR-28 gave the greatest height gain. Results suggest
that 2.3 g of crude protein per kg BW is inadequate to support maximum growth
and development. Thus, for a weanling foal a complete ration containing at
least 15.2% crude protein is recommended. Weanlings on pasture or receiving
Coastal Bermudagrass hay would require a grain ration containing 18% crude pro-
tein to get this level of protein.

1
Associate Professor of Animal Nutrition, Department of Animal Science,
Gainesville, Florida 32611.

















Table 1. Composition of Experimental Diets1

Diets
Ingredients HR-27 HR-28 HR-29

Bermudagrass, coastal hay 30.00 30.00 30.00
Corn 40.75 48.00 55.00
Soybean meal 16.50 9.25 2.25
Wheat bran 5.00 5.00 5.00
Alfalfa, dehy 5.00 5.00 5.00
Limestone, gr 0.75 0.75 0.75
Bio phos 1.00 1.00 1.00
Salt 2 0.50 0.50 .50
Vitamin and Mineral Premix 0.50 0.50 .50

Analyses3
Digestible energy, Mcal/lb 1.33 1.33 1.34
Crude protein, % 15.2 13.0 11.8
Ether extract, % 3.7 4.4 4.5
Crude fiber, % 20.1 20.2 17.9
Ash, % 7.0 6.7 6.6
Calcium, % .63 .62 .63
Phosphorus, % .62 .63 .55

IDiets fed in pelleted form.
2Premix provided the following per lb of ration: manganese, 4.9
mg; iron, 18.2 mg; copper, 3.4 mg; zinc, 18.0 mg; cobalt, 0.1
mg; iodine, 0.1 mg; Vitamin A, 2000 USP; Vitamin D, 200 IU; and
Vitamin E, 5 IU.
3Dry matter basis.
'Calculated from NRC, 1973.












Table 2. Breed, Sex and Diet Effects on Weight, Height and
Girth Gains and Feed Consumption of Weanling Foals


Breed Sex Diet
T Q F C HR-27 HR-28 HR-29

Weight, lbs
Initial 396.1 369.1 388.4 376.8 381.5 377.0 389.3
Final 522.8 499.8 512.4 510.2 529.2 516.6 488.1
Gain 126.7 130.7 124.0 133.4 147.7a 139.6 98.8b

Height, in
Initial 49.34 47.04 48.29 48.09 48.03 48.38 48.16
Final 52.89 51.21 52.23 51.87 51.84 52.68 51.63
Gain 3.55 4.17 3.94 3.78 3.81 4.30 3.47

Girth, in
Initial 49.07 47.97 49.23 47.81 48.41 48.43 48.71
Final 54.01 52.76 53.95 52.81 54.33 53.40 52.41
Gain 4.94 4.79 4.72 5.00 5.92 4.97 3.70

Feed consumption, lbs
Total 1074a 910 974 1010 1029 1004 944
Per 100 lbs BW 2.34 2.1 2.16 2.29 2.2g 2.25 2.1i
Per lb gain 8.5a 7.0 7.9 7.6 7.0 7.2 9.6


abComparable values with unlike superscripts


are significantly different (P<.05).




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